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Three-dimensional P- and S-wave Velocity Structures of Mt. Guntur, West Java, Indonesia, from Seismic Tomography

A. Priyono, G. Suantika, S. Widiyantoro, B. Priadi, Surono


We employed a tomographic inversion technique to determine P- and S-wave velocity structures beneath the Mt. Guntur complex in West Java, where an active volcano is present. Our tomographic images clearly show low values of Vp and Vs located in the same position beneath the Mt. Guntur complex. The decrease in the P-wave velocity is faster than that in the S-wave. We found that the value of Vp/Vs in the anomalous zone is 6% - 12% lower relative to that of the surrounding medium beneath Mt. Guntur in the depth interval of 1 - 6 km from the surface topography. Most of micro-earthquakes are concentrated in and around the anomalous zone. The anomaly may be interpreted as a weak zone of volcanic materials due to remaining volcanic activities in the past that constitutes high temperature aqueous fluid in pores (H2O-filled pores) with high aspect ratio rather than melting rock. The presence of aqueous fluid in and around the anomalous zone may have caused seismic activities in the study area.


Mt. Guntur, P- and S-wave velocity structures, Vp/Vs, tomography.

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