Rasimeng, Syamsurijal and Suharno, Suharno and zaenudin, ahmad and Maulida, Nanda Hanyfa (2016) Three Dimensional Tomography Based on Microearthquake Data at Brady’s Hot Spring Geothermal Field, Nevada. In: The 4th Indonesia International Geothermal Convention & Exhibition 2016, 10-12 Agustus 2016, Jakarta Convention Center.


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Microearthquake activity in the geothermal field is related to reservoir and sub-surface structure. According to the data recorded, Brady’s Hot Spring which is a non-magmatic convection-dominated geothermal play system has high seismicity. Three-dimensional Vp anomaly, Vs anomaly, and Vp/Vs-ratio structure are presented for The Brady’s Hot Spring geothermal field using microearthquake travel-time data. The data were recorded by the Northern California Earthquake Data Center (NCEDC) using 8 stations seismic network. In addition, it uses 1D velocity models data and coordinates of the station as supporting data. The data proceed by Lotos 13 consists of determining preliminary location, relocating microearthquake source and inverting tomography by LSQR iterative method, then visualizing the model. The results indicate high Vp anomaly (5% to 25%) and low Vs anomaly (0% to -15%) in high seismicity zone. It also indicates high Vp/Vs (1.8 to 2.3) in the central section of The Brady’s around high seismicity zone and low Vp/Vs (1.4 to 1.7) below manifestation zone. High and low Vp/Vs-ratios are related to water and steam saturated zones, respectively. Interpretation shows that the reservoir area has high seismicity between 300 to 1400 meters depth, high permeability, and Brady’s Hot Spring main reservoir is in water dominated. As it seen in the result, with tomography inversion we succeed to get very detail seismicity and anomaly velocity distribution related to the reservoir in Brady’s Hot Spring, Nevada

Item Type: Conference or Workshop Item (Paper)
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TN Mining engineering. Metallurgy
Divisions: Fakultas Teknik (FT) > Prodi Teknik Geofisika
Date Deposited: 08 Jun 2021 06:35
Last Modified: 08 Jun 2021 06:35
URI: http://repository.lppm.unila.ac.id/id/eprint/32282

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