{"id":2168,"date":"2015-02-16T21:41:33","date_gmt":"2015-02-17T05:41:33","guid":{"rendered":"http:\/\/earthjay.com\/?p=2168"},"modified":"2015-02-16T21:41:33","modified_gmt":"2015-02-17T05:41:33","slug":"ne-japan-aftershocks-continue-offshore-the-sanriku-coast","status":"publish","type":"post","link":"https:\/\/earthjay.com\/?p=2168","title":{"rendered":"NE Japan aftershocks continue offshore the Sanriku coast"},"content":{"rendered":"<p>There continue to be aftershocks in the M 4-5 range. These are aftershocks and triggered earthquakes (if they are generally on different faults) from the Mw 6.7 earthquake. <a href=\"http:\/\/earthjay.com\/?p=2154\" target=\"_blank\" rel=\"noopener noreferrer\">Here is my page<\/a> on this mainshock and <a href=\"http:\/\/earthquake.usgs.gov\/earthquakes\/eventpage\/usb000tpvj#general_summary\" target=\"_blank\" rel=\"noopener noreferrer\">here is the USGS page<\/a> for the mainshock. <a href=\"http:\/\/earthquake.usgs.gov\/earthquakes\/eventpage\/usb000tpy8#general_summary\" target=\"_blank\" rel=\"noopener noreferrer\">Here is the USGS page<\/a> for a triggered earthquake (unlikely on the same fault), a M 5.8 earthquake.<br \/>\n<strong>There are several report updates, listed here:<\/strong><\/p>\n<ul>\n<li>2015.02.16 <a href=\"http:\/\/earthjay.com\/?p=2154\">M 6.7 Japan<\/a> Sanriku Coast &#8211; Main Report<\/li>\n<li>2015.02.16 <a href=\"http:\/\/earthjay.com\/?p=2168\">M 6.7 Japan<\/a> Sanriku Coast Update #1<\/li>\n<li>2015.02.16 <a href=\"http:\/\/earthjay.com\/?p=2174\">M 6.7 Japan<\/a> Sanriku Coast Update #2<\/li>\n<li>2015.02.20 <a href=\"http:\/\/earthjay.com\/?p=2183\">M 6.7 Japan<\/a> Sanriku Coast Update #3<\/li>\n<li>2015.02.21 <a href=\"http:\/\/earthjay.com\/?p=2187\">M 6.7 Japan<\/a> Sanriku Coast Update #4<\/li>\n<li>2015.02.25 <a href=\"http:\/\/earthjay.com\/?p=2197\">M 6.3 Japan<\/a> Sanriku Coast Update #5<\/li>\n<\/ul>\n<p>Here is a map showing the most recent assemblage of these aftershocks.<br \/>\n<a href=\"http:\/\/earthjay.com\/earthquakes\/20150216_japan\/20150216_japan_map_local_aftershocks_2130.JPG\" target=\"_blank\" rel=\"noopener noreferrer\"><br \/>\n<img decoding=\"async\" src=\"http:\/\/earthjay.com\/earthquakes\/20150216_japan\/20150216_japan_map_local_aftershocks_2130.JPG\" width=\"100%\" alt=\"\" \/><\/a><br \/>\nThis M 5.8 earthquake is located closer to land, but it is a much smaller earthquake. These two factors combine to have similar shaking intensity at the coast. Each step in magnitude (e.g. from M = 5 to M = 6) the energy released (strain) is 33 times more. So a M = 6 earthquake releases 33 times more energy than a M = 6.<br \/>\nHere is a map for the larger earthquake.<br \/>\n<a href=\"http:\/\/earthjay.com\/earthquakes\/20150216_japan\/20150216_japan_map_dyfi.pdf\" target=\"_blank\" rel=\"noopener noreferrer\"><br \/>\n<img decoding=\"async\" src=\"http:\/\/earthjay.com\/earthquakes\/20150216_japan\/20150216_japan_map_dyfi.jpg\" width=\"100%\" alt=\"\" \/><\/a><br \/>\nHere is a map for the smaller earthquake.<br \/>\n<a href=\"http:\/\/earthjay.com\/earthquakes\/20150216_japan\/20150216_japan_map_dyfi_M58.pdf\" target=\"_blank\" rel=\"noopener noreferrer\"><br \/>\n<img decoding=\"async\" src=\"http:\/\/earthjay.com\/earthquakes\/20150216_japan\/20150216_japan_map_dyfi_M58.jpg\" width=\"100%\" alt=\"\" \/><\/a><br \/>\nHere is the attenuation plot for the larger earthquake. Note how these reports match well with the western US attenuation (GMPE) model.<br \/>\n<a href=\"http:\/\/earthjay.com\/earthquakes\/20150216_japan\/20150216_japan_atten.jpg\" target=\"_blank\" rel=\"noopener noreferrer\"><br \/>\n<img decoding=\"async\" src=\"http:\/\/earthjay.com\/earthquakes\/20150216_japan\/20150216_japan_atten.jpg\" width=\"100%\" alt=\"\" \/><\/a><br \/>\nHere is the attenuation plot for the smaller earthquake.<br \/>\n<a href=\"http:\/\/earthjay.com\/earthquakes\/20150216_japan\/20150216_japan_atten_M58.jpg\" target=\"_blank\" rel=\"noopener noreferrer\"><br \/>\n<img decoding=\"async\" src=\"http:\/\/earthjay.com\/earthquakes\/20150216_japan\/20150216_japan_atten_M58.jpg\" width=\"100%\" alt=\"\" \/><\/a><br \/>\nFurther demonstrating how magnitude and distance relate between these two different earthquakes are the pager model results. These are modeled estimates of damage to people and their belongings (roads, houses, etc.).<br \/>\nThis is the pager report for the larger earthquake.<br \/>\n<a href=\"http:\/\/earthjay.com\/earthquakes\/20150216_japan\/20150216_japan_pager.pdf\" target=\"_blank\" rel=\"noopener noreferrer\"><br \/>\n<img decoding=\"async\" src=\"http:\/\/earthjay.com\/earthquakes\/20150216_japan\/20150216_japan_pager.jpg\" width=\"100%\" alt=\"\" \/><\/a><br \/>\nThis is the pager plot for the smaller earthquake. Note how the probability estimates for damage are similar.<br \/>\n<a href=\"http:\/\/earthjay.com\/earthquakes\/20150216_japan\/20150216_japan_pager_M58.pdf\" target=\"_blank\" rel=\"noopener noreferrer\"><br \/>\n<img decoding=\"async\" src=\"http:\/\/earthjay.com\/earthquakes\/20150216_japan\/20150216_japan_pager_M58.jpg\" width=\"100%\" alt=\"\" \/><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<div class=\"entry-summary\">\nThere continue to be aftershocks in the M 4-5 range. These are aftershocks and triggered earthquakes (if they are generally on different faults) from the Mw 6.7 earthquake. Here is my page on this mainshock and here is the USGS&hellip;\n<\/div>\n<div class=\"link-more\"><a href=\"https:\/\/earthjay.com\/?p=2168\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &ldquo;NE Japan aftershocks continue offshore the Sanriku coast&rdquo;<\/span>&hellip;<\/a><\/div>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0},"categories":[49,5,6,7,27,34,38],"tags":[],"aioseo_notices":[],"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/earthjay.com\/index.php?rest_route=\/wp\/v2\/posts\/2168"}],"collection":[{"href":"https:\/\/earthjay.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/earthjay.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/earthjay.com\/index.php?rest_route=\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/earthjay.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2168"}],"version-history":[{"count":0,"href":"https:\/\/earthjay.com\/index.php?rest_route=\/wp\/v2\/posts\/2168\/revisions"}],"wp:attachment":[{"href":"https:\/\/earthjay.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2168"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/earthjay.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2168"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/earthjay.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2168"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}