Menentukan Parameter Magnitudo Melalui Pendekatan Empiris Sebagai Acuan Estimasi Nilai Dimensi Patahan Pada Lapangan Panas Bumi X

Rosvin, Milania Annisa (2022) Menentukan Parameter Magnitudo Melalui Pendekatan Empiris Sebagai Acuan Estimasi Nilai Dimensi Patahan Pada Lapangan Panas Bumi X. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Analisis seismogram sudah banyak dilakukan terutama pada data seismogram gampa bumi dengan tujuan menghitung nilai magnitudo. Metode microearthquake digunakan untuk mengidentifikasi gempa kecil yang sering diterapkan di lapangan panas bumi. Dalam penelitian ini akan dilakukan dua tahapan utama berupa persiapan data dan pengolahan data. Raw data berupa waveform tiga komponen hasil pengukuran metode microearthquake yang dilakukan selama 10 hari dengan durasi 24 jam tiap harinya. Persiapan data dilakukan dengan memproses raw data melalui dua software, yaitu Seisgram2k dan GAD sehingga didapatkan nilai arrival time dan kedalaman gempa. Pengolahan data lebih lanjut diawali dengan pengolahan pada Geopsy untuk mendapatkan nilai amplitudo, frekuensi, dan periode. Variabel yang belum didapatkan nilainya, akan dihitung melalui Excel 2016 dengan pendekatan empiris. Setelah semua variabel yang diperlukan dalam persamaan telah didapatkan, perhitungan nilai magnitudo dilakukan melalui pendekatan empiris yang dihitung dalam Excel 2016 hingga didapatkan nilai dari magnitudo momen untuk dijadikan acuan dalam perhitungan estimasi nilai dimensi patahan. Dari hasil perhitungan didapatkan empat macam nilai parameter magnitudo, yaitu magnitudo lokal bernilai 0.195 – 1.169, magnitudo body bernilai 0.995 – 1.643, magnitudo permukaan bernilai 0.412 – 1.077, dan magnitudo momen bernilai 0.811 – 1.100. Nilai dari magnitudo momen dijadikan acuan dalam perhitungan nilai dimensi patahan dan didapatkan dua macam estimasi nilai dimensi, yaitu dimensi strike-slip dengan panjang 0.176 km; luas 0.135 km2 ; dan lebar 0.762 km dan dimensi dip-slip di zona subduksi dengan panjang 0.197 km; luas 0.145 km2 ; dan lebar 0.733 km. Setelah diketahui nilai dimensi patahan dari semua event, dilakukan pemetaan estimasi perubahan nilai dimensi patahan guna dijadikan sebagai data pendukung dalam penentuan jalur injeksi fluida.
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Seismogram analysis has been carried out, especially on earthquake seismogram data to calculate the magnitude value. The microearthquake method is used to identify small
earthquakes that are often applied in geothermal fields. In this study, two main steps will be done in the form of data preparation and data processing. Raw data in the form of three�component waveform measurement results from the microearthquake method which was carried out for 10 days with a duration of 24 hours each day. Data preparation was done by
processing raw data through two software, namely Seisgram2k and GAD so that the arrival time and earthquake depth values were obtained. Further data processing begins with processing on Geopsy to get the values for amplitude, frequency, and period. Variables whose values have not been obtained will be calculated through Excel 2016 with an empirical approach. After all the variables needed in the equation have been obtained, the calculation of the magnitude value being estimated through an empirical approach which is calculated in Excel 2016 until the value of the moment magnitude is obtained to be used as a reference in calculating the estimated value of the fault dimension. From the calculation results obtained four kinds of magnitude parameter values, they are the local magnitude is 0.195 – 1.169, the body magnitude is 0.995 – 1.643, the surface magnitude is 0.412 – 1.077, and the moment magnitude is 0.811 – 1.100. The value of the moment magnitude is used as a reference in calculating the value of the fault dimension and two kinds of dimension value estimates are obtained, they are the strike-slip dimension with a length of 0.176 km; area 0.135 km2; and
0.762 km wide and dip-slip dimensions in the subduction zone with a length of 0.197 km; area 0.145 km2; and 0.733 km wide. After knowing the value of the fault dimensions from all events, an assessment of the change in the value of the fault is carried out to serve as supporting data in the fluid injection path.

Item Type:	Thesis (Other)
Additional Information:	RSGf 551.22 Ros m-1 2022
Uncontrolled Keywords:	Panas bumi, Microearthquake, Magnitudo, Dimensi Patahan
Subjects:	Q Science > QE Geology > QE538.8 Earthquakes. Seismology
Divisions:	Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Geophysics Engineering > 33201-(S1) Undergraduate Thesis
Depositing User:	- Davi Wah
Date Deposited:	20 Nov 2023 03:50
Last Modified:	20 Nov 2023 03:50
URI:	http://repository.its.ac.id/id/eprint/105131

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