{"id":1996,"date":"2014-09-17T07:54:55","date_gmt":"2014-09-17T15:54:55","guid":{"rendered":"http:\/\/earthjay.com\/?p=1996"},"modified":"2014-09-17T07:54:55","modified_gmt":"2014-09-17T15:54:55","slug":"earthquake-near-guam","status":"publish","type":"post","link":"https:\/\/earthjay.com\/?p=1996","title":{"rendered":"Earthquake near Guam!"},"content":{"rendered":"

Last night (Pacific Time) there was a M 6.7 earthquake in the western Pacific near Guam. Here<\/a> is the USGS page for the earthquake. The depth is about 137 km, so it is unlikely to generate a tsunami. Also, the depth reduces the likelihood of damage from ground shaking.
\nHere is a map showing the global tectonics. The epicenter is west of the Marianas Trench, which is formed by subduction of the Pacific plate beneath the Philippine plate. Note there is a spreading ridge east of the epicenter.
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\nHere is a map showing the global tectonics along with the historic seismicity.
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\nHere is a regional map showing the epicenter as it relates to Guam (the city Hagatna is labelled) and Saipan.
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\nHere is a regional map showing the historic earthquakes.
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\nThis map shows the modeled Modified Mercalli Shaking Intensity (contours), along with the Did You Feel It results (colors on the islands). The MMI contours are generated by a computer model. The DYFI data are the results of observations made by real people.
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\nThis is the Moment Tensor from the USGS website. This shows that the earthquake is a “normal” earthquake, caused by extension in the Earth’s crust. Based on the location of this earthquake, it is probably located in the downgoing Pacific plate.
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\nHere is a primer about Focal Mechanisms from the USGS<\/a>.
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\nThis is the Pager Page, which shows the probability of damage to people and their infrastructure. These are generated by a computer model and are updated regularly following an earthquake as more seismological information is used to refine the earthquake shaking\/intensity models. This one is version 2 and probably wont be updated.
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\nHere is the regional tectonic map produced by the USGS. Historic earthquakes, tectonic plate boundaries, and downgoing plate slab contours are plotted.
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\nHere is a map that shows the bathymetry (the shape and depths of the seafloor) in this region, as determined by Smith and Sandwell at Scripps Institute of Oceanography<\/a>. Depth contours are 500 meters.
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\nHere is a regional map showing the depth contours of the dowgoing Pacific plate, as generated by Gavin Hayes from the USGS<\/a>.
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\nReferences:
\nHayes, G. P., D. J. Wald, and R. L. Johnson (2012), Slab1.0: A three-dimensional model of global subduction zone geometries, J. Geophys. Res., 117, B01302, doi:10.1029\/2011JB008524.
\nSmith, W. H. F., and D. T. Sandwell, Global seafloor topography from satellite altimetry and ship depth soundings, Science, v. 277, p. 1957-1962, 26 Sept., 1997.<\/p>\n","protected":false},"excerpt":{"rendered":"

\nLast night (Pacific Time) there was a M 6.7 earthquake in the western Pacific near Guam. Here is the USGS page for the earthquake. The depth is about 137 km, so it is unlikely to generate a tsunami. Also, the…\n<\/div>\n
Continue reading “Earthquake near Guam!”<\/span>…<\/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":[50,5,6,7,27,34,38],"tags":[],"aioseo_notices":[],"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/earthjay.com\/index.php?rest_route=\/wp\/v2\/posts\/1996"}],"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=1996"}],"version-history":[{"count":0,"href":"https:\/\/earthjay.com\/index.php?rest_route=\/wp\/v2\/posts\/1996\/revisions"}],"wp:attachment":[{"href":"https:\/\/earthjay.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1996"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/earthjay.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1996"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/earthjay.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1996"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}