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SUMMARY:Slab geometry and mantle flow in the Rivera-Cocos subduction zone 
 - Professor James Ni\, New Mexico State University
DTSTART:20100310T163000Z
DTEND:20100310T173000Z
UID:TALK22672@talks.cam.ac.uk
CONTACT:Ed Nissen
DESCRIPTION:Seismic tomographic images from the MARS experiment (Mapping R
 ivera Subduction zone) show that below a depth of 160 km there exists a ga
 p between the Rivera and Cocos slabs that increases in width with depth. T
 eleseismic SKS and local S wave splitting parameters indicate that the mai
 n source of anisotropy resides in the entrained mantle below the young and
  thin Rivera plate.  The curved pattern of fast SKS split directions in th
 e western Jalisco block and the Rivera-Cocos slab gap indicates 3-D toroid
 al mantle flow around the northwestern edge of the Rivera slab and the Riv
 era-Cocos gap.  Both the tomographic images and shear wave splitting resul
 ts support the idea that the Rivera and western Cocos plates not only move
 d in a down-dip direction but also have recently rolled back toward the tr
 ench and that the Colima rift is intimately related to the tearing between
  the Rivera and Cocos plates.
LOCATION:Marine/Wolfson Building lecture hall
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