Present-Day Surface Deformation along the Opak Fault, Yogyakarta, Observed Using Sentinel-1 Interferometric Wide-Swath Data

Abstract:

The Opak Fault (OF) system is the most widely known active fault system in Yogyakarta, Indonesia. This active fault system became increasingly recognized especially after the 2006 Yogyakarta earthquake. Although the 2006 Yogyakarta earthquake caused a lot of damage and casualties, seismogenic fault responsible for the event is still a matter of debate. GNSS-based observation studies suggested that the 2006 event occurred along the OF. However, seismic-based observation studies showed that this event might occurred several kilometers to the east of the OF. A better understanding of the active seismogenic fault is important to assess geohazards in the region. In this paper, Interferometric Synthetic Aperture Radar (InSAR) data from Sentinel-1 satellite, which has a wavelength of 5.6 cm and operates in Terrain Observation by Progressive Scan (TOPS) mode, was used to image deformation rates of the OF. The result showed that there is a significant surface deformation along the OF. This surface deformation could be driven by postseismic effect following the 2006 Yogyakarta earthquake or the aseismic creep. Displacement discontinuity, which indicates the location of the OF, could be recognized using InSAR technique. These finding confirm the capability of SAR observation in providing high spatial resolution of surface deformation data.

• Periodical: Advances in Science and Technology (Volume 112)
• Pages: 75-81
• DOI: https://doi.org/10.4028/p-e3jjj9
• Online since: April 2022
• Authors: Hidayat Panuntun*, Anindya Sricandra Prasidya, Gani Mahendra
• Keywords: InSAR, Opak Fault System, Postseismic Deformation, Sentinel-1, Yogyakarta

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