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  1. 防災科研関係論文

Two-layer Q(S) structure of the slab near the southern Kurile trench

https://nied-repo.bosai.go.jp/records/4996
https://nied-repo.bosai.go.jp/records/4996
67e408de-d69a-4984-9ab4-0d4cf8ab7f2d
Item type researchmap(1)
公開日 2023-03-30
タイトル
言語 en
タイトル Two-layer Q(S) structure of the slab near the southern Kurile trench
言語
言語 eng
著者 Takahiro Maeda

× Takahiro Maeda

en Takahiro Maeda

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Tsutomu Sasatani

× Tsutomu Sasatani

en Tsutomu Sasatani

Search repository
抄録
内容記述タイプ Other
内容記述 We estimate Q(s) values (quality factor for S-wave) of the slab near the southern Kurile trench by using seismic data observed at ocean bottom seismometer (OBS) stations from selected local earthquakes. The seismic rays pass mainly through the slab and this enable us to directly estimate the slab Q(s) values. The spectral inversion and coda normalization method are applied to these data. The estimated Q(s) values from the two methods are nearly the same and increase with frequencies. However, these Q(s) values are not high enough to explain the abnormal distribution of ground motion that has been recognized as abnormal distribution of seismic intensities at the Japanese arc. Thus we propose a two-layer Q(s) structure of the slab to explain the both facts, our slab Q(s) values and the abnormal distribution of ground motion. The two-layer Q(s) structure consists of the upper layer with not so high Q(s) values (39 f(1.0)) and lower layer with very high Q(s) values (500 f(1.0)); the upper layer has a thickness of about 50 km. Seismic activity is restricted only within the upper layer of the two-layer Q(s) structure. This may mean that the two-layer Q(s) structure reflects the different material property between the upper and lower layer of the slab.
言語 en
書誌情報 en : EARTH PLANETS AND SPACE

巻 58, 号 5, p. 543-553, 発行日 2006
出版者
言語 en
出版者 SPRINGEROPEN
ISSN
収録物識別子タイプ ISSN
収録物識別子 1880-5981
DOI
関連識別子 10.1186/BF03351952
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