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Observations of rapid-fire event tremor at Lascar volcano, Chile

Annals of Geophysics

By:
, , , ,
DOI: 10.4401/ag-3972

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Abstract

During the Proyecto de Investigacio??n Sismolo??gica de la Cordillera Occidental (PISCO '94) in the Atacama desert of Northern Chile, a continuously recording broadband seismic station was installed to the NW of the currently active volcano, Lascar. For the month of April, 1994, an additional network of three, short period, three-component stations was deployed around the volcano to help discriminate its seismic signals from other local seismicity. During the deployment, the volcanic activity at Lascar appeared to be limited mainly to the emission of steam and SO2. Tremor from Lascar is a random, ??rapid-fire?? series of events with a wide range of amplitudes and a quasi-fractal structure. The tremor is generated by an ensemble of independent elementary sources clustered in the volcanic edifice. In the short-term, the excitation of the sources fluctuates strongly, while the long-term power spectrum is very stationary.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Observations of rapid-fire event tremor at Lascar volcano, Chile
Series title:
Annals of Geophysics
DOI:
10.4401/ag-3972
Volume
39
Issue:
2
Year Published:
1996
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
273
Last page:
282
Number of Pages:
10