JP4925058B2 - Volcano disaster prevention map system - Google Patents

Description

  The present invention predicts the amount of ash fall in a target facility by simulating a volcanic eruption and can provide a useful reference material for formulating a business continuity plan (BCP). About.

In order to reduce the impact on the business due to disasters such as earthquakes, it has been noted that a business continuity plan (BCP) is formulated. In addition, it is important to evaluate cost effectiveness appropriately in order to make effective use of limited management resources in private companies when investing in disaster prevention. Various systems have been proposed that are used to help. Among such systems, an earthquake risk diagnosis system has been proposed as a means for evaluating loss due to an earthquake. For example, Patent Document 1 (Japanese Patent Application Laid-Open No. 2005-310146) obtains an operating loss that occurs due to damage to a ground, a building that stands on the ground, and a facility that is housed in the building. An earthquake risk diagnosis system for a facility to be diagnosed with the ground, building, and each accommodation facility as components, and a plurality of damage modes for the facility determined by combinations of the presence or absence of damage of each component Probability of setting the probability that the component will be damaged at a predetermined maximum ground acceleration for damage in the tree and setting the probability that the component will not be damaged at a predetermined maximum ground acceleration for no damage Multiply the setting means and the probability set for each component for each damage mode, and calculate the probability of reaching each damage mode with a predetermined maximum ground motion acceleration Product for each damage mode as the expected value of the damage amount, and the expected amount of damage for each damage mode There is described an earthquake risk diagnosis system comprising a business risk calculation means for calculating a commercial earthquake risk of a facility to be diagnosed at a predetermined maximum ground motion acceleration by summing values.
JP 2005-310146 A

  By the way, the Japanese archipelago is located in the subduction zone of the ocean plate, and volcanic activity is active along with the earthquake. According to the Japan Meteorological Agency, there are 108 active volcanoes in Japan, which have caused various human and material disasters in the past. As disaster prevention measures for volcanic disasters, observation and warning systems, hazard maps, and emergency stone removal technology under eruptions have been developed. These technologies are basically government-led disaster prevention technologies, with the main purpose of preserving public goods including human lives.

  As mentioned above, the business continuity plan (BCP) formulation of private companies is accelerating, and there is a tendency for preparatory measures assuming natural disasters. However, as seen in Patent Document 1, various systems for BCP have been proposed for earthquake disasters, but a system for BCP development with volcanic disasters in mind has not been proposed yet. There was a problem.

  Volcanic activity is diverse, and various disasters can occur due to a single eruption phenomenon. For example, if a direct hit such as a lava flow or pyroclastic flow is received, the damage is enormous and basically evacuation is necessary, but the secondary disaster, mud flow, is affected to some extent by the positional relationship between the surface water system and the target facility. Can be assumed.

  On the other hand, ash fall and volcanic gases that reach a thickness of several centimeters or more may affect business activities even if they are not subject to urgent evacuation, or may come from unexpected distances and cause damage depending on weather conditions. There is also. When considering countermeasures for volcanic disasters in this way, the location relationship between various disaster contents and target facilities can be evaluated in combination, and past damage data and prediction results using simulation technology can be used simultaneously. Technologies and systems are considered necessary. However, in the current situation, such a system is not provided.

  This invention solves the above problems, and the invention according to claim 1 causes a volcanic disaster in a volcanic disaster prevention map system that displays a predicted amount of ash fall caused by a volcanic disaster on a display screen. An assumed volcano designation means for designating an assumed volcano, an assumed facility designation means for designating an assumed facility affected by the assumed volcano, a map information storage means for storing map information including at least the assumed volcano and the assumed facility, Ash fall amount distribution state prediction means for predicting the distribution state of ash fall caused by the assumed volcano, and reference ash amount distribution situation storage means for storing the predicted distribution state for each assumed volcano predicted by the ash fall distribution state prediction means And at least the assumed volcano designated by the assumed volcanic designation means, the assumed facility designated by the assumed facility designation means, and the map information And map information stored in the storage means, characterized by comprising a display unit capable of displaying by superimposing a distribution of the stored ash weight by the reference ash weight distribution storage means.

  The invention according to claim 2 is the volcano disaster prevention map system according to claim 1, wherein the display means is an assumed volcano designated by the assumed volcano designation means and an assumption designated by the assumed facility designation means. The facility, the map information stored in the map information storage means, and the ash fall amount distribution state prediction state predicted by the ash fall amount distribution state prediction means are displayed in a superimposed manner.

  Further, the invention according to claim 3 is the volcano disaster prevention map system according to claim 1 or claim 2, wherein the assumed volcano information including volcano name information, position information, eruption activity history information, eruption characteristic information, and the like is stored. An assumed volcano information storage means for storing; and assumed facility information storage means for storing assumed facility information composed of facility name information / position coordinate information, facility type information, construction time information, and the like. .

  The invention according to claim 4 is the volcano disaster prevention map system according to any one of claims 1 to 3, wherein the ash fall distribution state prediction means includes an expected volcano ejection time, an ejection amount, an ejection height, Eruption characteristic setting means for setting particle composition and density of ejecta, meteorological condition setting means for setting weather conditions at the time of the eruption of the assumed volcano, and analysis of wind direction and wind speed based on the settings of the weather condition setting means And a movement diffusion analysis means for analyzing the movement and diffusion of the ejected matter from the assumed volcano based on the setting by the eruption characteristic setting means and the analysis by the weather condition analysis means.

  The invention according to claim 5 is the volcano disaster prevention map system according to any one of claims 1 to 4, further comprising volcano related information acquisition means for acquiring volcano related information provided on the world wide web. It is characterized by providing.

  According to the volcanic disaster prevention map system of the present invention, it is possible to clearly indicate the impact of ash fall accompanying the eruption of the assumed volcano, which has a high possibility of affecting business activities, in the target facility. Reference materials useful in formulating a plan (BCP) can be provided.

  Moreover, according to the volcanic disaster prevention map system of the present invention, the target facility has a function of displaying information on the worldwide web of a volcanic disaster that may affect the target facility, It is possible to comprehend information on volcanic activity currently occurring in the vicinity and information on volcanic activity that may occur in the future.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, the basic concept of the present invention will be described. The volcano disaster prevention map system of the present invention has a database related to an assumed volcano that is considered to cause a volcanic disaster and a database related to an assumed facility that is considered to be affected by such an assumed volcano. The database related to the assumed volcano is based on the location of active volcanoes in Japan, past eruption history, and records of volcanic disasters that have occurred. The database related to the assumed facility records facility information, other public facilities, infrastructure facility information, and the like. Each of these databases is associated with a geographic information system (GIS). The geographic information system is a system that enables creation, storage, use, and management of map information and various additional information related to the map information on a computer.

  In addition, the volcanic disaster prevention map system of the present invention has a system for predicting the distribution of ash fall caused by the eruption of the assumed volcano in the database, and overlaying this distribution on the previous geographic information system. It can be displayed. In addition, in order to predict the distribution of ash fall, given initial conditions related to eruption characteristic data consisting of the eruption time, eruption volume, eruption height, and particle composition and density of the eruption resulting in ash fall, Combined analysis of movement and diffusion of volcanic ash and weather (wind direction / wind speed) analysis. Since these analysis processes have a high load on the computer system, the computer system for predicting the distribution of the amount of ash fall requires a processing time even if the computer system has a relatively high processing capacity.

  Since it is inefficient to perform analysis processing with a high load as described above every time it is superimposed and displayed on the geographic information system, the volcanic disaster prevention map system of the present invention is the amount of ash fall when a standard eruption is simulated. The distribution situation of is prepared as data. For example, if the eruption of the same scale as the past occurred under average weather conditions throughout the year, the standard ash amount distribution status that predicted the distribution status of ash fall amount was calculated in advance for each assumed volcano, Furthermore, this is made into a database so that it can be displayed superimposed on the geographical information system instantly.

  In addition, in the volcanic disaster prevention map system of the present invention, by setting a link function to various volcanic information published on the World Wide Web, information on volcanic disasters that may affect the target facility is considered. It has a function to display in a composite manner.

  Hereinafter, the volcanic disaster prevention map system of the present invention will be described in more detail. FIG. 1 is a diagram showing an outline of a block configuration of a volcano disaster prevention map system according to an embodiment of the present invention. In FIG. 1, 100 is a volcanic disaster prevention map system, 1 is an assumed volcanic designation means, 2 is an assumed facility designation means, 3 is a map information storage means, 4 is a ash fall distribution distribution prediction means, and 5 is a reference ash fall distribution situation storage means. , 6 is information processing means, 7 is display means, 8 is assumed volcanic information storage means, 9 is assumed facility information storage means, 10 is eruption characteristic setting means, 11 is weather condition setting means, 12 is weather condition analysis means, 13 Is a movement diffusion analysis means, and 14 is a volcano related information acquisition means.

  The volcanic disaster prevention map system 100 of the present invention is a system that displays on a display screen the predicted amount of ash fall in a target assumed facility caused by a volcanic disaster, and basically a computer system and a program that runs on the computer system. It is comprised by. The volcanic disaster prevention map system 100 simulates ash fall from an assumed volcano assuming an eruption using a simulation technique, and displays this on a display screen.

  The assumed volcano designation means 1 is for designating an assumed volcano assuming an eruption for displaying by simulation in the volcano disaster prevention map system 100. The assumed facility designation means 2 is for designating an assumed facility that is affected by the designated assumed volcano.

  The map information storage means 3 stores map information including at least an assumed volcano and an assumed facility. As such map information storage means 3, the above-mentioned geographic information system (GIS) can be used.

  The ash fall amount distribution state prediction means 4 predicts the ash fall amount distribution state caused by the assumed volcano, and it is appropriate to use a computer system having a relatively high processing capacity. Further, the reference ash fall amount distribution status storage unit 5 stores the predicted distribution status for each assumed volcano predicted by the ash fall amount distribution status prediction unit 4. By providing such a reference ash fall distribution situation storage means 5, the ash fall distribution situation when simulating a standard eruption is stored as data, and it can be used without requiring analysis time for prediction. It can be so.

  The information processing means 6 includes all other means (assumed volcanic designation means 1, assumed facility designation means 2, map information storage means 3, ash fall distribution status prediction means 4, reference ash fall distribution status storage means 5, display means. 7. Cooperating with assumed volcano information storage means 8, assumed facility information storage means 9, eruption characteristic setting means 10, weather condition setting means 11, weather condition analysis means 12, mobile diffusion analysis means 13, volcano related information acquisition means 14) An information processing mechanism that performs processing operations.

  The display means 7 is a user interface device such as a display screen, and is used for general purposes. However, the display means 7 of the volcanic disaster prevention map system 100 of the present invention includes at least the assumed volcano designated by the assumed volcano designation means 1, the assumed facility designated by the assumed facility designation means 2, and the map information storage means 3. The stored map information and the distribution state of the ash fall amount stored by the reference ash fall amount distribution situation storage means 5 are displayed in a superimposed manner. Moreover, as the display means 7 of the volcanic disaster prevention map system 100 of the present invention, the assumed volcano designated by the assumed volcano designation means 1, the assumed facility 2 designated by the assumed facility designation means, and the map information storage means 3 are stored. The map information to be displayed and the distribution status of the ash fall amount predicted by the ash fall amount distribution status prediction means 4 are displayed in a superimposed manner.

  The assumed volcano information storage means 8 is a database that stores assumed volcano information including volcano name information, position information, eruption activity history information, eruption characteristic information, and the like.

  The assumed facility information storage unit 9 is a database that stores assumed facility information including facility name information / position coordinate information, facility type information, construction time information, and the like.

  The ash fall amount distribution state prediction means 4 for predicting the distribution state of the ash fall amount of the assumed volcano is mainly composed of an eruption characteristic setting means 10, a weather situation setting means 11, a weather situation analysis means 12, and a mobile diffusion analysis means 13.

  The eruption characteristic setting means 10 sets the eruption time, the eruption amount, the eruption altitude, and the particle composition / density of the eruption product, and so-called eruption initial conditions.

  The weather condition setting means 11 is configured to set the weather condition when the assumed volcano erupts. Based on the setting by the weather condition setting unit 11, the weather condition analysis unit 12 analyzes the wind direction and the wind speed. Then, the movement diffusion analysis means 13 analyzes the movement diffusion of the ejected matter (volcanic ash) caused by the assumed volcano based on the initial conditions set by the eruption characteristic setting means 10 and the analysis by the weather condition analysis means 11.

  Moreover, the volcano related information acquisition means 14 is connected to a communication line, and acquires volcano related information transmitted from the government agency on the world wide web. In the volcanic disaster prevention map system 100 of the present invention, the volcanic information transmitted by the government agency is displayed on the display means 7 at the same time. It is possible to comprehend information on volcanic activity.

  Next, a specific example when constructing the volcano disaster prevention map system of the present invention will be described. FIG. 2 is a diagram showing an outline of a specific system configuration of the volcano disaster prevention map system according to the embodiment of the present invention. In FIG. 2, 100 is a volcanic disaster prevention map system, 101 is a local area network, 102 is a high-speed computing computer, 103 is a server computer, 104, 104 ′, 104 ″ are client personal computers, and 105 is a worldwide web. ing. The system configuration shown in FIG. 2 is an example for realizing the present invention, and the volcano disaster prevention map system of the present invention is not limited to such a system configuration.

  For the local area network 101, a wired LAN using Ethernet such as 10BASE-T, 100BASE-TX, or 1000BASE-T, or a wireless LAN using IEEE802.11a, IEEE802.11b, IEEE802.11g, or the like is appropriately used. Can do. By using such a local area network 101, it is possible to distribute resources for realizing each means described above.

  The high-speed computing computer 102 represents, for example, a computer system having a higher processing capacity than a normal personal computer. For example, it is appropriate that such a high-speed computing computer 102 has a role as the ash fall amount distribution state prediction means 4.

  The server computer 103 is preferably used as a configuration related to the storage unit among the units described above. The client personal computers 104, 104 ', and 104 "are suitably used as specifying means and display means among the means described above. For example, the information from the server computer 103 as the storage means is acquired via the local area network 101 by the designation by the client personal computers 104, 104 ′, 104 ″ as the designation means, and the client as the display means Display on personal computers 104, 104 ′, 104 ″. The client personal computers 104, 104 ′, 104 ″ are shown here as being three, but of course any number of computers can be used.

  As the high-speed computing computer 102, the server computer 103, and the client personal computers 104, 104 ', 104' ', any well-known computer can be used.

  The world wide web 105 is an information transmission function on the Internet, and the volcano related information acquisition unit 14 acquires the volcano related information transmitted by the government agency from the world wide web 105. The client personal computers 104, 104 ′, 104 ″ equipped with the browser can serve as the volcano related information acquisition unit 14.

  With the above system configuration, for example, by installing this system on a client personal computer that can be connected to the corporate LAN and the World Wide Web, multiple corporate users can obtain information on volcanic disaster prevention. become. This makes it possible to share a wide range of services such as information about the target facility and BCP compatibility.

  Next, the user interface in the volcano disaster prevention map system of the present invention constructed as described above will be described. FIG. 3 is a diagram showing an example of a graphical user interface screen of the assumed volcano designation means 1 of the volcano disaster prevention map system according to the embodiment of the present invention. FIG. 3 shows the assumed volcano specifying means 1 displayed on the display means 7. FIG. 3 shows a state in which an assumed volcano is selected and designated by a cursor P that is displaced by a pointing device such as a mouse (not shown). On the assumed volcano designation means 1, the volcano names that are candidates for display are displayed in the form stored in the assumed volcano information storage means 8. The user selects and designates an assumed volcano from these candidate volcano names.

  4 is a diagram showing an example of a graphical user interface screen of the assumed facility designation means 2 of the volcanic disaster prevention map system according to an embodiment of the present invention. FIG. 4 shows the assumed facility designation means 2 displayed on the display means 7. FIG. 3 shows a state in which an assumed facility is selected and designated by a cursor P that is displaced by a pointing device such as a mouse (not shown). On the assumed facility designating means 2, the names of the facilities that are candidates for display are displayed as those stored in the assumed facility information storage means 9. The user selects and designates an assumed facility from the candidate facility names.

  5 is a diagram showing an example of a graphical user interface screen of the display means 7 of the volcanic disaster prevention map system according to an embodiment of the present invention. As shown in FIG. 5, the display means 7 includes at least the assumed volcano designated by the assumed volcano designation means 1, the assumed facility designated by the assumed facility designation means 2, and the map information stored in the map information storage means 3. The ash fall amount distribution state stored by the reference ash fall amount distribution state storage means 5 is displayed in a superimposed manner.

  The display means 7 includes the assumed volcano designated by the assumed volcano designation means 1, the assumed facility 2 designated by the assumed facility designation means, the map information stored in the map information storage means 3, and the ash fall amount distribution state prediction means. 4 is also superimposed on the ash fall amount distribution predicted by 4.

  As described above, according to the display in the volcano disaster prevention map system of the present invention, the simulation facility clearly demonstrates the impact of the ash fall accompanying the eruption of the assumed volcano, which is likely to affect the business activities in the target facility. Therefore, it will be possible to provide useful reference materials for formulating a business continuity plan (BCP).

  In addition, in the present invention, the target facility and the range of volcanic disaster that has occurred so far and the results of ash fall prediction (distribution range, amount of ash fall, etc.) can be displayed directly on the map, and the potential impact on the facility. Can be visualized more visually.

  FIG. 6 is a diagram showing an example of a graphical user interface screen of the volcano related information acquisition means 14 of the volcano disaster prevention map system according to the embodiment of the present invention. FIG. 6 shows a state where volcano information is selected by a cursor P that is displaced by a pointing device from information candidates acquired by the volcano related information acquisition unit 14. In this way, in the present invention, volcano information distributed by the government offices on the worldwide web to each active volcano, and research institutions such as independent administrative corporations and universities permit the disclosure and redistribution on the worldwide web. URL (Uniform Resource Locator) information for research results is recorded.

  In addition, according to the volcanic disaster prevention map system of the present invention as described above, it has a function of displaying information on the world wide web of volcanic disasters that may affect the target facility as a target. Yes, it is possible to comprehend information on volcanic activity currently occurring in the vicinity of the target facility and information on volcanic activity that may occur in the future.

Next, the elemental technology related to the simulation for realizing the volcanic disaster prevention map system 100 of the present invention will be described. The ash fall distribution prediction used by the ash fall amount distribution state prediction means 4 of the volcanic disaster prevention map system 100 of the present invention includes volcanic ash movement diffusion analysis (by the movement diffusion analysis means 13) and weather (wind direction / wind speed) analysis (weather condition analysis means 12). )) In combination. In the movement diffusion analysis by the movement diffusion analysis means 13, for example, a Lagrangian particle diffusion model which is an existing numerical analysis method is used. As input parameters (initial conditions) for numerical analysis, the eruption characteristic setting means 10 sets eruption characteristic data including the eruption time, amount, height, and particle composition / density of the eruption causing ash fall. Used. The output results are the distribution range of ash fall, the amount of ash fall and the particle size composition for each location within the range, and the wind direction and wind speed are the existing meso-meteorological model, which is an existing numerical meteorological model, using GPV data published by the Japan Meteorological Agency. (MM5) is used to simulate the situation on a medium scale (from about 1000 km to several tens of km square), which is a condition for volcanic ash movement diffusion. Since the weather conditions vary depending on the date and place, the volcanic disaster prevention map system 100 of the present invention is the most frequently generated result of the typical ash fall phenomenon of each volcano and the year. Predictive results for wind direction and speed are displayed in advance to provide advance information to the user. If a forecast result based on a specific date and time (for example, the day of the maximum annual wind speed) or location wind condition is required according to the request from the user, the result is separately analyzed by a computer for high speed calculation. Can be displayed in the database again.

Hereinafter, the actual simulation will be referred to. September 23, 2004 The ash fall prediction of Mt. Asama at 19:44 was simulated using the mobile diffusion analysis means 13.
The volcanic eruption data set by the eruption characteristic setting means 10 will be described.
1. Particle size distribution: See FIG. Density: 2600kg / m3 (constant)
3. Eruption time: 2004/09/23 19:44
4). Duration: zero Ejection height: 3610m (gamma distribution)
6). Total number of particles: 116,000 Next, the conditions set by the weather condition setting means 11 are shown. Analysis is performed by the weather condition analysis means 12 (MM5) according to the conditions set in this way.
1. Analysis area: (27 km × 36 mesh) × (27 km × 36 mesh)
2. Minimum mesh width: about 1km
3. Time increment: about 2 sec (output is 60 sec)
4). Reference data: Japan Meteorological Agency GPV data (resolution approximately 10km)
5. Analysis period: Three days from 2004/09/22 to 2004/09/24 Output data: U, V, W, T, P
Next, parameters for the moving diffusion analysis means 13 will be shown.
1. Analysis area: 24km x 35km (linear interpolation)
2. Time step: 40 minutes at about 2 sec (linear interpolation) End velocity: function of air density and drag coefficient Diffusion coefficient: Horizontal 150m2 / sec, Vertical 15m2 / sec
The simulation results by setting the parameters as described above will be shown. FIG. 7A is a diagram showing a simulation result by the weather condition analysis means 12 in the sky 2310 m and FIG. 7B in the sky 3610 m.

  FIG. 8 is a view showing a simulation result by the moving diffusion analysis means 13. In addition, in the analysis by the movement diffusion analysis means 13 of the volcanic disaster prevention map system according to the embodiment of the present invention, the effect due to the aggregation of ejecta particles due to moisture in the atmosphere is taken into consideration, and a more accurate simulation result is provided. It is supposed to be.

It is a figure which shows the outline | summary of the block structure of the volcano disaster prevention map system which concerns on embodiment of this invention. It is a figure which shows the outline | summary of the specific system configuration | structure of the volcanic disaster prevention map system which concerns on embodiment of this invention. It is a figure which shows the example of a graphical user interface screen of the assumption volcano designation | designated means of the volcanic disaster prevention map system which concerns on embodiment of this invention. It is a figure which shows the example of a graphical user interface screen of the assumption facility designation | designated means of the volcanic disaster prevention map system which concerns on embodiment of this invention. It is a figure which shows the example of a graphical user interface screen of the display means of the volcanic disaster prevention map system which concerns on embodiment of this invention. It is a figure which shows the example of a graphical user interface screen of the volcano related information acquisition means of the volcano disaster prevention map system which concerns on embodiment of this invention. It is a figure which shows the simulation result by the weather condition analysis means 12. It is a figure which shows the simulation result by the movement diffusion analysis means 13. It is a figure which shows a particle size distribution.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Assumed volcano designation | designated means, 2 ... Assumed facility designation | designated means, 3 ... Map information storage means, 4 ... Ash fall amount distribution situation prediction means, 5 ... Reference ash fall amount distribution situation storage means, 6 ... Information processing means, 7 ... Display means, 8 ... Assumed volcanic information storage means, 9 ... Assumed facility information storage means, 10 ... Eruption characteristic setting means, 11 ... Weather conditions Setting means, 12 ... Weather condition analysis means, 13 ... Mobile diffusion analysis means, 14 ... Volcano related information acquisition means, 100 ... Volcano disaster prevention map system, 101 ... Local area network, 102 ..High-speed computing computer, 103... Server computer, 104, 104 ′, 104 ″... Personal computer for clients, 105.

Claims (5)

In the volcanic disaster prevention map system that displays the predicted amount of ash fall caused by volcanic disaster on the display screen,
An assumed volcano designation means for designating an assumed volcano causing a volcanic disaster;
An assumed facility designation means for designating an assumed facility affected by the assumed volcano;
Map information storage means for storing map information including at least an assumed volcano and an assumed facility;
A means for predicting the amount of ash fall distribution that predicts the amount of ash fall caused by the assumed volcano,
A reference ash amount distribution status storage means for storing a predicted distribution status for each assumed volcano predicted by the ash fall amount distribution status prediction means;
At least the assumed volcano designated by the assumed volcanic designation means, the assumed facility designated by the assumed facility designation means, the map information stored in the map information storage means, and the reference ash fall amount distribution status storage means A volcanic disaster prevention map system, comprising: a display means capable of displaying the distribution of the amount of ash fall in a superimposed manner. The display means includes an assumed volcano designated by the assumed volcano designation means, an assumed facility designated by the assumed facility designation means, map information stored in the map information storage means, and the ash fall amount distribution state prediction. The volcanic disaster prevention map system according to claim 1, wherein the volcanic disaster prevention map system according to claim 1, wherein the ash fall amount distribution predicted by the means is superimposed and displayed. From assumed volcano information storage means to store assumed volcano information consisting of volcano name information, position information, eruption activity history information, eruption characteristic information, etc., facility name information / position coordinate information, facility type information, construction time information, etc. The volcanic disaster prevention map system according to claim 1, further comprising assumed facility information storage means for storing assumed facility information configured. The ash fall amount distribution state prediction means includes an eruption characteristic setting means for setting the eruption time of the assumed volcano, the eruption amount, the eruption height, and the particle composition and density of the ejecta
A weather condition setting means for setting the weather condition at the time of the eruption of the assumed volcano,
Weather condition analysis means for analyzing the wind direction and wind speed based on the setting of the weather condition setting means;
4. The mobile diffusion analysis means for analyzing the movement and diffusion of the ejected matter from the assumed volcano based on the setting by the eruption characteristic setting means and the analysis by the weather condition analysis means. The volcanic disaster prevention map system described in Crab. The volcanic disaster prevention map system according to any one of claims 1 to 4, further comprising volcano related information acquisition means for acquiring volcano related information provided on the world wide web.

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