Long period seismic source characterization at Popocatépetl volcano, Mexico
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.
Citation Information
Publication Year | 2012 |
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Title | Long period seismic source characterization at Popocatépetl volcano, Mexico |
DOI | 10.1029/2012GL053494 |
Authors | Alejandra Arciniega-Ceballos, Phillip Dawson, Bernard A. Chouet |
Publication Type | Article |
Publication Subtype | Journal Article |
Series Title | Geophysical Research Letters |
Index ID | 70041414 |
Record Source | USGS Publications Warehouse |
USGS Organization | Volcano Hazards Program; Volcano Science Center |