DETERMINATION OF GRAVITY ANOMALY MODELS IN EASTERN INDONESIAN SEA AREA USING ALTIMETRY SATELLITE

• Main Author: Wahyu Nugraha, Akbar
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/46996
• Institution: Institut Teknologi Bandung

Gravity anomaly in the ocean is a value that can be used for various purposes such as determination of marine geoid, prediction of seafloor depth, and plate tectonic studies. Thus, determining gravity anomalies in the Indonesian sea area will provide many benefits for a variety of purposes, especially for geoid purposes, which until now have not been adequately available. Determination of gravity anomaly in the ocean can be done in several ways, one of them is by using altimetry satellite. There are four altimetry satellites used in this study, namely Cryosat-2 phase A, Jason-1 phase C, SARAL phase B, and ERS-1 phase F. Sea Surface Height (SSH) data generated from altimetry satellites are used to calculate deflection of vertical in the north-south and west-east direction. By using the Inverse Vening Meinesz (IVM) method, vertical deflection in the two directions is then converted to gravity anomaly values. Altimetry satellites can be used to produce gravity anomaly models with spatial resolution up to 11.75 kilometers. Validation using shipborne data shows that the gravity anomaly from altimetry has an RMSE of 4,130 - 9,547 mGal.