The central Andean Altiplano-Puna magma body

Josef Chmielowski, George Zandt, Christian Haberland

Research output: Contribution to journalArticle

154 Scopus citations

Abstract

Receiver function analysis of 14 teleseismic events recorded by 6 temporary PASSCAL broadband stations within the Altiplano-Puna volcanic complex (APVC) shows a consistent ∼2 s negative-polarity P-to-S conversion for all stations for all available azimuths. Forward modeling of the largest amplitudes suggests that this conversion is produced by the top of a very low velocity zone at a depth of ∼19 km, with a Vs < 0.5 km/s and a thickness of 750-810 m. We interpret the characteristics of the low-velocity zone (low Vs, areal extent, and flatness) to be consistent with a sill-like magma body. On the basis of additional data from the German ANCORP experiment, the Altiplano-Puna magma body appears to underlie much of the APVC, and it may therefore be the largest known active continental crustal magma body.

Original languageEnglish (US)
Pages (from-to)783-786
Number of pages4
JournalGeophysical Research Letters
Volume26
Issue number6
DOIs
StatePublished - Mar 15 1999

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

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