Long period seismic source characterization at Popocatépetl volcano, Mexico
Geophysical Research Letters
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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.
Study Area
| 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 Hazards Program, Volcano Science Center |
| 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 |
| Google Analytic Metrics | Metrics page |