Coincident anomalies of seismic attenuation and electrical resistivity beneath the southern Bolivian Altiplano plateau

Details Coincident anomalies of seismic attenuation and electrical resistivity beneath the southern Bolivian Altiplano plateau Coincident anomalies of seismic attenuation and electrical resistivity beneath the southern Bolivian Altiplano plateau

Sep 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30rsde1h&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 18, pp. SDE 1-1, CiteID 1923, DOI 10.1029/2003GL017492

Physics

14

Physical Properties Of Rocks: Magnetic And Electrical Properties, Physical Properties Of Rocks: Wave Attenuation, Seismology: Lithosphere And Upper Mantle, Tectonophysics: Earth'S Interior-Composition And State (1212), Information Related To Geographic Region: South America

Scientific paper

Reassessment of local earthquake data from the ANCORP seismological network allowed the calculation of 3D attenuation (Qp) tomographic images of crust and upper mantle beneath the southern Bolivian Altiplano around 21° S. The images reveal a low-Qp middle and lower crust and a moderate-Qp upper mantle beneath the southern Altiplano. Beneath the recent magmatic arc, Qp is not significantly decreased at this latitude. The distribution of crustal Qp coincides with the variation of electrical resistivity, thus limiting the possible mechanisms causing the anomalies. Our findings support the hypothesis that partial melts in middle and lower crust beneath the Altiplano are present on a large scale. We see no evidence for a shallow asthenosphere beneath the southern Altiplano.

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