Miftahurrahman, Miftahurrahman (2025) Analisis Deformasi Wilayah Sumatra Bagian Tengah menggunakan Data GNSS Tahun 2020-2024. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Wilayah Sumatra bagian tengah yang mencakup Sumatra Barat, sebagian Riau, dan Jambi, berada di zona tektonik aktif akibat subduksi Lempeng Indo-Australia ke bawah Lempeng Eurasia. Akumulasi tegangan akibat proses subduksi ini menghasilkan deformasi tektonik berupa regangan (strain), yang dapat diamati melalui data pengukuran geodetik. Studi ini bertujuan untuk menganalisis kecepatan dan arah pergeseran stasiun GNSS, pola regangan (strain), serta estimasi geodetic moment rate menggunakan data GNSS periode 2020–2024 dari 38 stasiun jaringan InaCORS dan SuGAr. Pengolahan data dilakukan dengan metode statik menggunakan perangkat lunak GAMIT/GLOBK untuk mendapatkan koordinat dan kecepatan pergerakan stasiun pengamatan. Kecepatan horizontal yang diperoleh dari stasiun GNSS digunakan sebagai dasar untuk menghitung distribusi regangan (strain) yang terjadi di wilayah studi. Estimasi geodetic moment rate dihitung menggunakan strain rate tensor untuk memproyeksikan akumulasi energi gempa. Hasil menunjukkan kecepatan horizontal stasiun berada pada rentang 24,33 hingga 52,69 mm/tahun dengan arah dominan ke timur laut, mengindikasikan deformasi signifikan di sepanjang zona subduksi. Setelah koreksi rotasi blok Sunda, arah kecepatan lokal bergeser ke utara hingga timur laut. Kecepatan vertikal menunjukkan dominasi subsidence (hingga –34,50 mm/tahun) dan uplift lokal (hingga 55,70 mm/tahun). Distribusi strain menunjukkan pola kompresi dominan di zona barat akibat interseismic locking di zona subduksi, pola deformasi bervariasi tanpa arah dominan di zona tengah karena pengaruh kombinasi gaya subduksi dan Sesar Sumatra, serta pola ekstensi di zona timur yang dipengaruhi oleh keterbatasan data dan tidak adanya aktivitas gempa besar secara historis. Estimasi geodetic moment rate mencapai 4,115 × 10¹⁹ Nm/tahun. Apabila akumulasi energi ini dilepaskan, maka berpotensi menghasilkan gempa dengan magnitudo maksimum antara Mw 8,14 (akumulasi 50 tahun) hingga Mw 8,54 (200 tahun). Temuan ini menekankan pentingnya pemantauan deformasi berkelanjutan dan penguatan strategi mitigasi risiko gempa di wilayah rawan Sumatra bagian tengah.
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The central part of Sumatra, which includes West Sumatra, parts of Riau, and Jambi, lies within an active tectonic zone due to the subduction of the Indo-Australian Plate beneath the Eurasian Plate. Stress accumulation from this subduction process generates tectonic deformation in the form of strain, which can be observed through geodetic measurements. This study aims to analyze the velocity and direction of GNSS station displacements, strain patterns, and estimate the geodetic moment rate using GNSS data from 38 stations of the InaCORS and SuGAr networks collected between 2020 and 2024. Static processing was carried out using the GAMIT/GLOBK software to obtain station coordinates and horizontal velocities. The horizontal velocities were then used to calculate strain distribution across the study area. The geodetic moment rate was estimated using strain rate tensor calculations to project the accumulation of seismic energy. The results show that horizontal velocities range from 24.33 to 52.69 mm/year, predominantly directed toward the northeast, indicating significant deformation along the subduction zone. After correcting for Sunda block rotation, local velocity vectors shift toward the north to northeast. Vertical velocities indicate dominant subsidence (up to –34.50 mm/year) and localized uplift (up to 55.70 mm/year). Strain distribution reveals dominant compressional strain in the western zone caused by interseismic locking along the subduction interface, mixed deformation patterns in the central zone influenced by both subduction and inland fault systems, and extensional strain in the eastern zone, likely due to interpolation effects related to sparse station coverage and the lack of major historical earthquakes in that region. The estimated geodetic moment rate reaches 4.115 × 10¹⁹ Nm/year. If this accumulated energy is released, it may generate earthquakes with magnitudes ranging from Mw 8.14 (over 50 years) to Mw 8.54 (over 200 years). These findings highlight the importance of continued deformation monitoring and strengthening seismic risk mitigation strategies in this vulnerable region of central Sumatra.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Deformasi, GNSS, Strain rate, Geodetic moment rate, Sumatra bagian tengah, Deformation, GNSS, Strain rate, Geodetic moment rate, Central Sumatra region. |
| Subjects: | G Geography. Anthropology. Recreation > G Geography (General) > G109.5 Global Positioning System G Geography. Anthropology. Recreation > GB Physical geography > GB651 Subsidences (Earth movements) Q Science > QE Geology > QE538.8 Earthquakes. Seismology Q Science > QE Geology > QE604 Deformation |
| Divisions: | Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Geomatics Engineering > 29202-(S1) Undergraduate Thesis |
| Depositing User: | Miftahurrahman Miftahurrahman |
| Date Deposited: | 25 Jul 2025 03:18 |
| Last Modified: | 25 Jul 2025 03:18 |
| URI: | http://repository.its.ac.id/id/eprint/121767 |
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