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Seismic imaging of mantle melting processes beneath volcanic arcs and backarc spreading centers

Presented by: 
Douglas Wiens Washington University in St. Louis
Date: 
Monday 6th June 2016 - 11:30 to 12:30
Venue: 
INI Seminar Room 1
Abstract: 
Co-author:  S. Shawn Wei  (Washington University in St Louis; now at Scripps Institition of Oceanography)

Seismological studies using land and ocean bottom seismographs can help constrain models of mantle melting by imaging velocity anomalies resulting from the presence of partial melt.   Arc-backarc systems are particularly interesting, as they involve both flux and decompression melting mechanisms, variable water input into the melting process, and various levels of interaction between arc and backarc.   In addition, an extensive dataset of petrological and geochemical measurements also provide important constraints.   Seismic tomographic results imaging arc-backarc systems show extensive upper mantle regions with velocities that are too slow to be explained without invoking partial melt.   In the Mariana arc, mantle seismic anomalies beneath the arc and backarc spreading center are separated by a high velocity, low attenuation region at shallow depths (
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University of Cambridge Research Councils UK
    Clay Mathematics Institute London Mathematical Society NM Rothschild and Sons