Physics
Scientific paper
Apr 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3307309c&link_type=abstract
Geophysical Research Letters, Volume 33, Issue 7, CiteID L07309
Physics
3
Seismology: Body Waves, Seismology: Lithosphere (1236), Seismology: Oceanic Crust, Seismology: Subduction Zones (1207, 1219, 1240)
Scientific paper
Images of the crust and upper mantle obtained using teleseismic receiver functions exhibit a weak P-S conversion from the Moho in Western Argentina, where a segment of the subducting Nazca plate flattens out beneath the overriding South American plate. To better estimate depth to the Moho and search for mid-crustal impedance contrasts, we calculate high frequency receiver functions using 37 intermediate-depth local earthquakes. Radial receiver functions from a station located near San Juan, Argentina, show a strong signal from the Moho at 7 seconds corresponding to a depth near 50 km, and conversions from interfaces within the crust at depths of ~20 and 35 km. The higher frequency results obtained using local events have twice the vertical resolution of the teleseismic results and the combined data sets indicate a gradational increase in S velocity in the lower crust that cannot be detected in the lower frequency teleseismic data alone.
Beck Susan L.
Calkins Josh A.
Gilbert Hersh J.
Zandt George
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