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

  • Reassessment of local earthquake data from the ANCORP seismological network allowed the calculation of 3D attenuation (Q(p)) tomographic images of crust and upper mantle beneath the southern Bolivian Altiplano around 21degrees S. The images reveal a low-Q(p) middle and lower crust and a moderate-Q(p) upper mantle beneath the southern Altiplano. Beneath the recent magmatic arc, Q(p) is not significantly decreased at this latitude. The distribution of crustal Q(p) 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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Author:Christian Haberland, Andreas Rietbrock, B. Schurr, Heinrich Brasse
Document Type:Article
Year of first Publication:2003
Year of Completion:2003
Release Date:2017/03/24
Source:Geophysical Research Letters. - ISSN 0094-8276. - 30 (2003), 18, S. 4
Organizational units:Mathematisch-Naturwissenschaftliche Fakultät / Institut für Geowissenschaften
Peer Review:Referiert