{"id":242,"date":"2012-12-28T03:38:03","date_gmt":"2012-12-27T18:38:03","guid":{"rendered":"http:\/\/www.eri.u-tokyo.ac.jp\/_html\/en\/?p=242"},"modified":"2016-04-14T16:59:22","modified_gmt":"2016-04-14T07:59:22","slug":"regional-extent-of-the-large-coseismic-slip-zone-of-the-2011-mw-9-0-tohoku-oki-earthquake-delineated-by-on-fault-aftershocks","status":"publish","type":"post","link":"https:\/\/www.eri.u-tokyo.ac.jp\/en\/research\/242\/","title":{"rendered":"Regional extent of the large coseismic slip zone of the 2011 Mw 9.0 Tohoku-Oki earthquake delineated by on-fault aftershocks"},"content":{"rendered":"<p style=\"text-align: center\"><strong>Regional extent of the large coseismic slip zone of the 2011 Mw 9.0 Tohoku-Oki earthquake delineated by on-fault aftershocks<\/strong><\/p>\n<p style=\"text-align: center\">Aitaro Kato\u00a0and\u00a0Toshihiro Igarashi<\/p>\n<p style=\"text-align: center\">Geophys. Res. Lett., 39, L15301, doi:10.1029\/2012GL052220<\/p>\n<p style=\"text-align: left\"><strong>Abstract<\/strong><\/p>\n<p style=\"text-align: left\">Since the 2011 Tohoku-Oki earthquake, many fault source models have been constructed using a variety of data, such as teleseismic, strong ground motion, geodetic, and tsunami recordings. However, questions remain as to how far the associated large-slip zone extended along the plate interface during the rupture. Here we delineate the outer edge of this large-slip zone in detail, based on the sharp density contrast observed for interplate, repeating, and down-dip compressional earthquakes induced by the Tohoku-Oki mainshock. The seismicity rate of interplate earthquakes changed significantly after the mainshock, probably as a result of stress perturbations by the large-slip, and here we use this information as qualitative constraints in constructing our model. The model that we present for the large-slip zone of the Tohoku-Oki earthquake incorporates the main features of previously proposed fault source models, and also the observed fine-scale heterogeneities of fault slip associated with this event. It is important to highlight that the outer edge of this large-slip zone shows a remarkably complex shape. In particular, it is narrow and elongate southward along the ~35\u00a0km iso-depth contour of the plate boundary offshore of Fukushima and Ibaraki. This southward elongate slip zone corresponds to down-dip regions that appear to have produced higher relative levels of short-period seismic radiation.<\/p>\n<p style=\"text-align: center\">\u00a0 \u00a0<a href=\"http:\/\/www.eri.u-tokyo.ac.jp\/old\/wp-content\/outreach-old\/uploads\/2012\/12\/kato_thesis8_1.jpg\"><img loading=\"lazy\" decoding=\"async\" title=\"kato_thesis8_1\" src=\"http:\/\/www.eri.u-tokyo.ac.jp\/old\/wp-content\/outreach-old\/uploads\/2012\/12\/kato_thesis8_1.jpg\" alt=\"\" width=\"441\" height=\"554\" \/><\/a><a href=\"http:\/\/www.eri.u-tokyo.ac.jp\/old\/wp-content\/outreach-old\/uploads\/2012\/12\/kato_thesis8_2.jpg\"><img loading=\"lazy\" decoding=\"async\" title=\"kato_thesis8_2\" src=\"http:\/\/www.eri.u-tokyo.ac.jp\/old\/wp-content\/outreach-old\/uploads\/2012\/12\/kato_thesis8_2.jpg\" alt=\"\" width=\"440\" height=\"513\" \/><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Regional extent of the large coseismic slip zone of the 2011 Mw 9.0 Tohoku-Oki earthquake delineated by on-fau &hellip; <a href=\"https:\/\/www.eri.u-tokyo.ac.jp\/en\/research\/242\/\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;Regional extent of the large coseismic slip zone of the 2011 Mw 9.0 Tohoku-Oki earthquake delineated by on-fault aftershocks&#8221;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11],"tags":[],"class_list":["post-242","post","type-post","status-publish","format-standard","hentry","category-research"],"_links":{"self":[{"href":"https:\/\/www.eri.u-tokyo.ac.jp\/en\/wp-json\/wp\/v2\/posts\/242"}],"collection":[{"href":"https:\/\/www.eri.u-tokyo.ac.jp\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.eri.u-tokyo.ac.jp\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.eri.u-tokyo.ac.jp\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.eri.u-tokyo.ac.jp\/en\/wp-json\/wp\/v2\/comments?post=242"}],"version-history":[{"count":1,"href":"https:\/\/www.eri.u-tokyo.ac.jp\/en\/wp-json\/wp\/v2\/posts\/242\/revisions"}],"predecessor-version":[{"id":243,"href":"https:\/\/www.eri.u-tokyo.ac.jp\/en\/wp-json\/wp\/v2\/posts\/242\/revisions\/243"}],"wp:attachment":[{"href":"https:\/\/www.eri.u-tokyo.ac.jp\/en\/wp-json\/wp\/v2\/media?parent=242"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.eri.u-tokyo.ac.jp\/en\/wp-json\/wp\/v2\/categories?post=242"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.eri.u-tokyo.ac.jp\/en\/wp-json\/wp\/v2\/tags?post=242"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}