The seismicity of Popocatépetl is dominated by long-period and very-long period signals associated with hydrothermal processes and magmatic degassing. We model the source mechanism of repetitive long-period signals in the 0.4-2s band from a 15-station broadband network by stacking long-period events with similar waveforms to improve the signal-to-noise ratio. The data are well fitted by a point source located within the summit crater ∼250 m below the crater floor and ∼200 m from the inferred magma conduit. The inferred source includes a volumetric component that can be modeled as resonance of a horizontal steam-filled crack and a vertical single force component. The long-period events are thought to be related to the interaction between the magmatic system and a perched hydrothermal system. Repetitive injection of fluid into the horizontal fracture and subsequent sudden discharge when a critical pressure threshold is met provides a non-destructive source process. © 2012. American Geophysical Union. All Rights Reserved.
CITATION STYLE
Arciniega-Ceballos, A., Dawson, P., & Chouet, B. A. (2012). Long period seismic source characterization at Popocatépetl volcano, Mexico. Geophysical Research Letters, 39(20). https://doi.org/10.1029/2012GL053494
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