Long period seismic source characterization at Popocatépetl volcano, Mexico

Geophysical Research Letters
By: , and 



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

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