The central Andean Altiplano-Puna magma body

Details The central Andean Altiplano-Puna magma body The central Andean Altiplano-Puna magma body

Mar 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26..783c&link_type=abstract

Geophysical Research Letters, Volume 26, Issue 6, p. 783-786

Physics

36

Seismology: Continental Crust, Tectonophysics: Continental Contractional Orogenic Belts, Volcanology: General Or Miscellaneous

Scientific paper

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<0.5km/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 still-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.

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