Seismic tomography at Popocatépetl volcano, Mexico

Pia Berger; Jean-Luc Got; Carlos Valdes Gonzalez; Vadim Monteiller

doi:10.1016/j.jvolgeores.2010.12.016

Journal articles

Seismic tomography at Popocatépetl volcano, Mexico

Pia Berger ¹ Jean-Luc Got ² Carlos Valdes Gonzalez ³ Vadim Monteiller ⁴

1 Instituto de Geofisica [Mexico]

2 Géophysique des volcans & géothermie

ISTerre - Institut des Sciences de la Terre

3 DTP - Dynamique terrestre et planétaire

4 ISTerre - Institut des Sciences de la Terre

Abstract : We performed the first 3D seismic tomography of the Popocatépetl volcano, Mexico, from the inversion of the P-wave arrival times of nearly 1500 earthquakes recorded by up to 11 seismic stations of the permanent CENAPRED-SSN network. We used the Bayesian tomographic algorithm developed by Monteiller et al. (2005) to perform this P-wave travel-time tomography and carefully choose optimal regularization hyper-parameters. Sensitivity tests show that the inversion is correctly constrained under the volcano from − 1 to 4 km depth b.s.l.. At these depths, the optimal tomographic model mainly shows low-velocity volumes surrounded by higher-velocity volumes. Lateral heterogeneity is strong: the variation of the P-wave velocity may reach up to ± 20% of the average value at a given depth. Low-velocity volumes correlate well with results from former geological and geophysical studies.

Keywords : Popocatépetl seismic tomography volcano-tectonic events

Document type :

Journal articles

Domain :

Sciences of the Universe [physics] / Earth Sciences / Geomorphology

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https://hal-insu.archives-ouvertes.fr/insu-00679305
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Submitted on : Thursday, March 15, 2012 - 1:50:02 PM
Last modification on : Monday, July 19, 2021 - 11:22:02 AM

Seismic tomography at Popocatépetl volcano, Mexico

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Seismic tomography at Popocatépetl volcano, Mexico

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