Love Wave Group Velocity Extraction Using Ambient Noise Tomography in West Java, Indonesia

Abstract

West Java, Indonesia, is located in the northern part of the subduction zone between the Australian and Eurasian plates, with a complex tectonic setting and high seismicity level. In 2016, Institut Teknologi Bandung (ITB) and Australia National University (ANU) deployed 85 temporary seismometers to investigate this area. We constructed the shallow crust profile by applying the 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 Love waves 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 cross-correlation to all station pair data. The daily cross-correlated data is stacked to obtain the Love waves Green’s function. The Green’s function in this study is clearly seen in the 1-25 s period band. The obtained Green’s function will be analyzed further to get the Love waves group velocity which then will be inverted to obtain the shear wave velocity (Vs) profile beneath the study area.