{"615337":{"#nid":"615337","#data":{"type":"event","title":"Grain Scale Physics of Plate Boundaries: Tectonic Processes from Geological to Human Time Scales","body":[{"value":"\u003Ch4\u003E\u003Cstrong\u003EThe School of Earth and Atmospheric Sciences Presents Dr. Elvira Mulyukova, Yale University\u003C\/strong\u003E\u003C\/h4\u003E\r\n\r\n\u003Cp\u003EGrain Scale Physics of Plate Boundaries: Tectonic Processes from Geological to Human Time Scales\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;The motion of tectonic plates along our planet\u0026rsquo;s surface shapes the\u0026nbsp;relationship between the solid Earth and its surrounding elements,\u0026nbsp;including the atmosphere, ocean, and life.\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003EExamples include the chemical\u0026nbsp;reactions between minerals and water at seafloor spreading centers, as well as volcanic degassing at subduction zones, both of which link plate\u0026nbsp;tectonics to the global volatile cycles. Furthermore, volcanism and\u0026nbsp;seismicity along plate boundaries have a clear impact on human life.\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003EHowever, Earth is enigmatic in that it is the only known terrestrial\u0026nbsp;body that has plate tectonics. Understanding how plates and plate\u0026nbsp;boundaries form and evolve is fundamental to our understanding of the\u0026nbsp;Earth system as a whole.\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003EIn order for a new tectonic plate to form, the\u0026nbsp;cold and stiff oceanic lithosphere must be weakened sufficiently to\u0026nbsp;deform at tectonic rates. The weakening mechanisms involve the\u0026nbsp;microscale physics of mineral grains and their control on the strength\u0026nbsp;of the lithosphere.\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003EIn this talk, I will present the microphysics of\u0026nbsp;lithospheric weakening by mineral grain size reduction, known as grain\u0026nbsp;damage, and its application to tectonic scale processes, such as\u0026nbsp;subduction initiation.\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003EI will also present the newly developed theory of\u0026nbsp;grain mechanics, which couples evolution of grain size and intragranular\u0026nbsp;defects. The new model predicts oscillations in grain size, and possibly\u0026nbsp;material strength, on a time scale that is relevant to earthquake cycles\u0026nbsp;and postseismic recovery, thus connecting plate boundary formation\u0026nbsp;processes to the human time scale.\u003C\/p\u003E\r\n","summary":null,"format":"limited_html"}],"field_subtitle":"","field_summary":"","field_summary_sentence":[{"value":"A seminar by Dr. Elvira Mulyukova, School of Earth and Atmospheric Sciences"}],"uid":"34458","created_gmt":"2018-12-13 17:51:37","changed_gmt":"2019-01-17 15:26:09","author":"nlawson3","boilerplate_text":"","field_publication":"","field_article_url":"","field_event_time":{"event_time_start":"2019-01-24T11:00:00-05:00","event_time_end":"2019-01-24T11:50:00-05:00","event_time_end_last":"2019-01-24T11:50:00-05:00","gmt_time_start":"2019-01-24 16:00:00","gmt_time_end":"2019-01-24 16:50:00","gmt_time_end_last":"2019-01-24 16:50:00","rrule":null,"timezone":"America\/New_York"},"extras":[],"hg_media":{"615321":{"id":"615321","type":"image","title":"Elvira Mulyukova","body":null,"created":"1544718673","gmt_created":"2018-12-13 16:31:13","changed":"1544718673","gmt_changed":"2018-12-13 16:31:13","alt":"","file":{"fid":"234303","name":"E. Mulyukova.jpg","image_path":"\/sites\/default\/files\/images\/E.%20Mulyukova.jpg","image_full_path":"http:\/\/hg.gatech.edu\/\/sites\/default\/files\/images\/E.%20Mulyukova.jpg","mime":"image\/jpeg","size":3726,"path_740":"http:\/\/hg.gatech.edu\/sites\/default\/files\/styles\/740xx_scale\/public\/images\/E.%20Mulyukova.jpg?itok=Z4BHnRql"}}},"media_ids":["615321"],"groups":[{"id":"364801","name":"School of Earth and Atmospheric Sciences (EAS)"}],"categories":[],"keywords":[{"id":"175623","name":"EAS Seminar"}],"core_research_areas":[],"news_room_topics":[],"event_categories":[{"id":"1795","name":"Seminar\/Lecture\/Colloquium"}],"invited_audience":[{"id":"78761","name":"Faculty\/Staff"},{"id":"177814","name":"Postdoc"},{"id":"174045","name":"Graduate students"},{"id":"78751","name":"Undergraduate students"}],"affiliations":[],"classification":[],"areas_of_expertise":[],"news_and_recent_appearances":[],"phone":[],"contact":[{"value":"\u003Cp\u003EAndrew Newman\u003C\/p\u003E\r\n","format":"limited_html"}],"email":[],"slides":[],"orientation":[],"userdata":""}}}