Slip Deficit Rates Estimation at Baribis Fault on 2016-2019 GPS Observations

Abstract

ABSTRACT
The surrounding area Baribis-Kendeng Fault is featured by active tectonic deformation. The slip deficit rate distribution is essential in explaining seismo-tectonics and assessing the risk of seismic hazards in this area because Java Island is the most populous island in the world. In this study, we collect GPS data from CORS stations and TPG stations then process the original carrier phase data of GPS to obtain the consistent velocity field in the ITRF2014. We assume two blocks separated by the Baribis fault: the Sunda block (footwall) and the Java block (hangingwall). The obtained velocity vector is used to estimate the Euler rotation parameter of each block. The estimated Euler poles parameters of the Java and Sunda blocks are estimated as their locations at 20.9° N, 120.2° E and 63.3° N, 112.2° W, respectively, and their angular velocities of 0.511°/ Myr counter-clockwise and 0.263°/ Myr counter-clockwise. These parameters produce Baribis fault slip rates with 3 mm/yr with strike fault in all segments. The slip deficit rates distribution is characterized by fully locking in the Subang 1 segment in the depth range from 10-20 km with the rate of 0.8 - 1 mm/yr.