ANALYSIS OF DEFORMATION PATTERN IN SOUTHERN JAVA POST 2006 PANGANDARAN EARTHQUAKE BASED ON 2010-2020 GPS DATA

• Main Author: Nafishanaya, Fadhila
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/82757
• Institution: Institut Teknologi Bandung

Indonesia is located at the confluence of several large plates that are actively moving so that it is prone to earthquakes where most of the area has high seismicity. One of the destructive earthquake events was the 2006 Pangandaran earthquake with a magnitude of M7.7 which occurred on the southern coast of Java. This research analyzes the deformation patterns that occurred after the Pangandaran earthquake. The data used in this research comes from three GPS (Global Positioning System) observation stations recorded by BIG (Geospatial Information Agency) and located in southern Java. The data processing includes data preparation, data pre-processing, and continued with main data processing. The results of data processing obtained are displacement vectors for a certain period. This study analyzes the displacement model of the viscoelastic relaxation mechanism in southern Java as a result of the 2006 Pangandaran earthquake for 9 time periods from 2010–2020 data. Furthermore, this study compares the magnitude of deformation that occurs due to the relaxation process after the 2006 earthquake with the combined post-earthquake afterslip effect and the locking effect in the subduction zone (megathrust coupling). The results of this study prove that the deformation pattern in the southern region of Java is dominated by the combined impact of afterslip and megathrust coupling from the Java Trench subduction zone.