Mauradhia, Andika (2019) Analisis Deformasi dan Potensi Gempa di Kota Surabaya Menggunakan Data GPS. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Indonesia adalah negara kepulauan yang dikelilingi oleh Lempeng Eurasia, Lempeng Indo-Australia, Lempeng Laut Filipina, dan Lempeng Pasifik. Interaksi antar lempeng tersebut menyebabkan Indonesia rawan akan bencana gempa bumi, gunung api, dan tsunami. Kota Surabaya adalah ibu kota Provinsi Jawa Timur sekaligus kota metropolitan kedua terbesar di Indonesia. Salah satu ancaman bencana di wilayah Surabaya berasal dari sesar Kendeng yang dapat menyebabkan terjadinya gempa bumi. Salah satu langkah awal mitigasi bencana gempa yang dapat dilakukan adalah menganalisis potensi gempa di wilayah tersebut. Untuk menganalisis potensi gempa pada suatu wilayah dapat dilakukan dengan pemantauan deformasi menggunakan data Global Positioning System (GPS). Dari hasil dan analisis pengolahan data pengamatan GPS sebanyak 3-4 kala, diperoleh nilai kecepatan pergeseran dan regangan. Pergeseran horizontal titik-titik pengamatan GPS dominan menuju ke arah tenggara dengan rentang nilai kecepatan pergeseran antara 1,034 cm/tahun hingga 5,674 cm/tahun. Pada pergeseran vertical, titik-titik selain BM23, BM29, dan BM24 mengalami subsidence dengan rentang nilai kecepatan pergeseranan antara -0,190 cm/tahun hingga -5,769 cm/tahun. Perhitungan regangan menghasilkan tingkat ekstensi di Kota Surabaya berkisar antara 0,012 hingga 8,697 μstrain dan tingkat kompresi dengan rentang nilai 0,190 hingga 11,950 μstrain. Sehingga dapat disimpulkan Kota Surabaya memiliki potensi gempa yang perlu diwaspadai, terutama dari wilayah Surabaya Barat karena adanya aktivitas sesar dan didominasi oleh tingkat kompresi yang lebih besar daripada wilayah lain.
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Indonesia is an archipelago surrounded by the Eurasian Plate, the Indo-Australian Plate, the Philippine Sea Plate, and the Pacific Plate. Interaction between these plates is causing Indonesia to be prone to earthquakes, volcanoes and tsunamis. Surabaya City is the capital of East Java Province as well as the second largest metropolitan city in Indonesia. One of the disaster threats in the Surabaya City came from the Kendeng fault which could cause an earthquake. One of the first steps in earthquake disaster mitigation that can be done is to analyze the potential of earthquakes in the region. To analyze the potential of earthquakes in an area can be done by observing deformation using Global Positioning System (GPS) data. From the results and analysis of GPS data processing, the values of shift velocity and strain are obtained. The horizontal shift of the dominant GPS observation points towards the southeast with a range of values of shifting speeds between 1.034 cm/year to 5.674 cm/year. In vertical shifts, points other than BM23, BM29, and BM24 experience subsidence with a range of displacement velocities between -0.190 cm/year to -5.769 cm/year. The resulting strain calculation extension level in the city of Surabaya ranges from 0.012 to 8.697 μstrain and the level of compression with a range of values between 0.190 to 11.950 μstrain. So it can be concluded that Surabaya City has the potential for earthquakes to watch out for, especially from the West Surabaya region due to fault activity and is dominated by a greater compression level than other regions.
| Item Type: | Thesis (Other) |
|---|---|
| Additional Information: | RSG 526.6 Mau a-1 2019 |
| Uncontrolled Keywords: | Potensi Gempa, Deformasi, GPS, Kecepatan, Regangan |
| Subjects: | G Geography. Anthropology. Recreation > G Geography (General) > G109.5 Global Positioning System Q Science > QE Geology > QE538.8 Earthquakes. Seismology Q Science > QE Geology > QE604 Deformation |
| Divisions: | Faculty of Civil Engineering and Planning > Geomatics Engineering > 29202-(S1) Undergraduate Thesis |
| Depositing User: | Andika Mauradhia |
| Date Deposited: | 21 Dec 2023 03:25 |
| Last Modified: | 21 Dec 2023 03:25 |
| URI: | http://repository.its.ac.id/id/eprint/65493 |
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