{"id":2356,"date":"2020-09-08T09:00:00","date_gmt":"2020-09-08T16:00:00","guid":{"rendered":"https:\/\/dornsife.usc.edu\/news\/stories\/superheated-rocks-deep-underground-help-explain-earthquake-patterns\/"},"modified":"2023-04-19T11:03:31","modified_gmt":"2023-04-19T18:03:31","slug":"superheated-underground-rocks-lead-to-earthquakes","status":"publish","type":"post","link":"https:\/\/dornsife.usc.edu\/news\/stories\/superheated-underground-rocks-lead-to-earthquakes\/","title":{"rendered":"Superheated rocks deep underground help explain earthquake patterns"},"content":{"rendered":"\n\n\n    \n            \n\n  \n    \n\n\n\n\n\n\n<div\n  class=\"cc--component-container cc--article-hero \"\n\n  \n  \n  \n  \n  \n  \n  >\n  <div class=\"c--component c--article-hero\"\n    \n      >\n\n    \n<div class=\"inner-wrapper\">\n          \n<div class=\"f--field f--image\">\n\n    \n    \n    \n    \n    \n    \n              \n      <img\n                            data-src=\"https:\/\/dornsife.usc.edu\/news\/wp-content\/uploads\/sites\/7\/2023\/04\/story-3307-768x432.jpg\"\n          data-srcset=\"https:\/\/dornsife.usc.edu\/news\/wp-content\/uploads\/sites\/7\/2023\/04\/story-3307-768x432.jpg 768w\"          data-sizes=\"(min-width:1200px) 75vw, (min-width:768px) 83vw, 100vw\"          class=\"lazyload\"\n        \n                  alt=\"Superheated rocks deep underground help explain earthquake patterns\"\n        \n        \n                                      \/>\n\n    \n    \n  \n  \n\n<\/div>\n  \n      <div class=\"image-caption\">\n          \n<div class=\"f--field f--description\">\n\n    \n  Cattle graze over the San Andreas Fault in Parkfield, California, the self-proclaimed \u201cearthquake capital of the world.\u201d (Image Source: iStock\/ehughes.)\n\n\n<\/div>\n    <\/div>\n  \n  <div class=\"text-wrapper\">\n          <nav aria-label=\"Breadcrumb\" class=\"breadcrumbs\">\n        <ul>\n                      <li><a href=\"\/news\/stories\/\">News<\/a><\/li>\n                      <li><a href=\"\/news\/stories\/\/?category=faculty\">Faculty<\/a><\/li>\n                  <\/ul>\n      <\/nav>\n    \n              \n<div class=\"f--field f--page-title\">\n\n    \n  <h1>Superheated rocks deep underground help explain earthquake patterns<\/h1>\n\n\n<\/div>\n    \n          <div class=\"subtitle\">\n            \n<div class=\"f--field f--description\">\n\n    \n  By researching tremors under the infamous San Andreas Fault, USC scientists are seeking out what\u2019s brewing beneath a quake\u2019s surface. <strong>[2\u00bc min read]<\/strong>\n\n\n<\/div>\n      <\/div>\n    \n           <strong class=\"author-field\"><span >By<\/span><a href=\"mailto:communication@dornsife.usc.edu\">Gary Polakovic<\/a><\/strong>\n    \n          <span class=\"post-date-field\">September 8, 2020<\/span>\n      <\/div>\n<\/div>\n\n\n  <\/div><\/div>\n\n  \n    \n\n\n\n\n\n\n<div\n  class=\"cc--component-container 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research that helps explain how quakes happen.<\/p>\n<p>The study from the emergent field of earthquake physics looks at temblor mechanics from the bottom up, rather than from the top down, with a focus on underground rocks, friction and fluids.<\/p>\n<p>On the segment of the San Andreas Fault near Parkfield, Calif., underground excitations &mdash; beyond the depths where quakes are typically monitored &mdash; lead to instability that ruptures in a quake.<\/p>\n<p>&ldquo;Most of California seismicity originates from the first 10 miles of the crust, but some tremors on the San Andreas Fault take place much deeper,&rdquo; said <a href=\"https:\/\/dornsife.usc.edu\/cf\/earth\/faculty_display.cfm?Person_ID=1080686\" target=\"_blank\">Sylvain Barbot<\/a>, assistant professor of <a href=\"https:\/\/dornsife.usc.edu\/earth\/\">Earth sciences<\/a> at the USC Dornsife College of Letters, Arts and Sciences. &ldquo;Why and how this happens is largely unknown. We show that a deep section of the San Andreas Fault breaks frequently and melts the host rocks, generating these anomalous seismic waves.&rdquo;<\/p>\n<p>The newly published study appears in <a href=\"https:\/\/advances.sciencemag.org\/\" target=\"_blank\">Science Advances<\/a>.<\/p>\n<p><strong>Trouble in the &ldquo;go-along, get-along&rdquo; phase<\/strong><\/p>\n<p>So what&rsquo;s happening deep in the Earth to explain the rapid quake recurrence?<\/p>\n<p>Using mathematical models and laboratory experiments, the scientists simulated the dynamics of fault activity in the deep Earth spanning 300 years to study a wide range of rupture sizes and behaviors.<\/p>\n<p>The researchers observed that, after a big quake ends, the tectonic plates that meet at the fault boundary settle into a &ldquo;go-along, get-along&rdquo; phase. For a spell, they glide past each other, a slow slip that causes little disturbance to the surface.<\/p>\n<p>But this harmony belies trouble brewing. Gradually, motion across chunks of granite and quartz, the Earth&rsquo;s bedrock, generates heat due to friction. When friction pushes temperatures above 650 degrees Fahrenheit, the rock blocks grow less solid and more fluidlike. They start to slide more, generating more friction, more heat and more fluids until they slip past each other rapidly &mdash; triggering an earthquake.<\/p>\n<p>&ldquo;Just like rubbing our hands together in cold weather to heat them up, faults heat up when they slide,&rdquo; Barbot said.<\/p>\n<p>It&rsquo;s a different way of looking at the San Andreas Fault. Scientists typically focus on movement in the top of Earth&rsquo;s crust, anticipating that its motion, in turn, rejiggers the rocks deep below. For this study, the scientists looked at the problem from the bottom up.<\/p>\n<p>&ldquo;It&rsquo;s difficult to make predictions,&rdquo; Barbot added, &ldquo;so instead of predicting just earthquakes, we&rsquo;re trying to explain all of the different types of motion seen in the ground.&rdquo;<\/p>\n<p><i><a href=\"https:\/\/news.usc.edu\/175102\/earthquake-patterns-usc-research-tremors-san-andreas-fault\/\" target=\"_blank\">See USC News for the full story &gt;&gt;<\/a><\/i><\/p>\n\n\n\n<\/div>\n\n\n  <\/div><\/div>\n","protected":false},"excerpt":{"rendered":"<p>By researching tremors under the infamous San Andreas Fault, USC scientists are seeking out what\u2019s brewing beneath a quake\u2019s surface. <strong>[2\u00bc min read]<\/strong><\/p>\n","protected":false},"author":0,"featured_media":2359,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[10],"tags":[159,207,208],"class_list":["post-2356","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-faculty","tag-earth-sciences","tag-earthquakes","tag-sylvain-barbot"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.1.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Superheated rocks deep underground help explain earthquake patterns<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/dornsife.usc.edu\/news\/stories\/superheated-underground-rocks-lead-to-earthquakes\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Superheated rocks deep underground help explain earthquake patterns\" \/>\n<meta property=\"og:description\" content=\"By researching tremors under the infamous San Andreas Fault, USC scientists are seeking out what\u2019s brewing beneath a quake\u2019s surface. 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