Crustal images from San Juan, Argentina, obtained using high frequency local event receiver functions

Josh A. Calkins, George Zandt, Hersh J. Gilbert, Susan L. Beck

Research output: Contribution to journalArticle

21 Scopus citations

Abstract

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.

Original languageEnglish (US)
Article numberL07309
JournalGeophysical Research Letters
Volume33
Issue number7
DOIs
StatePublished - Apr 16 2006

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

Fingerprint Dive into the research topics of 'Crustal images from San Juan, Argentina, obtained using high frequency local event receiver functions'. Together they form a unique fingerprint.

  • Cite this