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SEMINAR: MGG Student Seminar Wed. 3/28, 12-1 PM, Jan Norbisrath & Qiong Zhang

From: Pierpaolo Marchesini <pmarchesini@rsmas.miami.edu>
Subject: SEMINAR: MGG Student Seminar Wed. 3/28, 12-1 PM, Jan Norbisrath & Qiong Zhang
Date: Tue, 27 Mar 2012 03:55:46 +0000 
MGG STUDENT SEMINAR

WEDNESDAY, MARCH 28
12:00 - 1:00 PM
SLAB SEMINAR ROOM

Title: TBA
Jan Norbisrath

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Title: What can we know from earthquake relocation and tomography?
Qiong Zhang

Earthquake relocation and tomography are two essential techniques that use seismic waves generated by earthquake to obtain high-precision location of earthquake and image the interior of the Earth. Seismic waves velocities vary along the ray path between source and receiver due to variation of rock type and density. My study focus on body wave arrival time inversion, solving for better 1D and/or 3D velocity models in the crust and upper mantle and better earthquake relative locations.
The events from 1986 and to on the Puerto Rico Island (PRI), together with reference 1D model provided by Puerto Rico Seismicity Network have been inverted to generate the minimum 1D model. Using the minimum 1D model, our relocations show strong linear feature along the faults. The relationship between the local seismicity and the faults in the western PRI were poorly understood. According to our relocation, the frequent seismicity at western PRI correlates with serpentinite distribution.
The Coso geothermal field is a world-class geothermal resource in southern California. The interpretation of distribution of magma chamber is not uniform. And the crustal thinning is suggested by gravity and petrology study. We invert for 3D models of Vp and Vp/Vs structure of the crust and upper mantle to associate low velocity anomaly with geological features.


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