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Development of an inversion method to extract information on fault geometry from teleseismic data
http://hdl.handle.net/2241/00161369
http://hdl.handle.net/2241/0016136967a84a86-5864-4a4f-98e1-2f5faab4e27d
名前 / ファイル | ライセンス | アクション |
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GJI_220-2 (5.6 MB)
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Item type | Journal Article(1) | |||||
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公開日 | 2020-09-16 | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | Development of an inversion method to extract information on fault geometry from teleseismic data | |||||
言語 | ||||||
言語 | eng | |||||
資源タイプ | ||||||
資源 | http://purl.org/coar/resource_type/c_6501 | |||||
タイプ | journal article | |||||
著者 |
八木, 勇治
× 八木, 勇治× 奥脇, 亮× Shimizu, Kousuke× Fukahata, Yukitoshi |
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抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | Teleseismic waveforms contain information on fault slip evolution during an earthquake, as well as on the fault geometry. A linear finite-fault inversion method is a tool for solving the slip-rate function distribution under an assumption of fault geometry as a single or multiple-fault-plane model. An inappropriate assumption of fault geometry would tend to distort the solution due to Green’s function modelling errors. We developed a new inversion method to extract information on fault geometry along with the slip-rate function from observed teleseismic waveforms. In this method, as in most previous studies, we assumed a flat fault plane, but we allowed arbitrary directions of slip not necessarily parallel to the assumed fault plane. More precisely, the method represents fault slip on the assumed fault by the superposition of five basis components of potency-density tensor, which can express arbitrary fault slip that occurs underground. We tested the developed method by applying it to real teleseismic P waveforms of the MW 7.7 2013 Balochistan, Pakistan, earthquake, which is thought to have occurred along a curved fault system. The obtained spatiotemporal distribution of potency-density tensors showed that the focal mechanism at each source knot was dominated by a strike-slip component with successive strike angle rotation from 205° to 240° as the rupture propagated unilaterally towards the south-west from the epicentre. This result is consistent with Earth’s surface deformation observed in optical satellite images. The success of the developed method is attributable to the fact that teleseismic body waves are not very sensitive to the spatial location of fault slip, whereas they are very sensitive to the direction of fault slip. The method may be a powerful tool to extract information on fault geometry along with the slip-rate function without requiring detailed assumptions about fault geometry. | |||||
書誌情報 |
en : Geophysical Journal International 巻 220, 号 2, p. 1055-1065, 発行日 2020-02 |
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ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 0956-540X | |||||
書誌レコードID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AA10717798 | |||||
DOI | ||||||
識別子タイプ | DOI | |||||
関連識別子 | 10.1093/gji/ggz496 | |||||
権利 | ||||||
権利情報 | This article has been accepted for publication in Geophysical Journal International ©: 2020 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. | |||||
著者版フラグ | ||||||
値 | publisher | |||||
出版者 | ||||||
出版者 | Oxford University Press |