Exploration of Deep Sedimentary Layers around the Tachikawa Fault, Japan
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- YAMANAKA Hiroaki
- Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology
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- KURITA Katsumi
- Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology
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- YAMADA Nobuyuki
- Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology
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- SEO Kazuoh
- Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology
Bibliographic Information
- Other Title
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- 立川断層における深い地盤構造の探査
- タチカワ ダンソウ ニ オケル フカイ ジバン コウゾウ ノ タンサ
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Abstract
Tachikawa fault is an active fault located in the western part of the Tokyo Metropolitan area. A structure of deep sedimentary layers around the fault was explored by microtremor array measurements and an analysis of existing seismic refraction data for the purpose of estimating its effects on earthquake ground motion. It was found from the microtremor array measurements that a basement depth in S-wave profile at down-thrown side of the fault is larger than that at up-thrown side with depth difference of 1.6km. A two-dimensional model was constructed using the explosion data and the depth data on the sediments derived from the microtremor array measurements. Travel times of initial P-wave for the proposed model calculated by a finite difference ray tracing fit the observed travel times better than the model from a conventional time term analysis. We evaluated spatial variations of amplification of earthquake ground motion in the proposed model using a 2D finite difference numerical simulation. It was found that ground motion in the down-thrown side is amplified due to effects of the basement step.
Journal
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- Zisin (Journal of the Seismological Society of Japan. 2nd ser.)
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Zisin (Journal of the Seismological Society of Japan. 2nd ser.) 52 (3), 351-360, 1999
SEISMOLOGICAL SOCIETY OF JAPAN
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Details 詳細情報について
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- CRID
- 1390282679283706368
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- NII Article ID
- 10004680787
- 10008012780
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- NII Book ID
- AN00305741
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- ISSN
- 18839029
- 2186599X
- 00371114
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- NDL BIB ID
- 5301347
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed