ESTIMASI KEDALAMAN SESAR SORONG MENGGUNAKAN METODE DOUBLE DIFFERENCE

Abstract

Papua is a region with a high level of seismicity caused by complex tectonic activity. There are several active faults in Papua and recorded a number of seismic history in the region, one of them is Sesar Sorong. To pass the analysis of Sorong Fault depth estimation, the accuracy of the hypocenter position is required. One method to relocate the hypocenter is the double difference method, hypocenter relocation by double difference method is expected to improve the accuracy of the hypocenter position. The principle of the double difference method is the residual time of the observed travel time and the calculation results between two adjacent earthquake events at the same recording station, provided that the distance between events must be closer than the event distance to the recording station. Data on the earthquake used as many as 2,374 events from the BMKG catalog recorded on 15 stations INA-Tews. Based on the results of the analysis of the Papua region faults, it was found that the North Sorong Fault (3-35 km), West Sorong Fault (10-38 km), and East Sorong Fault (3-40 km) were classified into shallow faults because of the depth of <60 km. The relocation result using doule difference method is quite effective because it shows the improvement of quality when viewed from residual distribution obtained after relocation compared to residual before relocation.