Seismotectonics of the 2018 northern Osaka M6.1 earthquake and its aftershocks : joint movements on strike-slip and reverse faults in inland Japan

• 資料種別: 記事
• タイトル: Seismotectonics of the 2018 northern Osaka M6.1 earthquake and its aftershocks : joint movements on strike-slip and reverse faults in inland Japan
• 著者・編者: Miroslav Hallo; Ivo Opršal; Kimiyuki Asano
• 出版事項: 日本 : Springer Nature
• 出版年月日等: 2019-03-27
• 出版年（W3CDTF）: 2019-03-27
• タイトル（掲載誌）: EPS : Earth, Planets and Space
• 巻号年月日等（掲載誌）: 71(34)
• 掲載巻: 71(34)
• ISSN（掲載誌）: 1880-5981
• ISSN-L（掲載誌）: 1343-8832
• 本文の言語コード: eng
• DOI: 10.1186/s40623-019-1016-8; https://doi.org/10.1186/s40623-019-1016-8
• 国立国会図書館永続的識別子: info:ndljp/pid/11286868; https://dl.ndl.go.jp/pid/11286868
• コレクション（共通）: 障害者向け資料
• コレクション（障害者向け資料：レベル1）: テキストデータ
• コレクション（個別）: 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
• 収集根拠: オンライン資料収集制度
• 受理日（W3CDTF）: 2019-05-27T20:17:25+09:00
• 保存日（W3CDTF）: 2019-05-27
• 記録形式（IMT）: application/pdf
• オンライン閲覧公開範囲: 国立国会図書館内限定公開
• デジタル化資料送信: 図書館・個人送信対象外
• 遠隔複写可否（NDL）: 可
• 掲載誌（URI）: https://earth-planets-space.springeropen.com/articles
• 掲載誌（国立国会図書館永続的識別子）: info:ndljp/pid/11245705; https://dl.ndl.go.jp/pid/11245705
• 連携機関・データベース: 国立国会図書館 : 国立国会図書館デジタルコレクション; https://dl.ndl.go.jp

• 要約等: On June 18, 2018, an MJMA6.1 inland crustal earthquake occurred on the northeast edge of the Osaka basin, Japan. This event impacted the region by the maximum PGA larger than 0.9 g, and it was followed by a series of weaker aftershocks. The earthquakes were located near the Arima-Takatsuki Tectonic Line (ENE-WSW dextral strike-slip faults) and the Uemachi fault system (N-S reverse faults), hence the seismotectonic interpretations we assumed to be rather complex. Here we propose a seismotectonic model of this sequence based on seismological data and stress field considerations. In particular, we infer to a centroid moment tensor for the mainshock using Bayesian full-waveform inversion from strong motion records. The solution of Mw5.6 involved a significant CLVD component, which we interpreted as being due to rupture process on a complex fault geometry. Decomposition of the non-DC moment tensor into major and minor pure-shear moment tensors suggests a combination of strike-slip and reverse faulting mechanisms. We also analyzed the 108 strongest aftershocks with MJMA between 2.0 and 4.1 using records from broadband and short-period stations. Aftershocks’ moment tensors inverted from P-wave amplitudes exhibit mainly strike-slip and reverse faulting mechanisms, having significant spatial variations. The local stress field inverted from these mechanisms had a dominant maximum (compressional) principal stress σ1 in ESE-WNW direction, while σ2 ≅ σ3. Both ENE-WSW dextral strike-slip and N-S reverse faults can be active in such stress field as observed in the mainshock (without any need for stress spatial inhomogeneity). To conclude, the activated strike-slip fault is parallel to the Arima-Takatsuki Tectonic Line. The activated N-S reverse fault is dipping to east by 50° similarly as the Uemachi fault system. Joint shear movements on both of these faults contributed significantly to the total seismic moment of the mainshock.
• DOI: 10.1186/s40623-019-1016-8; https://doi.org/10.1186/s40623-019-1016-8
• オンライン閲覧公開範囲: インターネット公開
• 著作権情報: © The Author(s) 2019. 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.
• 関連情報（URI）: http://hdl.handle.net/2433/240626; http://id.ndl.go.jp/digimeta/11286868; https://dl.ndl.go.jp/pid/11286868; http://link.springer.com/content/pdf/10.1186/s40623-019-1016-8.pdf; http://link.springer.com/article/10.1186/s40623-019-1016-8/fulltext.html
• 参照: High-resolution three-dimensional azimuthal velocity anisotropy of S-waves in southern-central Japan, based on ambient noise tomography; https://cir.nii.ac.jp/crid/1360021391865419392; High-Resolution Three-dimensional Azimuthal Velocity Anisotropy of S-waves in southwest Japan, based on Ambient Noise Tomography; https://cir.nii.ac.jp/crid/1360022307170983936; Strong-Motions From Damaging Moderate Magnitude (5.9 ≥ Mw) Earthquakes in Japan Recorded by K-NET and KiK-net; https://cir.nii.ac.jp/crid/1360572092558503168; Shallow structure and late quaternary slip rate of the Osaka Bay fault, western Japan; https://cir.nii.ac.jp/crid/1360869854375589632; 2018年大阪府北部の地震における茨木市内の震度と地盤卓越振動数の関係; https://cir.nii.ac.jp/crid/1390288778747587712; Reproductions of Strong Ground Motions during the 2018 Northern Osaka Prefecture, Japan, Earthquake Using the Empirical Green’s Function Method; https://cir.nii.ac.jp/crid/1390300533228717184; PS干渉SAR解析によって推定された阪神エリアにおける活断層近傍の地表変動; https://cir.nii.ac.jp/crid/1390857512438857216; Ambient noise tomography for a high-resolution 3D S-wave velocity model of the Kinki Region, Southwestern Japan, using dense seismic array data; https://cir.nii.ac.jp/crid/2051714792015349120; Driving stress and seismotectonic implications of the 2013 Mw5.8 Awaji Island earthquake, southwestern Japan, based on earthquake focal mechanisms before and after the mainshock; https://cir.nii.ac.jp/crid/2051996266981889024
• 連携機関・データベース: 国立情報学研究所 : CiNii Research; https://cir.nii.ac.jp/
• 提供元機関・データベース: 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
• 書誌ID（NDLBibID）: 11286868; http://id.ndl.go.jp/bib/11286868
• NII論文ID: 120006601442