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  1. 防災科研関係論文

Effect of fault discretization on geodetic source inversion and usefulness of the trans-dimensional inversion approach

https://nied-repo.bosai.go.jp/records/2929
https://nied-repo.bosai.go.jp/records/2929
74809743-cfb4-4b2f-b3df-cdd17a3801de
Item type researchmap(1)
公開日 2023-09-20
タイトル
言語 en
タイトル Effect of fault discretization on geodetic source inversion and usefulness of the trans-dimensional inversion approach
言語
言語 eng
著者 Hisahiko Kubo

× Hisahiko Kubo

en Hisahiko Kubo

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Wataru Suzuki

× Wataru Suzuki

en Wataru Suzuki

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Akemi Noda

× Akemi Noda

en Akemi Noda

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抄録
内容記述タイプ Other
内容記述 <title>Summary</title>
Earthquake source inversion, which estimates the heterogeneous slip distribution on fault from geophysical data, is a fundamental technique for estimating earthquake rupture process and obtaining information about the physics of fault rupture. Source inversion requires the spatial discretization of fault, which can be performed uniformly and non-uniformly. Uniform fault discretization is a conventional approach that requires smoothing and/or non-negative constraints of slips as prior information to obtain a stable and reliable solution; however, the combination of uniform discretization and these prior constraints may distort a source-inversion solution. As a non-uniform discretization approach, source inversion using a trans-dimensional inversion approach has recently attracted attention. To study the effect of fault discretization on geodetic source inversion, through the analysis of geodetic data on the 2015 Gorkha, Nepal, earthquake and synthetic tests, we investigated what kind of solution the conventional source inversion with uniform discretization and the trans-dimensional source inversion provide and what kind of uncertainty their solutions have. We found that the combination of uniform discretization and non-negative constraint led to excessively smooth solutions with poor data fit. Even without using the non-negative constraint, the conventional inversion with uniform discretization provided distorted and sometimes over-fitted solutions, which could not be identified based on uncertainty information. In contrast, the trans-dimensional source inversion provided reasonable solutions composed only of meaningful slips, which were required to explain the data. We also found that uncertainty information depends on the source-inversion method; consequently, the evaluation of method-induced uncertainty is difficult. This suggests that we look at earthquake ruptures through the lens of source inversion with inherent method-dependent bias.
言語 en
書誌情報 en : Geophysical Journal International

巻 229, 号 2, p. 1063-1076, 発行日 2022-05
出版者
言語 en
出版者 Oxford University Press (OUP)
ISSN
収録物識別子タイプ EISSN
収録物識別子 1365-246X
DOI
関連識別子 10.1093/gji/ggab515
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