Abstract

Satellite derived gravity data are widely used for regional scale studies of deep crustal structures over oceans. In the present work, free-air satellite gravity data are used to delineate the crustal structure of Andaman subduction zone. The study area covers an active plate boundary where the Indian plate subducts below south-east Asian plate. The tectonic setting of the area is complex and poorly understood. The gravity data along an east-west profile, running across the major tectonic features of the area, is analyzed using a robust optimization technique. A new concept of model-parameterization by using arc-tangent basis function is introduced. A priori geological information is used to constrain the model.