{"618403":{"#nid":"618403","#data":{"type":"event","title":"PhD Defense by Tiegan Hobbs","body":[{"value":"\u003Cp\u003ECOLLEGE OF SCIENCES\u003Cbr \/\u003E\r\nSCHOOL OF EARTH AND\u003Cbr \/\u003E\r\nATMOSPHERIC SCIENCES\u003Cbr \/\u003E\r\nEAS Ph.D. Defense\u003Cbr \/\u003E\r\nTiegan Hobbs\u003Cbr \/\u003E\r\nMarch 8,\u003Cbr \/\u003E\r\n2019\u003Cbr \/\u003E\r\n3:00 PM\u003Cbr \/\u003E\r\nEarth and Atmospheric Sciences\u003Cbr \/\u003E\r\nFord Environmental Science \u0026amp;\u003Cbr \/\u003E\r\nTechnology (ES\u0026amp;T)\u003Cbr \/\u003E\r\n311 Ferst Drive, ES\u0026amp;T\u003Cbr \/\u003E\r\nAtlanta, GA 30332-0340\u003Cbr \/\u003E\r\nWeb: eas.gatech.edu\u003Cbr \/\u003E\r\nES\u0026amp;T\u003Cbr \/\u003E\r\nL1255\u003Cbr \/\u003E\r\nTitle: Postseismic Response Following the 2012 Mw 7.6 Nicoya, Costa Rica\u003Cbr \/\u003E\r\nEarthquake\u003Cbr \/\u003E\r\nCommittee members: Dr. Andrew Newman (Advisor), Dr. Zhigang Peng,\u003Cbr \/\u003E\r\nDr. J. David Frost, Dr. Marino Protti, Dr. Timothy Dixon\u003Cbr \/\u003E\r\nAbstract: Characterization of the surface deformation related to the 2012\u003Cbr \/\u003E\r\nmoment magnitude (Mw) 7.6 Nicoya earthquake was undertaken using\u003Cbr \/\u003E\r\ncontinuous and campaign Global Positioning System (GPS) observations. This\u003Cbr \/\u003E\r\nlocation is uniquely situated to monitor megathrust conditions as the peninsula\u003Cbr \/\u003E\r\nextends to within 60 km of the trench. The entirety of the postseismic and\u003Cbr \/\u003E\r\nrelocking period were considered, totaling 5 years. Seismic observations were\u003Cbr \/\u003E\r\nalso included, to cumulatively elucidate the timing and spatial extent of\u003Cbr \/\u003E\r\nmegathrust behavior. Afterslip with equivalent Mw of 7.5 was shown to exist in\u003Cbr \/\u003E\r\npatches that were distinct from aftershocks, both of which were most abundant\u003Cbr \/\u003E\r\nimmediately updip of the coseismic rupture patch. This was an important, albeit\u003Cbr \/\u003E\r\nfailed, test of the applicability of using repeating aftershocks as a proxy for slip.\u003Cbr \/\u003E\r\nAs trench-normal afterslip waned, relocking was initiated but shortly interrupted\u003Cbr \/\u003E\r\nby a period of exclusively trench-parallel motion across the Nicoya forearc. This\u003Cbr \/\u003E\r\nwas a novel observation. Combined with results of a backslip inversion, these\u003Cbr \/\u003E\r\nfindings suggest that slip partitioning may be controlled by megathrust coupling.\u003Cbr \/\u003E\r\nBy 2016 the surface velocities returned to preseismic levels, indicating a return\u003Cbr \/\u003E\r\nto stable interseismic conditions. These results, and their impact on active\u003Cbr \/\u003E\r\ntectonics and subduction physics, are discussed.\u003C\/p\u003E\r\n","summary":null,"format":"limited_html"}],"field_subtitle":"","field_summary":"","field_summary_sentence":[{"value":"Postseismic Response Following the 2012 Mw 7.6 Nicoya, Costa Rica Earthquake"}],"uid":"27707","created_gmt":"2019-02-25 16:49:20","changed_gmt":"2019-02-25 16:49:20","author":"Tatianna Richardson","boilerplate_text":"","field_publication":"","field_article_url":"","field_event_time":{"event_time_start":"2019-03-08T15:00:00-05:00","event_time_end":"2019-03-08T17:00:00-05:00","event_time_end_last":"2019-03-08T17:00:00-05:00","gmt_time_start":"2019-03-08 20:00:00","gmt_time_end":"2019-03-08 22:00:00","gmt_time_end_last":"2019-03-08 22:00:00","rrule":null,"timezone":"America\/New_York"},"extras":[],"groups":[{"id":"221981","name":"Graduate Studies"}],"categories":[],"keywords":[{"id":"100811","name":"Phd Defense"}],"core_research_areas":[],"news_room_topics":[],"event_categories":[{"id":"1788","name":"Other\/Miscellaneous"}],"invited_audience":[{"id":"78761","name":"Faculty\/Staff"},{"id":"78771","name":"Public"},{"id":"78751","name":"Undergraduate students"}],"affiliations":[],"classification":[],"areas_of_expertise":[],"news_and_recent_appearances":[],"phone":[],"contact":[],"email":[],"slides":[],"orientation":[],"userdata":""}}}