内陸地震による家屋の被害率と被害域

概要

論文の詳細を見る
After the 1995 M_j 7.3 Hyogo-ken-nanbu earthquake, seismic activity increased on the Japanese Islands, and five earthquake disasters--four inland type and one intra-slab type--occurred. The inland-type events include the 1995 Northern Niigata Prefecture earthquake of the reverse-fault type and three strike-slip fault-type earthquakes ; the 1997 Northwestern Kagoshima Prefecture earthquake ; the 1997 Northern Yamaguchi Prefecture earthquake ; and the 2000 Western Tottori Prefecture earthquake. The intra-slab-type earthquake is named the 2001 Geiyo earthquake. The relationship between the structural damage caused by the above five earthquakes and two kinds of earthquake magnitude--the Japan Meteorological Agency scale magnitude (M_j) and the moment magnitude (M_w) --are investigated. From the present study, no direct relationship between M_j and structural damage can be found, while the number of damaged structures increases with increasing M_w. The percentage of structural damage is calculated by multiplying by 100 the number of damaged structures that are divided by the total number of structures in each municipality. Also, the "damage circle" is defined as the circular area that covers almost every municipality that has one or more earthquake-damaged structures. The maximum structural damage percentage by the inland earthquakes tends to be significantly larger than that by the intra-slab Geiyo earthquake. lt is pointed out that the radius of the damage circle due to the strike-slip type inland earthquake is nearly proportional to M_w and is smaller than the radius of the intra-slab earthquake with a similar magnitude.
2003-02-28

内陸地震による家屋の被害率と被害域

スポンサーリンク

概要

著者

関連論文

スポンサーリンク