Farkhan Raflesia, Raflesia and Nandi Haerudin, NH and Rustadi, Rustadi (2017) ANALISIS SEBARAN HIPOSENTER GEMPA MIKRO DAN POISSON’S RATIO DI LAPANGAN PANASBUMI DESERT PEAK SEBELUM DAN SESUDAH STIMULASI ENHANCED GEOTHERMAL SYSTEM (EGS). Jurnal Geofisika Eksplorasi, 3 (2). pp. 52-64. ISSN 2356-1599

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Abstract

A research has been conducted on analysis of hypocenter distribution and poisson's ratio in the Desert Peak Geothermal Field, the State of Nevada, USA. The purpose of this research is to make a hypocenter determination program using Graphical User Interfaces (GUI) in MATLAB, analyze hypocenter and poisson's ratio distribution. Methods of micro earthquake using natural seismic wave measurement sources that have a low frequency. Micro earthquake recording earthquakes (≤ 3 SR). The data used in this research are the micro earthquake data catalog of Desert Peak Geothermal Field before EGS (September 2008 to August 2010) and after EGS (March 2013 to February 2015). The data source is from Northern California Earthquake Data Center (NCEDC) and is secondary data covering the arrival time of P and S waves, station position and 1dimensional speed model. Hypocenter determination using the SED method with preliminary data of the arrival time of P and S waves, 1-dimensional speed model and station location (UTM X, UTM Y and elevation). While the determination of poisson's ratio using wadati diagram with initial data in the form of the difference between the arrival time of wave P and S with origin time. Determination of the hypocenter of micro earthquake successfully done using the GUI program in MATLAB developed by writer. The resulting hypocenter distribution follows the ryholite ridge fault groove which is the main location of Desert Peak Geothermal Field. After the EGS stimulation the micro earthquake distribution increased twice, with the highest increase being in the 500m elevation (EGS stimulation zone). An increase in the value of poisson's ratio after EGS stimulation, especially in the 500m elevation (EGS stimulation zone). This suggests an increase in water saturation in the EGS area after EGS stimulation

Item Type:	Article
Subjects:	Q Science > QE Geology
Divisions:	Fakultas Teknik (FT) > Prodi Teknik Geofisika
Depositing User:	RUSTADI
Date Deposited:	03 Apr 2023 01:44
Last Modified:	03 Apr 2023 01:44
URI:	http://repository.lppm.unila.ac.id/id/eprint/49572

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