Estimation of S-wave velocity structure of deep sedimentary layers using a waveform inversion of S-wave in earthquake record.
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- Suzuki Haruhiko
- Oyo Corp. Tokyo Institute of Technology
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- Yamanaka Hiroaki
- Tokyo Institute of Technology
Bibliographic Information
- Other Title
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- 地震動のS波部分を用いた深部地盤のS波速度構造モデルの推定
- ジシンドウ ノ Sハ ブブン オ モチイタ シンブ ジバン ノ Sハ ソクド コウゾウ モデル ノ スイテイ
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Abstract
We propose an inversion method for estimating of a 1D S-wave velocity structure of deep sedimentary layers using S-wave parts of ground motion records for assessment of site amplification. We assume a simple source time function and plane wave incident to a layered model from the basement. A genetic algorithm is used in the inversion to find an optimal model that has the minimum misfit between observed and synthetic S-waves. We conducted numerical experiments using synthetic data. Although the true S-wave profile is reconstructed from the inversion, it turns out that the resolution of Q-value is low. We also have difficulties in applying this method to data at a site with a basement depth less than 0.1km. We applied our method to actual earthquake data at Narita in the Kanto basin. The inverted structure of the deep sediments is in good agreement with the S-wave velocity profile from PS-logging. The observed transfer function of SH-wave estimated from spectral ratio between the surface and bottom of the borehole agrees with that of the inverted model. The S-wave velocity structures were also retrieved from the inversions of earthquake data at stations around Lake Biwa. The basement depths are estimated from 0.2 to 0.3km in the area. The peak periods of H/V spectral ratios for surface waves in earthquake records at the sites agree well those of Rayleigh wave ellipticities for the inverted S-wave structures. The source parameters estimated from incident waves revealed in the inversions are in good agreement with previous results.<br>
Journal
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- BUTSURI-TANSA(Geophysical Exploration)
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BUTSURI-TANSA(Geophysical Exploration) 62 (2), 261-275, 2009
The Society of Exploration Geophysicists of Japan
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Details 詳細情報について
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- CRID
- 1390001206496465536
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- NII Article ID
- 10025643335
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- NII Book ID
- AN10028069
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- ISSN
- 18814824
- 09127984
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- NDL BIB ID
- 10377700
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
- KAKEN
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- Abstract License Flag
- Disallowed
