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Analysis of EDM Data In Association With The 1992 Eruption at Merapi Volcano, Indonesia
The EDM measurement at the summit area of Merapi volcano had been done periodically in 1988, 1990, 1991, and 1992. By using the data of trilateration, horizontal strain components were calculated to evaluate strain pattern changes with time. During the period of 1988 - 1990, seismic and eruptive activities were rather low. In the period of 1990 - 1991, HFA and HFB type earthquakes increased and had kept high level prior to the February 2, 1992 eruption, which was followed by dome growth.
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