Bayesian inference and interpretation of centroid moment tensors of the 2016 Kumamoto earthquake sequence, Kyushu, Japan

• Material Type: 記事
• Title: Bayesian inference and interpretation of centroid moment tensors of the 2016 Kumamoto earthquake sequence, Kyushu, Japan
• Author/Editor: Miroslav Hallo; Kimiyuki Asano; Frantisek Gallovic
• Publication, Distribution, etc.: 日本 : Springer Nature
• Publication Date: 2017-09-25
• Publication Date (W3CDTF): 2017-09-25
• Periodical title: EPS : Earth, Planets and Space
• No. or year of volume/issue: 69(134)
• Volume: 69(134)
• ISSN (Periodical Title): 1880-5981
• ISSN-L (Periodical Title): 1343-8832
• Text Language Code: eng
• DOI: 10.1186/s40623-017-0721-4; https://doi.org/10.1186/s40623-017-0721-4
• Persistent ID (NDL): info:ndljp/pid/11002660; https://dl.ndl.go.jp/pid/11002660
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• Collection (particular): 国立国会図書館デジタルコレクション > 電子書籍・電子雑誌 > その他; https://dl.ndl.go.jp/collections/B00035
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• Date Accepted (W3CDTF): 2017-12-14T17:18:17+09:00
• Date Captured (W3CDTF): 2017-12-12
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• Summary, etc.: On April 16, 2016, Kumamoto prefecture in Kyushu region, Japan, was devastated by a shallow M JMA7.3 earthquake. The series of foreshocks started by M JMA6.5 foreshock 28 h before the mainshock. They have originated in Hinagu fault zone intersecting the mainshock Futagawa fault zone; hence, the tectonic background for this earthquake sequence is rather complex. Here we infer centroid moment tensors (CMTs) for 11 events with M JMA between 4.8 and 6.5, using strong motion records of the K-NET, KiK-net and F-net networks. We use upgraded Bayesian full-waveform inversion code ISOLA-ObsPy, which takes into account uncertainty of the velocity model. Such an approach allows us to reliably assess uncertainty of the CMT parameters including the centroid position. The solutions show significant systematic spatial and temporal variations throughout the sequence. Foreshocks are right-lateral steeply dipping strike-slip events connected to the NE–SW shear zone. Those located close to the intersection of the Hinagu and Futagawa fault zones are dipping slightly to ESE, while those in the southern area are dipping to WNW. Contrarily, aftershocks are mostly normal dip-slip events, being related to the N–S extensional tectonic regime. Most of the deviatoric moment tensors contain only minor CLVD component, which can be attributed to the velocity model uncertainty. Nevertheless, two of the CMTs involve a significant CLVD component, which may reflect complex rupture process. Decomposition of those moment tensors into two pure shear moment tensors suggests combined right-lateral strike-slip and normal dip-slip mechanisms, consistent with the tectonic settings of the intersection of the Hinagu and Futagawa fault zones.
• DOI: 10.1186/s40623-017-0721-4; https://doi.org/10.1186/s40623-017-0721-4
• Access Restrictions: インターネット公開
• Rights (production): © The Author(s) 2017. 7. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
• Related Material (URI): http://hdl.handle.net/2433/227677; http://id.ndl.go.jp/digimeta/11002660; https://dl.ndl.go.jp/pid/11002660; http://link.springer.com/content/pdf/10.1186/s40623-017-0721-4.pdf; http://link.springer.com/article/10.1186/s40623-017-0721-4/fulltext.html
• Is Referenced By: Modeling of Long-Period Ground Motions in the Nankai Subduction Zone: Model Simulation Using the Accretionary Prism Derived from Oceanfloor Local S-Wave Velocity Structures; https://cir.nii.ac.jp/crid/1360285706120541056
• Data Provider (Database): 国立情報学研究所 : CiNii Research; https://cir.nii.ac.jp/
• Original Data Provider (Database): 学術機関リポジトリデータベース; https://irdb.nii.ac.jp; 雑誌記事索引データベース; https://ndlsearch.ndl.go.jp; Crossref; https://www.crossref.org; CiNii Articles
• Bibliographic ID (NDL): 11002660; http://id.ndl.go.jp/bib/11002660
• NAID: 120006355740