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

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Journal Article

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[1] 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 similar to70degrees and dipping similar to50degrees SW, 100m under the active dome, suggest pressurized gas transport involving accumulation and sudden release of 10-60 m(3) of gas in the crack over a 6s interval.

Publication Details


Geophysical Research Letters



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