地震 第2輯
Online ISSN : 1883-9029
Print ISSN : 0037-1114
2001年芸予地震の強震動分布と深部地下構造
纐纈 一起古村 孝志
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ジャーナル フリー

2002 年 55 巻 2 号 p. 97-105

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The significant attenuation of seismic motion in the west of the 2001 Geiyo earthquake is inferred from strong motion distributions, observed seismograms and their spectra. Since this attenuation is identified even in the distribution of borehole motions, that is assumed to arise in a deeper part like the mantle wedge. If we assume a low-Q zone in the mantle wedge, a strong motion simulation with Qs = 20-30 can reproduce the observations. This zone may be related to dehydration of the Philippine sea plate.

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