CN102628955B - Method for acquiring earthquake early warning magnitude - Google Patents
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Abstract
The invention discloses a method for acquiring earthquake early warning magnitude, and the objective of the invention is to provide a novel method combining two earthquake early warning magnitude acquisition means of prediction and actual measurement to overcome shortcomings of existing early warning magnitude calculation methods. The technical scheme of the invention is that the method comprises the following steps: 1 P waves and S waves of earthquake are acquired by using a plurality of earthquake wave acquisition stations which are close to the epicenter; 2 feature information of first n seconds of the earthquake waves acquired by each of the earthquake wave acquisition stations after the earthquake is extracted, and earthquake early warning magnitude of each of the stations is calculated by using an earthquake magnitude prediction formula; 3 earthquake magnitude of each of the stations is calculated by using an actual measurement formula; 4 if the earthquake magnitude of one station calculated by using the earthquake magnitude actual measurement formula is greater than the earthquake early warning magnitude calculated by using the earthquake magnitude prediction formula or the end of the earthquake waves is monitored by the station, then the earthquake magnitude calculated by using the earthquake magnitude actual measurement formula is selected as the earthquake early warning magnitude for the station; otherwise the predicted earthquake magnitude is selected as the early warning magnitude; 5 the average value of the earthquake early warning magnitude of each of the earthquake wave acquisition stations is selected as comprehensive earthquake early warning magnitude of the earthquake early warning.
Description
Technical field
The present invention relates to earthquake pre-warning technology, especially a kind of acquisition methods of earthquake pre-warning earthquake magnitude.
Background technology
Earthquake pre-warning (also can be described as the urgent speed report of earthquake, such as, in Japan) refers to after earthquake occurs, and before getting the jump on seismic wave propagation to fortified defence area, within several seconds in advance, gives the alarm to tens of second to fortified defence area, to reduce local loss.After earthquake occurs, P Bob S velocity of wave propagation is fast, and comparatively S ripple arrives fortified defence area faster.
In prior art; usually in the more incident area of earthquake, some seismic events can be installed in advance and detect the station; the P ripple collected, S ripple are sent to earthquake pre-warning server (or being called warning center, early warning publisher server) by seismic event monitor station standing-meeting in real time after the earthquake, and earthquake pre-warning server calculates this magnitude of earthquake by extraction P ripple, S ripple information.
The earthquake pre-warning magnitude calculation formula that this area exists at present is predictor formula.
Wherein predictor formula can be, but not limited to be
or
calculate magnitude of earthquake, wherein
for magnitude of earthquake,
for the peak displacement of former seconds after the earthquake P ripples,
for epicentral distance,
for the eigenperiod of former seconds after the earthquake P ripples.
The principle of magnitude of earthquake predictor method obtains predictor formula according to historical seismic wave waveform by statistics, the reaction of this predictor formula be statistical relationship between P-wave first motion feature (being in general the waveform character of first 3 seconds) and magnitude of earthquake.Owing to always there is individual difference, the result that predictor formula calculates is always large than the result error of actual measurement formulae discovery.
In addition, earthquake terminate after for calculate the formula of magnitude of earthquake be earthquake magnitude actual measurement formula.Actual measurement formula can be, but not limited to body wave magnitude computing formula
, wherein
for magnitude of earthquake,
be motion displacement, its value is the arithmetic mean of two levels to maximum motion displacement;
for epicentral distance,
for calibration functions, calibration functions is when measuring earthquake magnitude with particle movement maximum amplitude in different epicentral distance observation station, because of the corrected value that seismic event must add with range attenuation, its numerical value is equivalent to the earthquake magnitude value recording sympathetic earthquakes when particle movement speed is 1 μm/s over this distance.Actual measurement formula is after earthquake is calmed down, and for calculating the formula of magnitude of earthquake, is also the magnitude calculation formula that seismological department is applied now.
Summary of the invention
The deficiency that the object of the invention is to exist for existing early warning Magnitude Computing Method provides a kind of new earthquake pre-warning earthquake magnitude acquisition methods, it should be noted that, surveying formula in prior art is just be applied to magnitude calculation after earthquake is calmed down, and in the present invention, this formula is by before the calming down for earthquake of novelty.Concrete steps are as follows:
The earthquake pre-warning earthquake magnitude acquisition methods that the present invention proposes, comprises the following steps:
Step 1: utilize the P ripple and S ripple that locality shake from the some seismic events collection stations close to earthquake centre;
Step 2: extract each seismic event after the earthquake and gather the characteristic information of front n seismic event second that the station gathers, and utilize magnitude of earthquake predictor formula to calculate magnitude of earthquake;
Step 3: utilize magnitude of earthquake to survey formulae discovery magnitude of earthquake;
Step 4: judge the earthquake magnitude whether earthquake magnitude that each seismic wave gathers the magnitude of earthquake actual measurement formulae discovery of the station is greater than magnitude of earthquake predictor formula and calculates: if the earthquake magnitude of the magnitude of earthquake actual measurement formulae discovery at certain seismic event picking platform station is comparatively large or this seismic event gathers the station and monitors seismic event and calm down, then the earthquake magnitude of magnitude of earthquake being surveyed formulae discovery gathers the earthquake pre-warning earthquake magnitude of the station as this seismic event; Otherwise the earthquake magnitude calculated by magnitude of earthquake predictor formula gathers the earthquake pre-warning earthquake magnitude of the station as this seismic event;
Step 5: the earthquake pre-warning earthquake magnitude at each seismic event picking platform station is averaged; The comprehensive earthquake pre-warning earthquake magnitude of described mean value secondary earthquake early warning for this reason.
Preferably, calculating the method that earthquake pre-warning earthquake magnitude that various places seismic waves gathers the station averages in step 5 is: directly ask arithmetic average to the earthquake pre-warning earthquake magnitude at each seismic event picking platform station or first calculate the variance of earthquake pre-warning earthquake magnitude at each seismic event picking platform station, then remove the earthquake pre-warning earthquake magnitude being greater than 2 times or 3 times variances, finally remaining earthquake pre-warning earthquake magnitude is averaged.
Preferably, gathering station place at seismic event adopts strong-motion instrument or acceleration transducer to gather seismic signal.
Preferably, in described step 2, predictor formula is
or
calculate magnitude of earthquake, wherein
for magnitude of earthquake,
for the peak displacement of n P second ripple before after the earthquake,
for epicentral distance,
for the eigenperiod of n P second ripple before after the earthquake;
In described step 3, described actual measurement formula is
, wherein
for magnitude of earthquake,
be motion displacement, its value is that the seismic shock acceleration that collects of described strong-motion instrument or acceleration transducer, from earthquake, the quadratic integral in moment to current seismic magnitude calculation moment occurs;
for epicentral distance,
for calibration functions.
Preferably, utilize in described step 1 from the some seismic events within the kilometer range of earthquake centre 40 gather the stations locality shake occur after before the P ripple of n second and S ripple.
Preferably, described n is 3.
The invention allows for another kind of earthquake pre-warning earthquake magnitude acquisition methods, comprise the following steps: step 1: utilize the P ripple and S ripple that locality shake from the some seismic events collection stations in the kilometer range of earthquake centre 45;
Step 2: extract seismic event after the earthquake and gather the characteristic information in front n seismic event second of station collection, and utilize magnitude of earthquake predictor formula to calculate magnitude of earthquake;
Step 3: utilize magnitude of earthquake to survey formulae discovery magnitude of earthquake;
Step 4: judge seismic waveshape whether peak value to have crossed or seismic event is calmed down: if certain seismic event picking platform station detects that seismic event peak value has been crossed or seismic event is calmed down, then the earthquake magnitude of magnitude of earthquake being surveyed formulae discovery gathers the earthquake pre-warning earthquake magnitude of the station as this seismic event; Otherwise the earthquake magnitude calculated by magnitude of earthquake predictor formula gathers the earthquake pre-warning earthquake magnitude of the station as this seismic event;
Step 5: the earthquake pre-warning earthquake magnitude at each seismic event picking platform station is averaged; The comprehensive earthquake pre-warning earthquake magnitude of described mean value secondary earthquake early warning for this reason.
Preferably, calculating the method that earthquake pre-warning earthquake magnitude that various places seismic waves gathers the station averages in step 5 is: directly ask arithmetic average to the earthquake pre-warning earthquake magnitude at each seismic event picking platform station or first calculate the variance of earthquake pre-warning earthquake magnitude at each seismic event picking platform station, then remove the earthquake pre-warning earthquake magnitude being greater than 2 times or 3 times variances, finally remaining earthquake pre-warning earthquake magnitude is averaged.
Preferably, gathering station place at seismic event adopts strong-motion instrument or acceleration transducer to gather seismic signal; Described n is 3.
Preferably, in described step 2, predictor formula is
or
calculate magnitude of earthquake, wherein
for magnitude of earthquake,
for the peak displacement of first 3 seconds P ripples after the earthquake,
for epicentral distance,
for the eigenperiod of first 3 seconds P ripples after the earthquake;
In described step 3, described actual measurement formula is
, wherein
for magnitude of earthquake,
be motion displacement, its value is that the seismic shock acceleration that collects of described strong-motion instrument or acceleration transducer, from earthquake, the quadratic integral in moment to current seismic magnitude calculation moment occurs;
for epicentral distance,
for calibration functions.
Last the present invention proposes a kind of earthquake pre-warning earthquake magnitude acquisition methods, comprises the following steps:
Step 1: utilize the P ripple and S ripple that locality shake from the some seismic events collection stations close to earthquake centre;
Step 2: extract each seismic event after the earthquake and gather the characteristic information in front n seismic event second of station collection, and utilize magnitude of earthquake predictor formula to calculate magnitude of earthquake;
Step 3: utilize magnitude of earthquake to survey formulae discovery magnitude of earthquake;
Step 4: judge the earthquake magnitude whether earthquake magnitude that each seismic event gathers the magnitude of earthquake actual measurement formulae discovery of the station is greater than magnitude of earthquake predictor formula and calculates: if the earthquake magnitude of the magnitude of earthquake actual measurement formulae discovery at certain seismic event picking platform station is comparatively large or this seismic event gathers the station and monitors seismic event and calm down, then the earthquake magnitude of magnitude of earthquake being surveyed formulae discovery gathers the earthquake pre-warning earthquake magnitude of the station as this seismic event; Otherwise judge that this seismic event gathers the seismic waveshape whether peak value mistake of the station: if peak value mistake, then the earthquake magnitude of magnitude of earthquake being surveyed formulae discovery gathers the earthquake pre-warning earthquake magnitude of the station as this seismic event; Otherwise the earthquake magnitude calculated by magnitude of earthquake predictor formula gathers the earthquake pre-warning earthquake magnitude of the station as this seismic event;
Step 5: the earthquake pre-warning earthquake magnitude at each seismic event picking platform station is averaged; The comprehensive earthquake pre-warning earthquake magnitude of described mean value secondary earthquake early warning for this reason.
Preferably, calculating the method that earthquake pre-warning earthquake magnitude that various places seismic waves gathers the station averages in step 5 is: directly ask arithmetic average to the earthquake pre-warning earthquake magnitude at each seismic event picking platform station or first calculate the variance of earthquake pre-warning earthquake magnitude at each seismic event picking platform station, then remove the earthquake pre-warning earthquake magnitude being greater than 2 times or 3 times variances, finally remaining earthquake pre-warning earthquake magnitude is averaged.
Preferably, described n is 3, and gathers station place employing strong-motion instrument collection seismic signal at seismic event.
Above-mentioned epicentral distance
be the distance that the liftoff seismic wave in earthquake centre gathers the station.
In sum, owing to have employed technique scheme, the invention has the beneficial effects as follows:
Earthquake magnitude acquisition methods disclosed by the invention means uses measurement method calculate earthquake magnitude estimating, and can obtain magnitude of earthquake more accurately.
Adopt strong-motion instrument or acceleration transducer locality seismic wave, effectively prevent in prior art and cause because magnitude of earthquake is excessive sseismograph saturated, further ensure that the precision of the earthquake pre-warning magnitude calculation when violent earthquake occurs.
Traditionally, the measurement method of magnitude of earthquake waits earthquake to terminate the rear peak displacement of seismic waveshape or the speed of utilizing to calculate.And the measurement method adopted in the present invention proposes in early-warning parameters computation process, with the peak displacement measured or velocity estimation early warning earthquake magnitude, the early warning earthquake magnitude in the present invention is called as earthquake pre-warning earthquake magnitude measured value.The measurement method adopted in the present invention need not wait until that earthquake just can calculate earthquake magnitude after terminating, and has better ageing relative to existing earthquake measurement method.Meanwhile, at the initial stage of early warning magnitude calculation, what utilize P-wave estimates early warning earthquake magnitude, is conducive to earthquake pre-warning earthquake magnitude and rapidly converges to end value.
Embodiment
All features disclosed in this instructions, or the step in disclosed all methods or process, except mutually exclusive feature and/or step, all can combine by any way.
Arbitrary feature disclosed in this instructions (comprising any accessory claim, summary), unless specifically stated otherwise, all can be replaced by other equivalences or the alternative features with similar object.That is, unless specifically stated otherwise, each feature is an example in a series of equivalence or similar characteristics.
Earthquake pre-warning earthquake magnitude acquisition methods disclosed by the invention is estimated of the prior art and surveyed two kinds of methods obtaining magnitude of earthquake and organically combine.
Embodiment 1: a kind of earthquake pre-warning earthquake magnitude acquisition methods, comprises the following steps:
Step 1: utilize from several within the kilometer range of earthquake centre 45, such as 1 ~ 6, the P ripple that the seismic event collection station is locality shaken and S ripple;
Step 2: extract each seismic event after the earthquake and gather the characteristic information of the first 3 seconds P ripples that the station gathers; And utilize magnitude of earthquake predictor formula
calculate magnitude of earthquake, wherein
for magnitude of earthquake,
for the peak displacement of first 3 seconds P ripples after the earthquake,
for epicentral distance;
Step 3: utilize magnitude of earthquake to survey formula
calculate magnitude of earthquake, wherein
for magnitude of earthquake,
be motion displacement, its value is that the seismic shock acceleration that collects of described strong-motion instrument or acceleration transducer, from earthquake, the quadratic integral in moment to current seismic magnitude calculation moment occurs;
for epicentral distance,
for calibration functions;
Step 4: judge the earthquake magnitude whether earthquake magnitude that each seismic event gathers the magnitude of earthquake actual measurement formulae discovery of the station is greater than magnitude of earthquake predictor formula and calculates: if the earthquake magnitude of the magnitude of earthquake actual measurement formulae discovery at certain seismic event picking platform station is comparatively large or this seismic event gathers the station and monitors seismic event and calm down, then the earthquake magnitude of magnitude of earthquake being surveyed formulae discovery gathers the earthquake pre-warning earthquake magnitude of the station as this seismic event; Otherwise the earthquake magnitude calculated by magnitude of earthquake predictor formula gathers the earthquake pre-warning earthquake magnitude of the station as this seismic event;
Step 5: arithmetic average is asked to the earthquake pre-warning earthquake magnitude at each seismic event picking platform station, the comprehensive earthquake pre-warning earthquake magnitude of described arithmetic average secondary earthquake early warning for this reason.
Embodiment 2:
A kind of earthquake pre-warning earthquake magnitude acquisition methods, comprises the following steps:
Step 1: utilize from several within the kilometer range of earthquake centre 45, such as, 1 ~ 6, seismic event gathers P ripple and the S ripple that station strong-motion instrument gathers earthquake;
Step 2: extract each seismic event after the earthquake and gather the characteristic information of the first 4 seconds P ripples that the station gathers; And utilize magnitude of earthquake predictor formula
calculate magnitude of earthquake,
for the eigenperiod of first 4 seconds P ripples after the earthquake;
Step 3: utilize magnitude of earthquake to survey formula
calculate magnitude of earthquake, wherein
for magnitude of earthquake,
be motion displacement, its value is that the seismic shock acceleration that collects of described strong-motion instrument or acceleration transducer, from earthquake, the quadratic integral in moment to current seismic magnitude calculation moment occurs;
for epicentral distance,
for calibration functions;
Step 4: judge the earthquake magnitude whether earthquake magnitude that each seismic event gathers the magnitude of earthquake actual measurement formulae discovery of the station is greater than magnitude of earthquake predictor formula and calculates: if the earthquake magnitude of the magnitude of earthquake actual measurement formulae discovery at certain seismic event picking platform station is comparatively large or this seismic event gathers the station and monitors seismic event and calm down, then the earthquake magnitude of magnitude of earthquake being surveyed formulae discovery gathers the earthquake pre-warning earthquake magnitude of the station as this seismic event; Otherwise the earthquake magnitude calculated by magnitude of earthquake predictor formula gathers the earthquake pre-warning earthquake magnitude of the station as this seismic event;
Step 5: the earthquake pre-warning earthquake magnitude at each seismic event picking platform station is averaged, the comprehensive earthquake pre-warning earthquake magnitude of described mean value secondary earthquake early warning for this reason.
Embodiment 3:
A kind of earthquake pre-warning earthquake magnitude acquisition methods, comprises the following steps: utilize and gather from 1 ~ 6 tableland seismic wave within the kilometer range of earthquake centre 45 P ripple and the S ripple that station strong-motion instrument gathers earthquake;
Step 2: extract each seismic event after the earthquake and gather the characteristic information in first 5 seconds P ripples of station collection; And utilize magnitude of earthquake predictor formula
or
calculate magnitude of earthquake, wherein
for magnitude of earthquake,
for the peak displacement of first 5 seconds P ripples after the earthquake,
for epicentral distance,
for the eigenperiod of first 5 seconds P ripples after the earthquake;
Step 3: utilize magnitude of earthquake to survey formula
calculate magnitude of earthquake, wherein
for magnitude of earthquake,
be motion displacement, its value is that the seismic shock acceleration that collects of described strong-motion instrument or acceleration transducer, from earthquake, the quadratic integral in moment to current seismic magnitude calculation moment occurs;
for epicentral distance,
for calibration functions;
Step 4: judge whether seismic waveshape had occurred that peak value (i.e. maximum point) or seismic event were calmed down: if the seismic event that certain seismic event gathers the station had occurred that peak value or seismic event were calmed down, then the earthquake magnitude of magnitude of earthquake being surveyed formulae discovery gathers the earthquake pre-warning earthquake magnitude of the station as this seismic event; Otherwise the earthquake magnitude calculated by magnitude of earthquake predictor formula gathers the earthquake pre-warning earthquake magnitude of the station as this seismic event;
Step 5: the earthquake pre-warning earthquake magnitude at each seismic event picking platform station is averaged, the comprehensive earthquake pre-warning earthquake magnitude of described mean value secondary earthquake early warning for this reason.
Embodiment 4:
A kind of earthquake pre-warning earthquake magnitude acquisition methods, comprises the following steps: step 1: utilize and gather from 10 ~ 20 tableland seismic waves within the kilometer range of earthquake centre 45 P ripple and the S ripple that station strong-motion instrument gathers earthquake;
Step 2: extract each seismic event after the earthquake and gather the characteristic information in first 3 seconds P ripples of station collection; And utilize magnitude of earthquake predictor formula
or
calculate magnitude of earthquake, wherein
for magnitude of earthquake,
for the peak displacement of first 3 seconds P ripples after the earthquake,
for epicentral distance,
for the eigenperiod of first 3 seconds P ripples after the earthquake;
Step 3: utilize magnitude of earthquake to survey formula
calculate magnitude of earthquake, wherein
for magnitude of earthquake,
be motion displacement, its value is that the seismic shock acceleration that collects of described strong-motion instrument or acceleration transducer, from earthquake, the quadratic integral in moment to current seismic magnitude calculation moment occurs;
for epicentral distance,
for calibration functions;
Step 4: judge the earthquake magnitude whether earthquake magnitude that each seismic event gathers the magnitude of earthquake actual measurement formulae discovery of the station is greater than magnitude of earthquake predictor formula and calculates: if the earthquake magnitude of the magnitude of earthquake actual measurement formulae discovery at certain seismic event picking platform station is comparatively large or this seismic event gathers the station and monitors seismic event and calm down, then the earthquake magnitude of magnitude of earthquake being surveyed formulae discovery gathers the earthquake pre-warning earthquake magnitude of the station as this seismic event; Otherwise, perform step 5;
Step 5: judge that this seismic event gathers the seismic waveshape whether peak value mistake of the station: if peak value mistake, then the earthquake magnitude of magnitude of earthquake being surveyed formulae discovery gathers the earthquake pre-warning earthquake magnitude of the station as this seismic event; Otherwise the earthquake magnitude calculated by magnitude of earthquake predictor formula gathers the earthquake pre-warning earthquake magnitude of the station as this seismic event;
Step 6: consider that the make mistakes seismic event substantial deviation that it can be caused to gather of seismic event picking platform station equipment is sometimes actual, we first can calculate the variance of the earthquake pre-warning earthquake magnitude at each seismic event picking platform station for this reason, then remove the earthquake pre-warning earthquake magnitude being greater than 2 times or 3 times variances, finally remaining earthquake pre-warning earthquake magnitude is averaged;
The comprehensive earthquake pre-warning earthquake magnitude of described average secondary earthquake early warning for this reason.
If desired, above calculated earthquake pre-warning earthquake magnitude can be transformed to the earthquake magnitude of other form according to seismology common method, such as, surface wave magnitude etc.
What deserves to be explained is: in prior art, seismic event gathers the station is all adopt sseismograph to gather seismic waveshape, and what sseismograph detected is speed, and when running into the large earthquake of earthquake magnitude, sseismograph is easily saturated, thus can not obtain seismic signal accurately.When Wenchuan earthquake, the sseismograph of most of Sichuan province makes the sseismograph in application Sichuan Province measure magnitude of earthquake because of saturated is 7.3 grades, differs greatly with actual earthquake magnitude.The present invention adopts strong-motion instrument or the acceleration transducer of sense acceleration, well can avoid " saturated " phenomenon, further ensure that earthquake magnitude reliability and the precision of acquisition.
The present invention is not limited to aforesaid embodiment.The present invention expands to any new feature of disclosing in this manual or any combination newly, and the step of the arbitrary new method disclosed or process or any combination newly.
Claims (10)
1. an earthquake pre-warning earthquake magnitude acquisition methods, is characterized in that, comprises the following steps:
Step 1: utilize the P ripple and S ripple that locality shake from the some seismic events collection stations close to earthquake centre;
Step 2: extract each seismic event after the earthquake and gather the characteristic information of front n seismic event second that the station gathers, and utilize magnitude of earthquake predictor formula to calculate magnitude of earthquake;
Step 3: utilize magnitude of earthquake to survey formulae discovery magnitude of earthquake;
Step 4: if the earthquake magnitude that calculates compared with magnitude of earthquake predictor formula of the earthquake magnitude of the magnitude of earthquake actual measurement formulae discovery at certain seismic event picking platform station is large or this seismic event gathers the station and monitors seismic event and calm down, then magnitude of earthquake is surveyed the earthquake pre-warning earthquake magnitude of earthquake magnitude as this seismic event collection station of formulae discovery; Otherwise the earthquake magnitude calculated by magnitude of earthquake predictor formula gathers the earthquake pre-warning earthquake magnitude of the station as this seismic event;
Step 5: the earthquake pre-warning earthquake magnitude at each seismic event picking platform station is averaged; The comprehensive earthquake pre-warning earthquake magnitude of described mean value secondary earthquake early warning for this reason.
2. a kind of earthquake pre-warning earthquake magnitude acquisition methods according to claim 1, is characterized in that, gathers station place adopt strong-motion instrument or acceleration transducer to gather seismic signal at seismic event.
3. a kind of earthquake pre-warning earthquake magnitude acquisition methods according to claim 2, is characterized in that, in described step 2, predictor formula is lg (P
d)=-3.463+0.729M
l-1.374lg (Δ) or M
l=(lg (τ
c)+2.37)/0.47 calculating magnitude of earthquake, wherein M
lfor magnitude of earthquake, P
dfor the peak displacement of n P second ripple before after the earthquake, Δ is epicentral distance, τ
cfor the eigenperiod of n P second ripple before after the earthquake; In described step 3, described actual measurement formula is M
l=lgA
μ+ R (Δ)
l, wherein M
lfor magnitude of earthquake, A
μbe motion displacement, its value is that the seismic shock acceleration that collects of described strong-motion instrument or acceleration transducer, from earthquake, the quadratic integral in moment to current seismic magnitude calculation moment occurs; Δ is epicentral distance, R (Δ)
lfor calibration functions.
4. a kind of earthquake pre-warning earthquake magnitude acquisition methods according to claim 3, is characterized in that, utilizes and locality shake from the some seismic events collection stations within the kilometer range of earthquake centre 45 the P ripple and S ripple that occur latter first 3 seconds in described step 1.
5. a kind of earthquake pre-warning earthquake magnitude acquisition methods according to claim 4, it is characterized in that, the method for averaging to the earthquake pre-warning earthquake magnitude at each seismic event picking platform station in described step 5 directly asks arithmetic average to the earthquake pre-warning earthquake magnitude at each seismic event picking platform station; Or first calculate the variance of the earthquake pre-warning earthquake magnitude at each seismic event picking platform station, then remove the earthquake pre-warning earthquake magnitude being greater than 2 times or 3 times variances, finally remaining earthquake pre-warning earthquake magnitude is averaged.
6. an earthquake pre-warning earthquake magnitude acquisition methods, is characterized in that, comprises the following steps:
Step 1: utilize the P ripple and S ripple that locality shake from the some seismic events collection stations in the kilometer range of earthquake centre 45;
Step 2: extract the characteristic information in front n seismic event second of each seismic event picking platform station collection after the earthquake, and utilize magnitude of earthquake predictor formula to calculate magnitude of earthquake;
Step 3: utilize magnitude of earthquake to survey formulae discovery magnitude of earthquake;
Step 4: judge seismic waveshape whether peak value to have crossed or seismic event is calmed down: if certain seismic event picking platform station detects that seismic event peak value has been crossed or seismic event is calmed down, then the earthquake magnitude of magnitude of earthquake being surveyed formulae discovery gathers the earthquake pre-warning earthquake magnitude of the station as this seismic event; Otherwise the earthquake magnitude calculated by magnitude of earthquake predictor formula gathers the earthquake pre-warning earthquake magnitude of the station as this seismic event;
Step 5: the earthquake pre-warning earthquake magnitude at each seismic event picking platform station is averaged; The comprehensive earthquake pre-warning earthquake magnitude of described mean value secondary earthquake early warning for this reason.
7. a kind of earthquake pre-warning earthquake magnitude acquisition methods according to claim 6, is characterized in that, gathers station place adopt strong-motion instrument or acceleration transducer to gather seismic signal at seismic event; Described n is 3.
8. a kind of earthquake pre-warning earthquake magnitude acquisition methods according to claim 7, is characterized in that, in described step 2, predictor formula is lg (P
d)=-3.463+0.729M
l-1.374lg (Δ) or M
l=(lg (τ
c)+2.37)/0.47 calculating magnitude of earthquake, wherein M
lfor magnitude of earthquake, P
dfor the peak displacement of first 3 seconds P ripples after the earthquake, Δ is epicentral distance, τ
cfor the eigenperiod of first 3 seconds P ripples after the earthquake; In described step 3, described actual measurement formula is M
l=lgA
μ+ R (Δ)
l, wherein M
lfor magnitude of earthquake, A
μbe motion displacement, its value is that the seismic shock acceleration that collects of described strong-motion instrument or acceleration transducer, from earthquake, the quadratic integral in moment to current seismic magnitude calculation moment occurs; Δ is epicentral distance, R (Δ)
lfor calibration functions.
9. an earthquake pre-warning earthquake magnitude acquisition methods, is characterized in that, comprises the following steps:
Step 1: utilize the P ripple and S ripple that locality shake from the some seismic events collection stations close to earthquake centre;
Step 2: extract each seismic event after the earthquake and gather the characteristic information in front n seismic event second of station collection, and utilize magnitude of earthquake predictor formula to calculate magnitude of earthquake;
Step 3: utilize magnitude of earthquake to survey formulae discovery magnitude of earthquake;
Step 4: if the earthquake magnitude that calculates compared with magnitude of earthquake predictor formula of the earthquake magnitude of the magnitude of earthquake actual measurement formulae discovery at certain seismic event picking platform station is large or this seismic event gathers the station and monitors seismic event and to have calmed down or this seismic event gathers the seismic waveshape whether peak value mistake of the station, then magnitude of earthquake is surveyed the earthquake pre-warning earthquake magnitude of earthquake magnitude as this seismic event collection station of formulae discovery; Otherwise the earthquake magnitude calculated by magnitude of earthquake predictor formula gathers the earthquake pre-warning earthquake magnitude of the station as this seismic event;
Step 5: the earthquake pre-warning earthquake magnitude at each seismic event picking platform station is averaged; The comprehensive earthquake pre-warning earthquake magnitude of described mean value secondary earthquake early warning for this reason.
10. a kind of earthquake pre-warning earthquake magnitude acquisition methods according to claim 9, it is characterized in that, described n is 3, and gathers station place employing strong-motion instrument collection seismic signal at seismic event.
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| CN103680069B (en) * | 2012-09-12 | 2018-03-20 | 李宗洪 | Method for forecasting earthquake and earthquake prediction system |
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| CN105676286B (en) * | 2016-01-25 | 2017-11-14 | 西南交通大学 | A kind of Real-time Seismic Estimation of Seismetic Magnitude method for earthquake early-warning system |
| CN106094021B (en) * | 2016-06-01 | 2017-11-17 | 北京科技大学 | A kind of microseism focus method for rapidly positioning based on arrival time difference database |
| CN106291662A (en) * | 2016-09-09 | 2017-01-04 | 吉林大学 | Fracturing causes early warning and the Forecasting Methodology that microseism occurs in hot dry rock |
| CN107798826B (en) * | 2017-09-28 | 2020-04-24 | 北京交通大学 | Earthquake magnitude prediction method for earthquake early warning |
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| CN110824560A (en) * | 2019-11-11 | 2020-02-21 | 宜宾凯翼汽车有限公司 | Earthquake monitoring system and method based on Internet of vehicles |
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