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Source mechanism of very-long-period signals accompanying dome growth activity at Merapi volcano, Indonesia

Geophysical Research Letters

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Abstract

Very-long-period (VLP) pulses with period of 6-7s, displaying similar waveforms, were identified in 1998 from broadband seismographs around the summit crater. These pulses accompanied most of multiphase (MP) earthquakes, a type of long-period event locally defined at Merapi Volcano. Source mechanisms for several VLP pulses were examined by applying moment tensor inversion to the waveform data. Solutions were consistent with a crack striking ???70?? and dipping ???50?? SW, 100m under the active dome, suggest pressurized gas transport involving accumulation and sudden release of 10-60 m3 of gas in the crack over a 6s interval.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Source mechanism of very-long-period signals accompanying dome growth activity at Merapi volcano, Indonesia
Series title:
Geophysical Research Letters
Volume
29
Issue:
23
Year Published:
2002
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
33
Last page:
1
Number of Pages:
-31