Geodetic and Geomorphic Evaluations of Earthquake Generation Potential of the Northern Sumatran Fault, Indonesia
We have conducted geodetic and geomorphic observations in the northernmost part of Sumatra, Indonesia to monitor strain accumulation in the vicinity of the northern Sumatran fault. Evaluation of the earthquake generation potential in this region is highly urgent because of a large fault slip rate, absence of major earthquakes for more than 100 years and recent Coulomb stress increase on the fault due to the 2004 Sumatra-Andaman earthquake (M w 9. 2). We have deployed Aceh GPS Network for the Sumatran Fault System (AGNeSS) since 2005. The data collected have been used for estimating slip/locking distribution of the Sumatran fault and constructing a comprehensive model for postseismic deformation after the 2004 event. Tectonic geomorphic features are also important to reveal long-term slip history of the fault. We have used high-resolution stereo-paired ALOS (Advanced Land Observing Satellite) PRISM (Panchromatic Remote-sensing Instrument for Stereo Mapping) satellite images to map the surface trace of the Sumatran fault and conducted field observations to ensure the trace by geomorphic and geologic evidence. We introduce preliminary results of the fault mapping together with a brief description of the crustal deformation field detected by GPS.
KeywordsALOS PRISM Earthquake generation potential GPS Geomorphic observation Sumatran fault
Our fieldwork was supported by many staff and students of Syiah Kuala University and Bandung Institute of Technology. We thank all collaborators and Indonesian authorities. Comments by N. T. Ramos, P. Willis (the editor) and two anonymous reviewers helped improve the manuscript. This work was supported by the Grant-in-Aid for Scientific Research (B) No.24403005 from Japan Society for the Promotion of Science.
- Cattin R, Chamot-Rooke N, Pubellier M, Rabaute A, Delescluse M, Vigny C, Fleitout L, Dubernet P (2009) Stress change and effective friction coefficient along the Sumatra-Andaman-Sagaing fault system after the 26 December 2004 (M w = 9. 2) and the 28 March (M w = 8. 7) earthquakes. Geochem Geophys Geosyst 10. doi:10.1029/2008GC002167
- Gunawan E, Sagiya T, Ito T, Kimata F, Tabei T, Ohta Y, Meilano I, Abidin HZ, Agustan, Nurdin I, Sugiyanto D (2014) A comprehensive model of postseismic deformation of the 2004 Sumatra-Andaman earthquake deduced from GPS observations in northern Sumatra. J Asian Earth Sci 88:218–229CrossRefGoogle Scholar
- Ito T, Gunawan E, Kimata F, Tabei T, Simons M, Meilano I, Agustam, Ohta Y, Nurdin I, Sugiyanto D (2012) Isolating along-strike variations in the depth extent of shallow creep and fault locking on the northern Great Sumatran Fault. J Geophys Res 117:B06409. doi:10.1029/2011JB008940 CrossRefGoogle Scholar
- JAXA (Japan Aerospace Exploration Agency) (2007) NDX-070015 ALOS user handbook. http://www.eorc.jaxa.jp/ALOS/en/doc/alos_userhb_en.pdf
- Purbawinata MA, Mulyadl E, Wahyudin D, Bacharudin R, Hadisantono RD (2001) Distribution map of active volcanoes in Indonesia, Directorate of Volcanology and Geologic Hazard Mitigation, Ministry of Energy and Mineral ResourcesGoogle Scholar
- Tabei T, Ito T, Kimata F, Ohta Y, Gunawan E, Ismail N, Sugiyanto D, Nurdin I (2013) Crustal deformation detected by GPS observation network across the Sumatran fault system in northwestern Sumatra, Indonesia. American Geophysical Union 2013 Fall Meeting, 9–13 December, San Francisco, USAGoogle Scholar