CRUSTAL STRUCTURE OF BORNEO, MAKASSAR STAIT, AND SULAWESI FROM AMBIENT NOISE TOMOGRAPHY AND RECEIVER FUNCTION

• Main Author: Heryandoko, Nova
• Format: Dissertations
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/86671
• Institution: Institut Teknologi Bandung

Borneo and Sulawesi are two large islands separated by the Makassar Strait in a complex tectonic setting. Understanding the seismic structure in this region is still an interesting object of research due to limited data availability. In this study, 3-D Vs and radial anisotropy models have been generated from the dispersion analysis of Rayleigh and Love waves extracted from seismic noise recordings. Furthermore, in this study, Moho depth and Vp/Vs ratio were also studied, which were inversed from teleseismic earthquake event records using the receiver function method. The model suggests that there is a wide and deep sedimentary basement at ~14 km depth beneath the North Makassar Strait underlain by a shallow Moho layer at ~22 km depth and a deep Moho layer (>40 km) beneath Central Sulawesi. The negative anisotropy beneath the North Makassar Strait to Sulawesi is likely caused by rifting of the Makassar rifting and this feature may play a role in the uplift of western Central Sulawesi.