Early Results of Teleseismic Tomography around Timor Island

The Timor region yields to an area for geologists that sits in a transitionalzone which is the boundary between subduction and collision zones. In this study, the goal is to better understand the tectonic conditions by imaging the subsurfacestructures in the region, especially in the upper mantle area. The study uses teleseismic tomography, a method that is particularly good at capturing deep structural features, making it ideal for tectonic research. The tomographic imaging was carried out using the FMTOMO code, which uses the fast-marching method for ray tracing and subspace inversion for the actual imaging process. To check the accuracy of the model, a checkerboard resolution test was performed, showing that reliable interpretation begins at a depth of 100 km. Horizontal cross-sections in the depth of 100 km, 200 km, and 300 km and Vertical cross-sections at longitude of 122°E and 124°E reveal a high-velocity area that represents the subducting Indo-Australian Plate, providing insight into the subduction structure in the region.