Long period seismic source characterization at Popocatépetl volcano, Mexico

Arciniega-Ceballos, Alejandra; Dawson, Phillip; Chouet, Bernard A.

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.

Genre:

Article

ProdID:

70041414

Citation Author:

Arciniega-Ceballos, Alejandra ; Dawson, Phillip ; Chouet, Bernard A.

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Volcano Science Center

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English

Citation Larger Work Title:

Geophysical Research Letters

Citation LatN:

19.031458

Citation LatS:

19.011456

Citation LonE:

-98.617632

Citation LonW:

-98.63764

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Citation Phsyical Description:

5 p.; L20307

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American Geophysical Union

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Citation Search Results Text:

Long period seismic source characterization at Popocatépetl volcano, Mexico; 2012; Article; Journal; Geophysical Research Letters; Arciniega-Ceballos, Alejandra ; Dawson, Phillip ; Chouet, Bernard A.