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.
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Magmas are subject to a series of processes that lead to their differentiation during transfer through, and storage within, the Earth’s crust. The depths and mechanisms of differentiation, the crustal contribution to magma generation through wall-rock assimilation, the rates and timescales of magma generation, transfer and storage, and how these link to the thermal state of the crust are subject to vivid debate and controversy. This volume presents a collection of research articles that provide a balanced overview of the diverse approaches available to elucidate these topics, and includes both theoretical models and case studies. By integrating petrological, geochemical and geophysical approaches, it offers new insights to the subject of magmatic processes operating within the Earth’s crust, and reveals important links between subsurface processes and volcanism.