{"id":196,"date":"2015-06-29T18:23:22","date_gmt":"2015-06-29T09:23:22","guid":{"rendered":"http:\/\/www.eri.u-tokyo.ac.jp\/_html\/en\/?p=196"},"modified":"2016-04-14T17:08:41","modified_gmt":"2016-04-14T08:08:41","slug":"imaging-crust-and-upper-mantle-beneath-mount-fuji-japan-by-receiver-functions","status":"publish","type":"post","link":"https:\/\/www.eri.u-tokyo.ac.jp\/en\/research\/196\/","title":{"rendered":"Imaging crust and upper mantle beneath Mount Fuji, Japan, by receiver functions"},"content":{"rendered":"<p style=\"text-align: center\">S. M. Kinoshita, T. Igarashi, Y. Aoki, and M. Takeo (Earthquake Research Institute, University of Tokyo) J.Geophys.Res.Solid Earth, 120, doi:10.1002\/2014JB011522.<\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: center\">\n<p><strong>Abstract<\/strong><\/p>\n<p>\nMount Fuji has ejected a huge amount of basaltic products during the last 100,000 years. Even<br \/>\nthough the region around Mount Fuji is tectonically active, the seismicity below Mount Fuji is low, resulting in<br \/>\nlittle knowledge about the seismic structure there. To gain more insight into the magma-plumbing system,<br \/>\nwe obtain the seismic structure beneath Mount Fuji by the receiver function (RF) technique. RFs at seismic<br \/>\nstations around Mount Fuji show positive phases at ~3 and ~6 s, representing the conversion of P to S waves<br \/>\nat a positive velocity boundary in the Philippine Sea plate. Cross sections of RF amplitudes reveal two distinct<br \/>\nvelocity boundaries around Mount Fuji, at depths of 40\u201350 km and 20\u201330 km, which we interpret to be the<br \/>\nboundary between the crust-mantle transition layer and the uppermost mantle of the Izu-Bonin arc and the<br \/>\nvelocity discontinuity just below the region where low-frequency earthquakes (LFEs) of Mount Fuji have<br \/>\noccurred, respectively. The velocity boundary at about 50 km depth shows a clear gap just beneath Mount<br \/>\nFuji. We suggest that this gap represents a weaker velocity contrast zone through which the magma of Mount<br \/>\nFuji ascends from the Pacific plate. A thorough grid search reveals that a low-velocity zone at depths of<br \/>\n~13\u201326 km explains all the characteristics of RFs around Mount Fuji, leading us to interpret the high-velocity<br \/>\nboundary just below the LFE region as the lower boundary of Mount Fuji\u2019s magma chamber.\n<\/p>\n<\/pre>\n<figure id=\"attachment_1585\" aria-describedby=\"caption-attachment-1585\" style=\"width: 300px\" class=\"wp-caption alignnone\"><a href=\"http:\/\/www.eri.u-tokyo.ac.jp\/old\/en\/wp-content\/uploads\/sites\/3\/2015\/06\/Figure3.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-1585\" src=\"http:\/\/www.eri.u-tokyo.ac.jp\/old\/en\/wp-content\/uploads\/sites\/3\/2015\/06\/Figure3-300x133.jpg\" alt=\"Figure 1. Schematic illustrations of the crust and upper mantle structure beneath Mount Fuji along the N-S\" width=\"300\" height=\"133\" \/><\/a><figcaption id=\"caption-attachment-1585\" class=\"wp-caption-text\">Figure 1. Schematic illustrations of the crust and upper mantle structure beneath Mount Fuji along the N-S<\/figcaption><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>S. M. Kinoshita, T. Igarashi, Y. Aoki, and M. Takeo (Earthquake Research Institute, University of Tokyo) J.Geo &hellip; <a href=\"https:\/\/www.eri.u-tokyo.ac.jp\/en\/research\/196\/\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;Imaging crust and upper mantle beneath Mount Fuji, Japan, by receiver functions&#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-196","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\/196"}],"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=196"}],"version-history":[{"count":1,"href":"https:\/\/www.eri.u-tokyo.ac.jp\/en\/wp-json\/wp\/v2\/posts\/196\/revisions"}],"predecessor-version":[{"id":197,"href":"https:\/\/www.eri.u-tokyo.ac.jp\/en\/wp-json\/wp\/v2\/posts\/196\/revisions\/197"}],"wp:attachment":[{"href":"https:\/\/www.eri.u-tokyo.ac.jp\/en\/wp-json\/wp\/v2\/media?parent=196"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.eri.u-tokyo.ac.jp\/en\/wp-json\/wp\/v2\/categories?post=196"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.eri.u-tokyo.ac.jp\/en\/wp-json\/wp\/v2\/tags?post=196"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}