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Journal Article

The Central Andean Altiplano-Puna Magma Body

Authors

Chmielowski,  J.
External Organizations;
Publikationen aller GIPP-unterstützten Projekte, Deutsches GeoForschungsZentrum;

Zandt,  G.
External Organizations;
Publikationen aller GIPP-unterstützten Projekte, Deutsches GeoForschungsZentrum;

/persons/resource/haber

Haberland,  Christian
2.2 Geophysical Deep Sounding, 2.0 Physics of the Earth, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;
Publikationen aller GIPP-unterstützten Projekte, Deutsches GeoForschungsZentrum;

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Citation

Chmielowski, J., Zandt, G., Haberland, C. (1999): The Central Andean Altiplano-Puna Magma Body. - Geophysical Research Letters, 26, 6, 783-786.
https://doi.org/10.1029/1999GL900078


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_227881
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 conversions 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.