{"id":232,"date":"2013-05-27T03:34:34","date_gmt":"2013-05-26T18:34:34","guid":{"rendered":"http:\/\/www.eri.u-tokyo.ac.jp\/_html\/en\/?p=232"},"modified":"2016-04-14T16:54:00","modified_gmt":"2016-04-14T07:54:00","slug":"global-propagation-of-body-waves-revealed-by-cross-correlation-analysis-of-seismic-hum","status":"publish","type":"post","link":"https:\/\/www.eri.u-tokyo.ac.jp\/en\/research\/232\/","title":{"rendered":"Global propagation of body waves revealed by cross-correlation analysis of seismic hum"},"content":{"rendered":"<p style=\"text-align: center\"><strong>Global propagation of body waves revealed by cross-correlation analysis of seismic hum<\/strong><\/p>\n<p style=\"text-align: center\">K. Nishida<\/p>\n<p style=\"text-align: center\">Geophys. Res. Lett., 2013, DOI: 10.1002\/grl.50269<\/p>\n<p style=\"text-align: left\"><strong>Abstract<\/strong><\/p>\n<p style=\"text-align: left\">Seismic interferometry has now been applied to the exploration of the Earth&#8217;s interior at scales ranging from local to global. Most studies have used surface-wave propagation. Recently, some studies have focused on body wave propagation on local and regional scales but not on a global scale. In this study, we succeed in extracting global body wave propagation(of <em>P<\/em>, <em>PP<\/em>, <em>PKP<\/em>, <em>S<\/em>, <em>SS<\/em>, <em>S<\/em><em>c<\/em><em>S<\/em>, <em>P<\/em><sup>\u2032<\/sup><em>P<\/em><sup>\u2032<\/sup>, etc. waves) using seismic hum with frequency-wave number filtering in the range of 5 to 40\u2009mHz. Although the observed body wave propagation is similar to that of the corresponding components of Green&#8217;s functions, there are two differences between them: the lack of reflection phases in the observation and the dominance of shear-coupled <em>PL<\/em> waves in the observation. These differences originate from the dominance of shear-traction sources on the Earth&#8217;s surface, which causes the breakdown of equipartition among modes with different radial orders. For further studies of body wave exploration by seismic interferometry, these differences should be considered.<\/p>\n<p style=\"text-align: center\"><a href=\"http:\/\/www.eri.u-tokyo.ac.jp\/old\/wp-content\/outreach-old\/uploads\/2013\/04\/Fig1.jpg\"><img loading=\"lazy\" decoding=\"async\" title=\"Fig1\" src=\"http:\/\/www.eri.u-tokyo.ac.jp\/old\/wp-content\/outreach-old\/uploads\/2013\/04\/Fig1-300x278.jpg\" alt=\"\" width=\"300\" height=\"278\" \/><\/a><a href=\"http:\/\/www.eri.u-tokyo.ac.jp\/old\/wp-content\/outreach-old\/uploads\/2013\/04\/Fig2.jpg\"><img loading=\"lazy\" decoding=\"async\" title=\"Fig2\" src=\"http:\/\/www.eri.u-tokyo.ac.jp\/old\/wp-content\/outreach-old\/uploads\/2013\/04\/Fig2-420x420.jpg\" alt=\"\" width=\"420\" height=\"420\" \/><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Global propagation of body waves revealed by cross-correlation analysis of seismic hum K. Nishida Geophys. Res &hellip; <a href=\"https:\/\/www.eri.u-tokyo.ac.jp\/en\/research\/232\/\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;Global propagation of body waves revealed by cross-correlation analysis of seismic hum&#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-232","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\/232"}],"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=232"}],"version-history":[{"count":1,"href":"https:\/\/www.eri.u-tokyo.ac.jp\/en\/wp-json\/wp\/v2\/posts\/232\/revisions"}],"predecessor-version":[{"id":234,"href":"https:\/\/www.eri.u-tokyo.ac.jp\/en\/wp-json\/wp\/v2\/posts\/232\/revisions\/234"}],"wp:attachment":[{"href":"https:\/\/www.eri.u-tokyo.ac.jp\/en\/wp-json\/wp\/v2\/media?parent=232"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.eri.u-tokyo.ac.jp\/en\/wp-json\/wp\/v2\/categories?post=232"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.eri.u-tokyo.ac.jp\/en\/wp-json\/wp\/v2\/tags?post=232"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}