4:30 PM - 4:45 PM
[MIS27-08] Integrated IDP catalog considering the continuity of historical and modern earthquake catalog
Keywords:Historical earthquakes, IDP, Seismic catalog
For historical earthquakes, seismic intensities at each point is estimated based on the description of collected historical materials, and the epicenter, hypocenter, and magnitude of the earthquake are estimated. Several catalogues of the results have been published. Regarding the seismic intensity data points (IDPs), "[Intensity distribution and iso-seismal maps for historical earthquakes in Japan]" and "[comprehensive table of Japanese historical earthquake]" are compiled. For current earthquakes, Japan Meteorological Agency has been publishing JMA seismic intensity data as part of the Seismological Bulletin of Japan. It has been maintained back to 1919 and is available online.
If the IDPs can be searched and displayed through both catalogs of historical and current earthquakes, it will be useful for estimating the epicenter of the historical earthquake and for examining the validity of seismic intensity estimation. However, the differences between the two catalogues should be carefully handled for integration. The current catalog includes JMA intensity and instrumental intensity are given. For historical earthquakes, there are cases where an estimated JMA seismic intensity is given, and expressions based on historical materials such as "earthquake" and "strong earthquake" are given. Regarding the location of the observation points, the current catalog provides the location (geographic coordinates) of the observation stations. For historical earthquakes, the observation points are determined based on descriptions of historical materials, but their accuracy varies. They can be identified at the building, and in some cases only in villages, counties, or countries. In "[Intensity distribution and iso-seismal maps for historical earthquakes in Japan]" mentioned above, the observation points are provided as current municipal level. It is necessary to identify and register observation points for historical earthquakes. Also, when integrating the catalog, it is necessary to provide information on the accuracy of the seismic intensity and location of observation points, especially in the catalog of historical earthquakes.
Even if the seismic IDPs of historical and current earthquakes are integrated, the distribution of observation points is different. When comparing seismic intensity distributions of historical and current earthquakes, it is effective to create a virtual IDPs and estimate the seismic intensity of them using the attenuation relation of seismic intensity or interpolation of the seismic intensity based on site amplification zoning. We propose a system to display the integrated catalog of observed and virtual IDPs.
If the IDPs can be searched and displayed through both catalogs of historical and current earthquakes, it will be useful for estimating the epicenter of the historical earthquake and for examining the validity of seismic intensity estimation. However, the differences between the two catalogues should be carefully handled for integration. The current catalog includes JMA intensity and instrumental intensity are given. For historical earthquakes, there are cases where an estimated JMA seismic intensity is given, and expressions based on historical materials such as "earthquake" and "strong earthquake" are given. Regarding the location of the observation points, the current catalog provides the location (geographic coordinates) of the observation stations. For historical earthquakes, the observation points are determined based on descriptions of historical materials, but their accuracy varies. They can be identified at the building, and in some cases only in villages, counties, or countries. In "[Intensity distribution and iso-seismal maps for historical earthquakes in Japan]" mentioned above, the observation points are provided as current municipal level. It is necessary to identify and register observation points for historical earthquakes. Also, when integrating the catalog, it is necessary to provide information on the accuracy of the seismic intensity and location of observation points, especially in the catalog of historical earthquakes.
Even if the seismic IDPs of historical and current earthquakes are integrated, the distribution of observation points is different. When comparing seismic intensity distributions of historical and current earthquakes, it is effective to create a virtual IDPs and estimate the seismic intensity of them using the attenuation relation of seismic intensity or interpolation of the seismic intensity based on site amplification zoning. We propose a system to display the integrated catalog of observed and virtual IDPs.