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Earthquake location determination using data from DOMERAPI and BMKG seismic networks: A preliminary result of DOMERAPI project

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AIP Conference Proceedings 2015年第1期1658卷

作者： Mohamad Ramdhan Andri Dian Nugraha Sri Widiyantoro Jean-Philippe Métaxian Ayunda Aulia Valencia 1Study Program of Earth Science Institut Teknologi Bandung Jl. Ganesa 10 Bandung 40132 Indonesia 2Agency for Meteorology Climatology and Geophysics of Indonesia (BMKG) Jl. Angkasa 1 No. 2 Kemayoran Jakarta Pusat 10720 Indonesia 3Global Geophysics Research Group Faculty of Mining and Petroleum Engineering Institut TeknologiBandung Jl. Ganesa 10 Bandung 40132 Indonesia 4Institut de Recherche pour le Développement (IRD) France 5Study Program of Geophysical Engineering Institut Teknologi Bandung Jl. Ganesa 10 Bandung 40132 Indonesia (Email: mohamad.ramdhan@bmkg.go.id)

DOMERAPI project has been conducted to comprehensively study the internal structure of Merapi volcano, especially about deep structural features beneath the volcano. DOMERAPI earthquake monitoring network consists of 46 broad-band seismometers installed around the Merapi volcano. Earthquake hypocenter determination is a very important step for further studies, such as hypocenter relocation and seismic tomographic imaging. Ray paths from earthquake events occurring outside the Merapi region can be utilized to delineate the deep magma structure. Earthquakes occurring outside the DOMERAPI seismic network will produce an azimuthal gap greater than 1800. Owing to this situation the stations from BMKG seismic network can be used jointly to minimize the azimuthal gap. We identified earthquake events manually and carefully, and then picked arrival times of P and S waves. The data from the DOMERAPI seismic network were combined with the BMKG data catalogue to determine earthquake events outside the Merapi region. For future work, we will also use the BPPTKG (Center for Research and Development of Geological Disaster Technology) data catalogue in order to study shallow structures beneath the Merapi volcano. The application of all data catalogues will provide good information as input for further advanced studies and volcano hazards mitigation.

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