Relokasi Gempa Mikro Menggunakan Metode Double Difference Untuk Memodelkan Reservoir Lapangan Panasbumi Kamojang

This research was conducted at a geothermal field Kamojang to relocate the position of micro earthquakes hypocenter to make a model of reservoir based on geometry. Relocate hypocenter in geothermal field Kamojang has done to improve the accuracy of hypocenter position. One of the techniques to determine the more accurate hypocenter position is double difference algorithm. Double difference method based on the fact that if the difference of distances between two hypocenter are very small compared with the distance between the hypocenter to the station then the pattern of light waves that result can be said to be identical between the hypocenter. It can mean also that the two earthquakes recorded at the same station will contribute to the difference in the distance. Relocate hypocenter has done to micro earthquakes data geothermal field Kamojang. The results of Geiger method invers from the datas trying to be relocated using the velocity model that has been determined. The results show there is a collection of earthquakes relocation oriented in the south west area Kamojang. The results also indicate that the relocation of hypocenter distribution has not been able to describe the local structure associated with the fault as it is portrayed in the map of geological structure.

Keywords: Geothermal field Kamojang, Geiger method, double difference.

Penulis : Dedy Ismanto Hadi (H22107029)/Geofisika UNHAS

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