統計的アプローチによる地殻活動解明―（Ｉ）統一化された形式をもつ日本列島地殻現象データベース構築―

Abstract

A trial to integrate various datasets obtained by observation into those with a spatially and temporarily high-resolution gridded data format is presented. Compiling, conservation, and share of the database with the uni.ed gridded data format for different seismotectonic indices, such as seismicity, strain rate, gravity anomaly, heat flow, etc., lead to promote further understanding of crustal activity through statistical examination on their spatiotemporal relationships. The use of one seismotectonic index with the gridded data format makes it possible to compare with any other seismotectonic index whether or not this has the gridded data format. Our .nal goal is comprehensive understanding of crustal activity through the statistical approach using gridded seismotectonic indices. We here introduce a first attempt to accomplish it. First, we converted the hypocenter catalog compiled by the Japan meteorological Agency and the data of GPS operated by the Geographical Survey Institute, Japan, into various geodetic (e.g., dilatation rate and maximum shear strain rate) and seismic (e.g., seismic energy and the number of earthquakes) indices with the gridded data format. Next, we drew scatter diagrams to overview the relationships between seismic and geodetic indices. Third, we introduced new statistical indices to quantitatively represent the temporal changes in the relationships.