PPT-Subduction

Zone Observatory Big Geodynamics Related Science Questions Magali Billen Department of Earth amp Planetary Sciences UC Davis Collaborators amp Students Ana Negredo Moreno Juan RodriguezGonzalez PD Katrina Arredondo GS John . According . to Alfred Wegener, the super-continent of Pangea began to break up 200 million years ago with the continents attaining the size, shape, and location where we see them today. This movement of continents has not yet come to an end. According to J. Tuzo Wilson, the breakup and drifting of the present continents . 2 SUBDUCTION New oceanic crust is created at the East Pacific RiseOld oceanic crust and lithosphere are subducted at 3 Pacific Ocean Aleutian trenchKamchatka Notice that the trenches are curved with extraction. Zhao, Z., . P.D. . Bons. , . Eberhard . Karls University Tübingen, Germany. E. . . Gomez-Rivas, . University . as a random outcome of . time-dependent convection. Teresa Wong. Slava. . Solomatov. Theory of Earth II. AGU . Fall Meeting . 19 December . 2014. 1. Major questions on initiation of plate tectonics. (LVZ) at the top of the . subducting. plate has been detected in a majority of . subduction. zones.. LVZ may be a . hydrated layer of oceanic crust . caused by dehydration reactions as the plate . Formation and variability of North Atlantic sea surface salinity maximum in a global GCM. Tangdong. . Qu. International Pacific Research Center, SOEST, University of Hawaii. (. August. . 2. , 2010). Plate Boundaries. Why do we care about plate boundaries?. Plate Boundaries. Volcanoes and earthquakes most often occur where tectonic plates come together.. At plate boundaries, many other geologic features, such as mountains and rift valleys, can also occur.. (All shook up.). Earthquakes can be frightening events. .. (Click on left image for short video.). Earthquakes. Usually happen near . faults.. (What are faults?). Many faults are near plate boundaries, but they can be anywhere and everywhere.. Volcanism is mostly focused at plate margins. Pacific Ring of Fire. - Subduction - . Rift valleys . - Hotspots. Volcanoes are formed by:. . subduction. and collisions. Subduction. - When one crust sinks below another crust and melts, allowing magma to rise at the surface.. Zones. Lecture 44 . How were the continents created?. So far, we have talked about the when, but not the how.. Today, there are 3 main mechanisms by which new crust is created:. Rifting (e.g., African and Rio Grande Rifts) and divergent plate boundaries (North Atlantic Tertiary Province is an example).. . A. . Roesner, . M.J. . Ikari, . A. . Huepers. , . A.J. . Kopf. s. tudy. . site. Japan. PLEASE CLICK ON ME. EGU 2020 Session: . Understanding . large subduction earthquakes and . tsunamigenesis. 2. Morondova. plume. Bernhard . Steinberger. 1,2.  . and. . Douwe. van . Hinsbergen. 3. 1. GFZ . German Research . Centre. . for. . Geosciences. , . Geodynamic. . Modelling. Sec. 2.5, Potsdam, Germany (. subducting. plate has been detected in a majority of . subduction. zones.. LVZ may be a . hydrated layer of oceanic crust . caused by dehydration reactions as the plate . subducts. .. LVZ has interesting consequences for imaging the . An international multi-disciplinary observatory along a . subduction. zone plate boundary (. ies. ?). “. subduction. . collaboratory. ”. 2014 Fall AGU meeting, San Francisco. EarthScope. Beyond 2018.