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

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Source mechanism of very-long-period signals accompanying dome growth activity at Merapi volcano, Indonesia; 2002; Article; Journal; Geophysical Research Letters; Hidayat, D.; Chouet, B.; Voight, B.; Dawson, P.; Ratdomopurbo, A.

Summary

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.

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Type Scheme Key
local-index unknown 70023916
local-pk unknown 70023916
series unknown Geophysical Research Letters

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journalGeophysical Research Letters
parts
typevolume
value29
typeissue
value23
languageEnglish
citationTypeArticle

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