Simultaneous estimation of the dip angles and slip distribution on the faults of the 2016 Kumamoto earthquake through a weak nonlinear inversion of InSAR data

• Material Type: 記事
• Title: Simultaneous estimation of the dip angles and slip distribution on the faults of the 2016 Kumamoto earthquake through a weak nonlinear inversion of InSAR data
• Author/Editor: Yukitoshi Fukahata; Manabu Hashimoto
• Publication, Distribution, etc.: 日本 : Springer science+business media
• Publication Date: 2016-12-19
• Publication Date (W3CDTF): 2016-12-19
• Periodical title: EPS : Earth, Planets and Space
• No. or year of volume/issue: 68(204)
• Volume: 68(204)
• ISSN (Periodical Title): 1880-5981
• ISSN-L (Periodical Title): 1343-8832
• Text Language Code: eng
• DOI: 10.1186/s40623-016-0580-4; https://doi.org/10.1186/s40623-016-0580-4
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• Date Accepted (W3CDTF): 2017-01-25T12:55:04+09:00
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• Summary, etc.: At the 2016 Kumamoto earthquake, surface ruptures were observed not only along the Futagawa fault, where main ruptures occurred, but also along the Hinagu fault. To estimate the slip distribution on these faults, we extend a method of nonlinear inversion analysis (Fukahata and Wright in Geophys J Int 173:353-364, 2008) to a two-fault system. With the method of Fukahata and Wright (2008), we can simultaneously determine the optimal dip angle of a fault and the slip distribution on it, based on Akaike’s Bayesian information criterion by regarding the dip angle as an hyperparameter. By inverting the InSAR data with the developed method, we obtain the dip angles of the Futagawa and Hinagu faults as 61° ± 6° and 74° ± 12°, respectively. The slip on the Futagawa fault is mainly strike slip. The largest slip on it is over 5 m around the center of the model fault (130.9° in longitude) with a significant normal slip component. The slip on the Futagawa fault quickly decreases to zero beyond the intersection with the Hinagu fault. On the other hand, the slip has a local peak just inside Aso caldera, which would be a cause of severe damage in this area. A relatively larger reverse fault slip component on a deeper part around the intersection with Aso caldera suggests that something complicated happened there. The slip on the Hinagu fault is almost a pure strike slip with a peak of about 2.4 m. The developed method is useful in clarifying the slip distribution, when a complicated rupture like the Kumamoto earthquake happens in a remote area.
• DOI: 10.1186/s40623-016-0580-4; https://doi.org/10.1186/s40623-016-0580-4
• Access Restrictions: インターネット公開
• Rights (production): © The Author(s) 2016. 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/2433/218213; http://id.ndl.go.jp/digimeta/10267475; https://dl.ndl.go.jp/pid/10267475; http://link.springer.com/content/pdf/10.1186/s40623-016-0580-4.pdf; http://link.springer.com/article/10.1186/s40623-016-0580-4/fulltext.html
• Is Referenced By: The Origin of Large, Long‐Period Near‐Fault Ground Velocities During Surface‐Breaking Strike‐Slip Earthquakes; https://cir.nii.ac.jp/crid/1050575727762371328; Inversion algorithm determining sharp boundaries in electrical resistivity tomography; https://cir.nii.ac.jp/crid/1050585407777857408; Strain partitioning and interplate coupling along the northern margin of the Philippine Sea plate, estimated from Global Navigation Satellite System and Global Positioning System-Acoustic data; https://cir.nii.ac.jp/crid/1360285710979665536; A systematic scheme to develop dynamic earthquake rupture scenarios: a case study on the Wenchuan–Maoxian Fault in the Longmen Shan, China, thrust belt; https://cir.nii.ac.jp/crid/1360865815491550464; 超多点稠密地震観測による断層帯発達過程の解明に向けて; https://cir.nii.ac.jp/crid/1390004222631011072; The Advancement of Research on Inland Earthquake Generation 2014–2018; https://cir.nii.ac.jp/crid/1390283659860970112; 九州中部の第四紀テクトニクスと2016年熊本地震; https://cir.nii.ac.jp/crid/1390567172584423680
• References: Fan-delta uplift and mountain subsidence during the Haiti 2010 earthquake; https://cir.nii.ac.jp/crid/1050001335813357824; Rupture process of the 2016 Kumamoto earthquake in relation with the thermal structure around Aso volcano; https://cir.nii.ac.jp/crid/1050282677536988928; Spatial heterogeneities in tectonic stress in Kyushu, Japan and their relation to a major shear zone; https://cir.nii.ac.jp/crid/1050282810809480960; Source rupture processes of the foreshock and mainshock in the 2016 Kumamoto earthquake sequence estimated from the kinematic waveform inversion of strong motion data; https://cir.nii.ac.jp/crid/1050564285791632128; Source rupture processes of the 2016 Kumamoto, Japan, earthquakes estimated from strong‐motion waveforms; https://cir.nii.ac.jp/crid/1050845760771337216; A method for the joint inversion of geodetic and seismic waveform data using ABIC: application to the 1997 Manyi, Tibet, earthquake; https://cir.nii.ac.jp/crid/1360002217556339840; New, improved version of generic mapping tools released; https://cir.nii.ac.jp/crid/1360292617909532032; Introduction of uncertainty of Green's function into waveform inversion for seismic source processes; https://cir.nii.ac.jp/crid/1360565168144327808; The global CMT project 2004–2010: Centroid-moment tensors for 13,017 earthquakes; https://cir.nii.ac.jp/crid/1360855567862858240; Characteristics of ASTER GDEM version 2; https://cir.nii.ac.jp/crid/1360855568523632384; The 1989 Loma Prieta earthquake imaged from inversion of geodetic data; https://cir.nii.ac.jp/crid/1361137044874957440; InSAR constraints on the source parameters of the 2001 Bhuj earthquake; https://cir.nii.ac.jp/crid/1362262943317137280; Fault Slip Distribution of the 1999 Mw 7.1 Hector Mine, California, Earthquake, Estimated from Satellite Radar and GPS Measurements; https://cir.nii.ac.jp/crid/1362262945375751424; Source model for the M_<i>w</i> 6.7, 23 October 2002, Nenana Mountain Earthquake (Alaska) from InSAR; https://cir.nii.ac.jp/crid/1362262945922189312; A non-linear geodetic data inversion using ABIC for slip distribution on a fault with an unknown dip angle; https://cir.nii.ac.jp/crid/1363670318773721344; Geodetic data inversion using a Bayesian information criterion for spatial distribution of fault slip; https://cir.nii.ac.jp/crid/1363951796264054400; 沖縄トラフの拡大と九州地方の地殻変動 (2); https://cir.nii.ac.jp/crid/1390001204303090560
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