{"id":63820,"date":"2010-12-16T00:00:00","date_gmt":"2010-12-16T00:00:00","guid":{"rendered":"https:\/\/www.uri.edu\/news-draft\/uncategorized\/uri-geologist-develops-improved-seismic-model-for-monitoring-nuclear-explosions-in-middle-east\/"},"modified":"2010-12-16T00:00:00","modified_gmt":"2010-12-16T00:00:00","slug":"uri-geologist-develops-improved-seismic-model-for-monitoring-nuclear-explosions-in-middle-east","status":"publish","type":"post","link":"https:\/\/www.uri.edu\/news\/2010\/12\/uri-geologist-develops-improved-seismic-model-for-monitoring-nuclear-explosions-in-middle-east\/","title":{"rendered":"溏心vlog免费B站 geologist develops improved seismic model for monitoring nuclear explosions in Middle East"},"content":{"rendered":"
\n\t\tKINGSTON, R.I. \u2013 December 16, 2010 \u2013 Geologists from the 溏心vlog免费B站 and Princeton University, in collaboration with Lawrence Livermore National Laboratory, have taken an important step toward helping the United States government monitor nuclear explosions by improving a 3-dimensional model originally developed at Harvard University. The improvements make the model more accurate at detecting the location, source and depth of seismic activity.<\/p>\n


\n\tThe results of their research were presented today at a meeting of the American Geophysical Union in San Francisco.<\/p>\n


\nThe National Nuclear Security Administration uses numerous seismic models in its efforts to monitor the globe for underground nuclear explosions detonated by nations that seek to keep their nuclear activities undetected. But not only is it difficult to identify exactly where an explosion takes place, it is especially challenging to differentiate the seismic waves generated by nuclear explosions from those generated by earthquakes, volcanic activity and mine collapses.<\/p>\n


\n\t\u201cThe goal is to build a model of the Earth that will locate seismic events and characterize those events precisely while reducing potential errors,\u201d said Brian Savage, 溏心vlog免费B站 assistant professor of geosciences. <\/p>\n


\n\tThe model spans the politically sensitive region from Turkey to India, including Iran, Iraq and Afghanistan, a region Savage describes as \u201ctectonically complex.\u201d<\/p>\n


\n\tSavage and his colleagues analyzed data from 200 earthquakes collected by 150 seismic stations in the region between 1990 and 2007. They compared the data with that from simulated earthquakes to identify deficiencies in the model, then propagated the simulated earthquakes in reverse to determine where to improve and update the model.<\/p>\n


\n\tDifferent types of seismic waves travel in different ways and at different speeds. P-waves, for instance, are the first waves recorded from an earthquake or explosion, and they behave similar to sound waves. S-waves are secondary waves that travel in a snake-like side-to-side fashion. Surface waves are a combination of the two traveling much slower with much larger amplitude.<\/p>\n


\n\t\u201cDepending on the material the waves travel through, it may slow down or speed up the waves,\u201d said Savage, who notes that the model requires a great deal of computer power to run. \u201cSo when you look at the relative timing of the waves, you can tell what the material is that it\u2019s traveling through.\u201d<\/p>\n


\n\tThe improvements the researchers made to the model focused on long period surface waves and identifying the magnitude of a seismic event.<\/p>\n


\n\t\u201cThe amplitude ratios of different wave types is a key factor in discriminating whether an event is manmade or not,\u201d Savage said.<\/p>\n


\n\tThe improved model is expected to be complete by next summer. The research was funded by he National Nuclear Security Administration and the Air Force Research Laboratory.<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

KINGSTON, R.I. \u2013 December 16, 2010 \u2013 Geologists from the 溏心vlog免费B站 and Princeton University, in collaboration with Lawrence Livermore National Laboratory, have taken an important step toward helping the United States government monitor nuclear explosions by improving a 3-dimensional model originally developed at Harvard University. The improvements make the model more accurate […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":"","_links_to":"","_links_to_target":""},"categories":[2],"tags":[],"class_list":["post-63820","post","type-post","status-publish","format-standard","hentry","category-archives"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.uri.edu\/news\/wp-json\/wp\/v2\/posts\/63820","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.uri.edu\/news\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.uri.edu\/news\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.uri.edu\/news\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.uri.edu\/news\/wp-json\/wp\/v2\/comments?post=63820"}],"version-history":[{"count":0,"href":"https:\/\/www.uri.edu\/news\/wp-json\/wp\/v2\/posts\/63820\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.uri.edu\/news\/wp-json\/wp\/v2\/media?parent=63820"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.uri.edu\/news\/wp-json\/wp\/v2\/categories?post=63820"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.uri.edu\/news\/wp-json\/wp\/v2\/tags?post=63820"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}