Magnetic signatures associated with magma ascent and stagnation at Popocatepetl volcano, Mexico, during 2006
Ana Lillian Martin-Del Pozzo, Gerardo Cifuentes, Eduardo González, Alicia Martinez, Fabiola Mendiola, 2008. "Magnetic signatures associated with magma ascent and stagnation at Popocatepetl volcano, Mexico, during 2006", Dynamics of Crustal Magma Transfer, Storage and Differentiation, Catherine Annen, Georg F. Zellmer
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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.