2001年芸予地震の概要

概要

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The 2001 Geiyo earthquake with M_w 6.7 occurred at depth of 50 km just beneath the Geiyo islands, in western Seto Inland sea, southwest Japan. The intensity 6 lower on JMA scale was recorded at the town of Kumano-cho, in epicentral area. Two persons were killed and 259 peoples were injured by the earthquake. The Philippine sea plate is subducting from the Nankai trough towards north under the Shikoku and Chugoku districts. In the slab under the Geiyo islands, micro-earthquakes occur at the depth of 40-50 km, which indicates the northern rim of the seismogenic zone. The 2001 Geiyo earthquake occurred in this region in the subducting stab. The main shock has normal fault-type with fault strike and dip of 179 and 55 degrees, respectively. The earthquake fault is 20 km long and 10 km wide with an average dislocation of 1.2 m. Surveys of disasters were taken place immediately after the main shock. Most of fallen gravestones lay in the east-west direction, which coincides well with the direction of S-wave motion in the area.
日本自然災害学会の論文
2001-05-31