Ambient Seismic Noise Cross – Correlation of the Tangkuban Parahu Volcano, West Java Indonesia: Preliminary Result

Abstract

Tangkuban Parahu is an active volcano in Indonesia that is part of the Quaternary Sunda volcanic arc. We used the vertical component of waveform recorded by 55 temporary seismic stations deployed around Tangkuban Parahu volcano from October 2021 to February 2022 to gain a thorough understanding of its seismic structure. To extract empirical Green’s functions, we computed cross-correlations of the vertical component of continuous record data. The empirical Green’s function was extracted from the daily data series, and the cross-correlation data from each day was stacked into a single inter-station cross-correlation data set. The empirical Green’s Function is seen at the band period 1-10 s. In this preliminary result, we obtained the Rayleigh wave group velocity map in period 1 s. The result shows a low-velocity value around the crater surrounded by high velocities. The low velocity is related to the weak zone or fluid presence.