ANALISIS DEFORMASI SESAR SUMATERA SEGMEN SUMANI DAN SIANOK BERDASARKAN DATA PENGAMATAN GPS TAHUN 2008-2016

• Main Author: Rahman, Arief
• Format: Final Project
• Language: Indonesia
• Subjects: Teknik (Rekayasa, enjinering dan kegiatan berkaitan)
• Online Access: https://digilib.itb.ac.id/gdl/view/32119
• Institution: Institut Teknologi Bandung

Sumatra island is a part of Eurasian plate that has convergence interraction with Indo-Australian plate. Oblique subduction between those plates forming a subduction zone in the western part of the Sumatra island and fault segments onshore Sumatra island. Those subduction zones and fault segments often cause earthquakes in that region. Sumani and Sianok segments are two segments of the Sumatran fault are located in west Sumatra were actively moving time by time. On March 6, 2007 M6.4 and M6.3 earthquakes occurred in both segments, it proves that Sumani and Sianok segments still moving up until now. The movement of Sumatran fault can be identified using GPS observation data. GPS observation data that be used in this research are data from 2008 to 2016 observed by Indonesia Geospatial Information Agency (BIG) and the Sumatran GPS Array (SuGAr) network. GPS data are processed using scientific software GAMIT/GLOBK 10.5. The results of the processing from GPS observation data will be processed to produce vector of velocity and strain of each GPS station so that it can be used to observe the deformation activity that occurred in the Sumani and Sianok segments. The results of GPS observation data processing show that the strain value between each GPS observation station around 0.05 microstrain to 0.3 microstrain. When combined it with the strain pattern and the velocity vector of each GPS observation station can be known that the Sumatran fault in the Sumani and Sianok segments are right lateral strike-slip fault (dextral) with the velocity of 1.37 ± 0.232 cm/year in the Sianok segment and 2.04 ± 0.008 cm/year in the Sumani segment.