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GEOPHYSICAL RESEARCH LETTERS,
VOL. 33,
L09303,
4 PP., 2006
doi:10.1029/2006GL025928
Increase of shear wave velocity before the 1998 eruption of Merapi volcano (Indonesia)
Department of Geophysics and Geology, University of Leipzig, Leipzig, Germany
GeoForschungsZentrum Potsdam, Potsdam, Germany
Department of Geophysics, Colorado School of Mines, Golden, Colorado, USA
Center for Volcano Research and Technology Development, Volcanological Survey of Indonesia, Yogyakarta, Indonesia
We infer temporal changes in the elastic properties of the edifice of Merapi volcano (Java, Indonesia) before its eruption in 1998 by analyzing multiply scattered elastic waves excited by a repeatable controlled seismic source. A pre-eruptive increase of shear wave velocity, which correlates well with pre-eruptive seismicity and dome-growth is revealed. The method can be used as a “pressure-gauge” for pressure changes inside of volcanoes, because increasing pressures in rocks are known to cause proportionally increasing elastic wave velocities.
Received 1 February 2006; accepted 14 March 2006; published 10 May 2006.
Citation: (2006), Increase of shear wave velocity before the 1998 eruption of Merapi volcano (Indonesia), Geophys. Res. Lett., 33, L09303, doi:10.1029/2006GL025928.
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