Rahmaningtyas, Nur Isnaini (2020) Analisis Sumber Gempa Mikro melalui Distribusi Lokasi Hiposenter menggunakan Metode Double Difference pada Lapangan Panas Bumi “X”. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Monitoring sumber panas bumi perlu dilakukan untuk memaksimalkan kegiatan eksplorasi dan pemanfaatan sumber energi, dengan melihat adanya aktivitas yang terjadi dibawah permukaan yaitu gempa mikro. Penelitian ini bertujuan untuk melakukan uji lokasi distribusi hiposenter dari data gempa mikro dan menganalisis sumber gempa miko yang terjadi pada lapangan panas bumi “X”. Uji lokasi pada penelitian ini menggunakan metode Double Difference yang memiliki prinsip yaitu memasangkan event dengan jarak yang relatif kecil. Uji lokasi menggunakan metode ini dilakukan dengan 2 tahap yaitu clustering dan relokasi itu sendiri yang kemudian diplotting secara 2 Dimensi. Hasil relokasi hiposenter gempa mikro pada lapangan panas bumi “X” menunjukkan bahwa clustering terbagi menjadi 1 kelompok dengan jumlah event 260 data. Secara kuantitatif hasil relokasi hiposenter menggunakan metode Double Difference menghasilkan nilai eror yang jauh lebih kecil dibandingkan metode yang digunakan dalam penelitian sebelumnya yaitu Geiger Adaptive Damping. Metode Double Difference memiliki rata-rata nilai RMS eror sebesar 0.078 sedangkan, metode Geiger Adaptive Damping menghasilkan rata-rata nilai RMS eror sebesar 0.291. Secara kualitatif, hasil relokasi hiposenter secara 3 Dimensi terletak tepat dibawah jalur sumur pada daerah penelitian, hasil layout antara titik relokasi hiposenter dengan penampang 2D lintasan pengukuran metode Magnetotellurik. Lintasan C,D dan E menujukkan hasil hiposenter berada pada sumur PPL-04ST, PPL- 04AST, PPL-07, PPL-06, PPL-02AST, dan PPL02ST. Adanya titik relokasi hiposenter yang berada tepat dibawah jalur sumur produksi mengindikasikan adanya aktvitas pada zona tersebut seperti aliran-aliran fluida yang mengalir pada reservoir panas bumi. Maka dapat disimpulkan terjadinya event gempa mikro merupakan akibat adanya aktivitas-aktivitas produksi didalam sistem geothermal yang terjadi.
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Geothermal monitoring needs to be done to maximize exploration and utilization of energy sources by observing the activities that occur below the surface, namely the existence of micro earthquakes. This study aims to test the location of the hypocenter distribution from micro earthquake data and to analyze the source of the micro earthquake that occurred in the "X" geothermal field. The location test in this study uses the Double Difference method which has the principle of pairing events with relatively small distance. Location testing using this method is carried out in 2 stages, clustering and relocation itself which are then plotted in 2 & 3 Dimensions. The results of the micro earthquake hypocenter relocation in the geothermal field "X" indicate that clustering is divided into 1 group with 260 events. Quantitatively, the results of hypocenter relocation using the Double Difference method produce error values that are much smaller than the method used in previous studies, namely Geiger Adaptive Damping. The Double Difference method has an average error RMS value of 0.078 while the Geiger Adaptive Damping method produces an average error RMS value of 0.291. Qualitatively, the results of the 3-dimensional hypocenter relocation are located just below the well path in the study area, the results of the layout between the hypocenter relocation point and the 2D cross-section of the measurement path of the Magnetotelluric method. Line C, D and E show the results of the location hypocenter in wells PPL-04ST, PPL-04AST, PPL-07, PPL- 06, PPL-02AST, and PPL02ST. The presence of a hypocenter relocation point below the line of production well indicates there is an activity in the zone, such as fluid flows in the geothermal reservoir. The conclusion is the occurrence of micro earthquake events that occur is a result of production activities in the geothermal system that occurred.
| Item Type: | Thesis (Other) |
|---|---|
| Additional Information: | RSGf 550 Rah a-1 2020 |
| Uncontrolled Keywords: | Double Difference, Gempa Mikro, Hiposenter, Panasbumi |
| 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: | Nur Isnaini Rahmaningtyas |
| Date Deposited: | 13 Jan 2025 07:15 |
| Last Modified: | 13 Jan 2025 07:21 |
| URI: | http://repository.its.ac.id/id/eprint/74548 |
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