Siregar, Naomi Nadya Angelia (2019) Penentuan Lokasi Hiposenter Gempa Bumi Mikro Menggunakan Metode Geiger Dengan Arrival Times P-wave Dan S-Wave Berdasarkan S-Transform. Other thesis, Institut Teknologi Sepuluh Nopember.
![[thumbnail of 03411540000051-Undergraduate_Theses.pdf]](http://repository.its.ac.id/style/images/fileicons/text.png) |
Text
03411540000051-Undergraduate_Theses.pdf Restricted to Repository staff only Download (2MB) | Request a copy |
Abstract
Gempa bumi mikro menjadi salah satu metode monitoring pasif untuk pemetaan zona rekahan pada daerah panas bumi, menentukan batas reservoir, dan zona permeabel. Identifikasi rekahan diawali dengan menentukan lokasi hiposenter gempa bumi mikro. Metode Geiger merupakan salah satu metode yang mengimplementasikan algoritma iterative least square dengan data masukkan yang digunakan yaitu arrival time P-wave dan/atau S-wave, model kecepatan, koordinat stasiun pencatat gempa. Proses identifikasi gelombang untuk memperoleh arrival times ini menjadi sulit jika sinyal mengandung noise dan tingkat subjektifitas yang tinggi untuk mengidentifikasi sinyal terutama S-wave. Oleh karena itu, dalam penelitian ini digunakan S-Transform (Stockwell Transform) yang menampilkan spektrum amplitudo seismogram untuk mendapatkan arrival times yang kemudian diolah dengan metode Geiger dan dihasilkan 47 titik hiposenter, origin time, serta nilai error. Proses ini menunjukkan nilai error mengalami penurunan sebesar 51% pada titik hiposenter gempa bumi mikro dari penggunaan arrival times berdasarkan kualitatif. Distribusi hiposenter pada sistem panas bumi menunjukkan lokasi kejadian gempa bumi mikro menunjukkan keaktifan pada sumur PPL-04ST (sumur produksi) dan PPL-04AST (idle well) yang mengindikasikan pergerakan aliran fluida pada reservoir sistem panas bumi tersebut.
===================================================================================================================================
Micro-earthquake is one of passive monitoring methods for mapping fracture zones in geothermal, determining reservoir boundaries and permeable zone. The identification of fractures began by determining the hypocenter location of micro-earthquakes. The Geiger method is one of a method that implemented an iterative least square algorithm by using some input data, which are the arrival times of P-wave and /or S-wave, velocity model, and coordinates of the earthquake recording station. The wave arrival time identification process was considered difficult if the signal contained noise and high level of subjectivity to identify signals especially S-wave. Therefore, this study used an S-Transform (Stockwell Transform) that shows spectrum amplitde of seismogram to obtain the arrival times and then processed by using the Geiger method which produced 47 hypocenter locations, origin time, and an error value. This process showed that the error value has decreased by 51% at the hypocenter location of the micro-earthquake from qualitative arrival times analysis. The hypocenters distribution in geothermal system showed that activity of micro-earthquakes were in PPL-04ST wells (production wells) and PPL-04AST (idle wells) which indicate the movement of fluid flow in the geothermal resevoir.
| Item Type: | Thesis (Other) |
|---|---|
| Additional Information: | RSGf 624.176 2 Sir p-1 2019 3100019080985 |
| Uncontrolled Keywords: | Gempa Bumi Mikro, Hiposenter, Metode Geiger, S-Transform |
| Subjects: | Q Science > Q Science (General) > Q325 GMDH algorithms. Q Science > QE Geology > QE538.8 Earthquakes. Seismology T Technology > T Technology (General) > T57.5 Data Processing |
| Divisions: | Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Geophysics Engineering > 33201-(S1) Undergraduate Thesis |
| Depositing User: | Naomi Nadya Angelia Siregar |
| Date Deposited: | 04 Dec 2025 07:40 |
| Last Modified: | 04 Dec 2025 07:40 |
| URI: | http://repository.its.ac.id/id/eprint/64728 |
Actions (login required)
 |
View Item |