Abstract
Mount Merapi and Mount Merbabu are active volcanoes that lies in Java Island. Java island is part of Indonesia region. This island was subduction product of Eurasian and Indo-Australian plates, caused the island consist of many volcanoes. A regional gravity study was carried out over Mt. Merapi-Merbabu by TOPEX/Poseidon satellite data. The data was corrected by free air correction and become free air anomaly. Then, that anomaly was corrected by Bouguer and Terrain corrections, become Complete-Bouguer Anomaly. This study present subsurface density model beneath Mt. Merapi and Merbabu to identify the magma chamber.
Highlights
Java island lies within the Indonesian archipelago that was subduction product of Eurasian and Indo-Australian plates [1]
Gravity method carried out measuring and comparing gravity values at several stations, with various corrections applied to the data [5]
Gravity method can be divided into two measurements i.e., field measurement and satellite measurement
Summary
Java island lies within the Indonesian archipelago that was subduction product of Eurasian and Indo-Australian plates [1]. This research aims to identify subsurface structure of the Mount Merapi and Mount Merbabu’s magma chamber using gravity method. In addition to Earth Tides, latitude, free-air and Bouguer corrections, one must determine the local effect of the surrounding topography on the gravity field. We used gravity satellite data to identify geological structure, especially magma chamber location of Merapi and Merbabu volcanoes.
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