SHEAR WAVE VELOCITY CONSTRUCTION USING LOVE WAVE AMBIENT NOISE TOMOGRAPHY IN WEST JAVA REGION

• Main Author: Luthfiyani, Nurida
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/68745
• Institution: Institut Teknologi Bandung

West Java is located in the northern part of the subduction zone between the Australian and Eurasian plates which has a complex tectonic setting and high seismicity level. In 2016, Institut Teknologi Bandung (ITB) and Australia National University (ANU) were deployed temporary seismometers in three recording phases with 90 seismometer station in total to investigate this area. We constructed the shallow crust profile by applying the Love wave Ambient Noise Tomography (ANT) method to improve our knowledge of the tectonic condition in West Java. In this research, we used the north-south (NS) and east-west (EW) components to extract the Empirical Green’s function. We first rotated the NS and EW daily data series to obtain the transverse component. We then pre-processed the transverse daily data and applied crosscorrelation to all station pair data. The daily cross-correlated data is then stacked to obtain the Empirical Green’s function with high signal-to-noise ratio (SNR). The obtained Green’s function will be analyzed with frequency-time analysis (FTAN) to get the Love waves group velocity which has good resolution from 3-15 s. This Love wave group velocity then will be inverted to obtain the shear wave velocity (Vs) profile up to 12 km depth. Several geological features that can be intepreted from this study are the Bandung Basin and Garut Basin which has shear velocity 2200- 2500 m/s and Bogor Zone with shear wave veolocity more than 3200 m/s..