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Complex Ruptures of the 11 April 2011 Mw 6.6 Iwaki Earthquake Triggered by the 11 March 2011 Mw 9.0 Tohoku Earthquake, Japan

2013; Seismological Society of America; Volume: 103; Issue: 2B Linguagem: Inglês

10.1785/0120120140

1943-3573

Y. Fukushima, Youichiro Takada, Manabu Hashimoto,

Earthquake Detection and Analysis

Research Article| May 01, 2013 Complex Ruptures of the 11 April 2011 Mw 6.6 Iwaki Earthquake Triggered by the 11 March 2011 Mw 9.0 Tohoku Earthquake, Japan Yo Fukushima; Yo Fukushima Disaster Prevention Research Institute, Kyoto University, Gokasho, Uji 611‐0011, Japan Search for other works by this author on: GSW Google Scholar Youichiro Takada; Youichiro Takada Disaster Prevention Research Institute, Kyoto University, Gokasho, Uji 611‐0011, Japan Search for other works by this author on: GSW Google Scholar Manabu Hashimoto Manabu Hashimoto Disaster Prevention Research Institute, Kyoto University, Gokasho, Uji 611‐0011, Japan Search for other works by this author on: GSW Google Scholar Author and Article Information Yo Fukushima Disaster Prevention Research Institute, Kyoto University, Gokasho, Uji 611‐0011, Japan Youichiro Takada Disaster Prevention Research Institute, Kyoto University, Gokasho, Uji 611‐0011, Japan Manabu Hashimoto Disaster Prevention Research Institute, Kyoto University, Gokasho, Uji 611‐0011, Japan Publisher: Seismological Society of America First Online: 14 Jul 2017 Online ISSN: 1943-3573 Print ISSN: 0037-1106 Bulletin of the Seismological Society of America (2013) 103 (2B): 1572–1583. https://doi.org/10.1785/0120120140 Article history First Online: 14 Jul 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Yo Fukushima, Youichiro Takada, Manabu Hashimoto; Complex Ruptures of the 11 April 2011 Mw 6.6 Iwaki Earthquake Triggered by the 11 March 2011 Mw 9.0 Tohoku Earthquake, Japan. Bulletin of the Seismological Society of America 2013;; 103 (2B): 1572–1583. doi: https://doi.org/10.1785/0120120140 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyBulletin of the Seismological Society of America Search Advanced Search Abstract After the 11 March 2011 Mw 9.0 Tohoku earthquake, Japan, a swarm of shallow normal‐faulting earthquakes was triggered in a localized region beneath the border between Fukushima and Ibaraki prefectures in eastern Honshu. Here we examine the coseismic displacement field and a fault model of the largest event of the swarm, the 11 April 2011 Mw 6.6 Iwaki earthquake. Radar interferometry applied to data of the Japanese ALOS satellite reveals complex ruptures associated with the Iwaki earthquake. In particular, the interferogram clearly shows multiple surface ruptures along each of the subparallel Yunodake and Itozawa faults. The slip distributions on these faults, as estimated by inverting the interferogram, suggest that the faults dip 60°–70° westward and that slip on the Itozawa fault extended to a splay fault at depths shallower than about 5 km. Our results indicate that the highland area west of the Itozawa fault was downthrown by up to 2.4 m during the Iwaki earthquake.Online Material: Original and de‐trended interferograms over a wider area. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.