Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 31, Issue 21, Pages -Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1029/2004GL021179
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Characterizing the hydration state of the forearc mantle wedge yields valuable information on frictional stability at the downdip edge of subduction megathrusts. Simultaneous inversion of P- and S-wave arrival times collected as part of the Costa Rica Seismogenic Zone Experiment yields 1D and 3D P- and S-wave velocity models (V-P and V-S) for the Nicoya Peninsula segment of the Middle America Trench. Nicoya Peninsula 1D velocity models show similar velocity gradients to country-wide 1D velocity models from 5-30 km depth but diverge at expected Moho depths due to proximity to the subducting Cocos plate. 3D V-P values range from 7.2-7.6 km/sec in the forearc mantle wedge. Receiver functions computed at Global Seismic Network station JTS in northwestern Costa Rica confirm these V-P values, yield V-P/V-S of similar to1.85, and place the continental Moho at 36 +/- 4 km depth. V-P and V-P/V-S are consistent with 15-25% serpentinization of the forearc mantle wedge.
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