#TITLE_ALTERNATIVE#

• Main Author: AGOES NUGROHO (NIM : 12307053), INDRA
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/22571
• Institution: Institut Teknologi Bandung

This study purposes to use simultaneous inversion to determine hypocenter and 1-D seismic velocity model using microearthquake data. We created self-developed code for the simultaneous inversion in this study. Input data of this code are event location, arrival time phases, station location, initial velocity model and layer thickness. For the event location, we first determine initial event location using three circled method as input for simultaneous inversion. For the inversion procedure, synthetic travel times from source to receiver are calculated by shooting method. The matrix equation of simultaneous inversion is solved by iteratively damp least square. So, output of our self-developed code is 1-D seismic velocity model (Vp or Vs) and improved hypocenter location. This code has been validated with Mount Guntur earthquake data, and the result is the earthquake commonly occurred in depth 3-7 km. The other result is there is a velocity anomaly in depth 4-6 km in whichVpand Vs have low velocity, and Vp/Vs has higher value than the other depth. It is correlated with previous study which claim that in that area has some anomaly and can be interpreted as hot fluid and vapour.