#TITLE_ALTERNATIVE#

• Main Author: PAJRIN JAMAN (NIM: 12304024), AGUS
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/19831
• Institution: Institut Teknologi Bandung

Earthquake that occurred on 26 December 2004 in Sumatra is the largest earthquake recorded during the 200 years. This earthquake cause a tsunami that ruptures a series of blocks almost 1300 km long segment of plate margin along the Andaman and Sumatra trench arc region. To know the sources of potential earthquake that will come in the future, the research of tectonic unit block, which is the subduction zone, are required. To be able to model the tectonic block model, the deep seismic refraction with excess seismic penetration depth to reach the top of the mantle are required. Model is done by making a curve matching between the refraction travel times of the waves that recorded on the Ocean Bottom Seismometer (OBS) with the travel time curve from the calculation model. In this research, we conduct to identify the tectonic block unit that has been pushed up as an accommodation of the compression force which is comes from the oceanic crust. And we found a thinning oceanic crust mantle layer that caused by a convection or fracture. In the last result, we found a delay time of the observation time due to the existence of low velocity zones. <br />