Long period seismic source characterization at Popocatépetl volcano, Mexico
Article first published online: 20 OCT 2012
©2012. American Geophysical Union. All Rights Reserved.
Geophysical Research Letters
Volume 39, Issue 20, 28 October 2012
How to Cite
2012), Long period seismic source characterization at Popocatépetl volcano, Mexico, Geophys. Res. Lett., 39, L20307, doi:10.1029/2012GL053494., , and (
- Issue published online: 20 OCT 2012
- Article first published online: 20 OCT 2012
- Manuscript Accepted: 19 SEP 2012
- Manuscript Revised: 15 SEP 2012
- Manuscript Received: 8 AUG 2012
- long-period signals;
- source mechanism
 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.