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Magnetic signatures associated with magma ascent and stagnation at Popocatepetl volcano, Mexico, during 2006

By
Ana Lillian Martin-Del Pozzo
Ana Lillian Martin-Del Pozzo
Instituto de Geofisica, Universidad Nacional Autónoma de México, Circuito Institutos, México D.F., 04510, Mexico (e-mail: analil@geofisica.unam.mx)
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Gerardo Cifuentes
Gerardo Cifuentes
Instituto de Geofisica, Universidad Nacional Autónoma de México, Circuito Institutos, México D.F., 04510, Mexico (e-mail: analil@geofisica.unam.mx)
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Eduardo González
Eduardo González
Instituto de Geofisica, Universidad Nacional Autónoma de México, Circuito Institutos, México D.F., 04510, Mexico (e-mail: analil@geofisica.unam.mx)
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Alicia Martinez
Alicia Martinez
Centro Nacional de Prevención de Desastres, Delfín Madrigal 665, México D.F. 04360, México
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Fabiola Mendiola
Fabiola Mendiola
Instituto de Geofisica, Universidad Nacional Autónoma de México, Circuito Institutos, México D.F., 04510, Mexico (e-mail: analil@geofisica.unam.mx)
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Published:
January 01, 2008

Abstract

Monitoring of real-time magnetic signals at Popocatepetl during 2006 has allowed discrimination of magma injection and dome growth. Magnetic signals correlated with seismic, volcanotectonic events and harmonic tremor, as well as number of small emissions, spring water pH, ash components and dome evolution helped define upward magma transport and yield a better understanding of the volcanic plumbing system. Magma ascent occurs mostly in periods of 7±3 days associated with harmonic tremor and decreasing magnetic signals between −1.1 and −15 nT, followed by increasing signals linked to cooling of the domes and increased seismicity over periods of 1 to more than 3 months. The dome clogs the vent after the negative magnetic anomaly–harmonic tremor period associated with magma ascent and forces an explosive crater-reopening explosion. Larger negative changes in the magnetic signals occurred in April (−6 nT), August (−3 to −6 nT) and October to December (−5 to −15 nT), associated with dome formation and growth. Negative magnetic anomalies preceded eruptions by 3 days in 2006.

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Contents

Geological Society, London, Special Publications

Dynamics of Crustal Magma Transfer, Storage and Differentiation

Catherine Annen
Catherine Annen
University of Geneva, Switzerland
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Georg F. Zellmer
Georg F. Zellmer
Academia Sinica, Taipei, Taiwan
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Geological Society of London
Volume
304
ISBN electronic:
9781862395527
Publication date:
January 01, 2008

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