\u201cCajon Pass is a structurally complex junction,\u201d says Burkhard, \u201cwhere multiple geological factors combine to create gate-like behavior.\u201d<\/p>\n
To conduct their study, Burkhard and her colleagues surveyed existing data of both tree-ring analysis and radiocarbon dating of preserved sediment, reaching back 1,000 years in the geological record. When it came to the sediment, they looked particularly at displaced regions\u2014spots where the ground once shifted and cracked. Tree rings were more complex. Quakes can leave trees standing at irregular angles, uproot them entirely, and disturb their drainage patterns. Such stressors can lead to a narrowing of the rings.<\/p>\n
\u201cBy precisely dating these anomalies which acts as a natural calendar going back centuries,\u201d Burkhard says, \u201cscientists can identify years in which a major seismic event likely occurred in the region.\u201d<\/p>\n
The researchers fed this millennium-long data into a computer model to determine how much stress has built up along the faults in that temporal window. The conclusion: there has been little tree ring or sediment evidence in the geologically recent record, meaning the San Andreas and San Jacinto systems are loaded to blow\u2014more stressed than they\u2019ve been since the 11th century.<\/p>\n","protected":false},"excerpt":{"rendered":"\u201cCajon Pass is a structurally complex junction,\u201d says Burkhard, \u201cwhere multiple geological factors combine to create gate-like behavior.\u201d…\n","protected":false},"author":2,"featured_media":365948,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[7,9,8],"class_list":["post-365947","post","type-post","status-publish","format-standard","has-post-thumbnail","category-california","tag-california","tag-california-headlines","tag-california-news"],"_links":{"self":[{"href":"https:\/\/www.newsbeep.com\/us-ca\/wp-json\/wp\/v2\/posts\/365947","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.newsbeep.com\/us-ca\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.newsbeep.com\/us-ca\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/us-ca\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/us-ca\/wp-json\/wp\/v2\/comments?post=365947"}],"version-history":[{"count":0,"href":"https:\/\/www.newsbeep.com\/us-ca\/wp-json\/wp\/v2\/posts\/365947\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/us-ca\/wp-json\/wp\/v2\/media\/365948"}],"wp:attachment":[{"href":"https:\/\/www.newsbeep.com\/us-ca\/wp-json\/wp\/v2\/media?parent=365947"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.newsbeep.com\/us-ca\/wp-json\/wp\/v2\/categories?post=365947"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.newsbeep.com\/us-ca\/wp-json\/wp\/v2\/tags?post=365947"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}