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The Great Sumatran Fault (GSF) is a 1900-km-long fault extending from Lampung, Indonesia to the Andaman Islands, India. The fault location is not only on the land but also in the sea area. Previous researches were only focused on the land area of the Sumatra and Andaman Island even though the marine fault has also impacted earthquakes and tsunamis such as the Indian Ocean tsunami in 2004. As an effort to disaster risk mitigation, this study used gravity method in order to map and to study the continuity of the Sumatran fault in the marine area from the Aceh Province, Indonesia to the Andaman Islands, India. The gravity data came from Topex (NASA) and Poseidon (CNES) altimeter acquired in 2011 with a resolution of 1.85 km/px. Based on Bouguer gravity data, the subduction zone in the western part of the Indian Ocean is observed with the anomaly of 500â€“700 mGal, while the residual structure of GSF, relative to the subduction zone, only comes to clarity through a horizontal derivative transformation with anomaly 130-250 mGal. To delineate the geometry of the fault, the 3D gravity data need to be inverted with the forward modeling approach and integrated with the geological setting as a constrains model.

CONTINUITY OF GREAT SUMATRAN FAULT IN THE MARINE AREA REVEALED BY 3D INVERSION OF GRAVITY DATA