Long period seismic source characterization at Popocatépetl volcano, Mexico

Geophysical Research Letters
By: , and 

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Abstract

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 0.4–2 s 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.

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Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Long period seismic source characterization at Popocatépetl volcano, Mexico
Series title Geophysical Research Letters
DOI 10.1029/2012GL053494
Volume 39
Year Published 2012
Language English
Publisher American Geophysical Union
Publisher location Washington, D.C.
Contributing office(s) Volcano Science Center, Volcano Hazards Program
Description 5 p.; L20307
Larger Work Type Article
Larger Work Subtype Journal Article
Larger Work Title Geophysical Research Letters
Country Mexico
Other Geospatial Popocat�petl Volcano