計測震度計の最適配置に基づく震度分布の推定

概要

論文の詳細を見る
The JMA (Japan Meteorological Agency) instrumental seismic intensity, which was triggered by the 1995 Kobe earthquake and introduced in 1996, has significant characteristics that the seismic intensities are determined automatically without any human judgement. Although the continuation from the previous JMA intensity is taken into consideration, a site specific feature is emphasized more than before. This may mislead an immediate response just after an earthquake because the seismic intensity observed is not representation for a wide area but for a particular site. In this paper, an attempt to estimate a spatial distribution of the JMA instrumental seismic intensities was made based on the optimum arrangement of the seismographs when only several observations are available in a city. The techniques used are methods on a basis of Kriging and Cokriging. Predominant frequencies at the observation sites are used as secondary data for Cokriging. We here propose a procedure to show an outline of the seismic intensity distribution in a target area. The procedure can become a useful tool for grasping the outline of earthquake ground motions in the area and for making clear a collocation of the observation sites with different seismic intensities.
日本自然災害学会の論文
2004-02-29