Current Deformation Analysis In Western Java Utilizing Cors Data At 2017-2022

Ramadhan, Muhammad Rivan Genta (2023) Current Deformation Analysis In Western Java Utilizing Cors Data At 2017-2022. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Pengaturan tektonik Indonesia dikelilingi oleh 3 lempeng tektonik, Indo-Australia, Eurasia, dan lempeng Pasifik. Wilayah Indonesia merupakan wilayah aktif dengan tingkat seismik yang tinggi. Gempa terkuat yang pernah tercatat oleh pengamatan seismik adalah Mw 9,15 Aceh yang terjadi pada tahun 2004. Banyak gempa bumi dahsyat terjadi di Sumatera; namun, Pulau Jawa juga mengalami banyak gempa. Selain itu, tidak adanya gempa di Jawa tetapi banyak gempa di daratan. BMKG kembali mencatat gempa kuat setelah 2 tahun, gempa tektonik terjadi di selatan Pulau Jawa, Jawa Barat dengan kekuatan Mw 6,8, yaitu gempa Pangandaran. Gempa terbaru merupakan Gempa Cianjur dengan kekuatan Mw 5,6. Mitigasi diperlukan untuk mengurangi risiko bencana alam, bahkan untuk menghilangkan dampak yang mungkin ditimbulkan oleh bencana alam. Bencana alam seperti gempa bumi dapat mempercepat proses deformasi. GPS bisa menjadi pilihan mitigasi karena GPS mampu memantau dan menganalisis deformasi secara real-time, bahkan ketika gempa terjadi. Hasil penelitian menunjukkan perpindahan kecepatan horizontal bervariasi, kisaran perpindahan kecepatan horizontal stasiun CORS adalah 19,59 mm/tahun – 31,09 mm/tahun dari tahun 2017-2022, dipengaruhi oleh pergerakan Blok Sunda. Setelah Reduksi Model Blok Sunda, kisaran nilainya bervariasi dari 0,15 mm/tahun hingga 6,96 mm/tahun. Analisis regangan di sisi barat Jawa, beberapa stasiun di timur mayoritas mengalami lebih banyak kompresi daripada ekstensi. Hasil analisis regangan menghasilkan regangan geser dan laju dilatasi maksimum. Hasil penelitian ini dapat dijadikan bahan pertimbangan dan kontribusi dalam analisis bahaya seismik sebagai bagian dari mitigasi bencana di Jawa Barat ke depan.
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Tectonic setting of Indonesia is surrounded by 3 plates tectonic, Indo-Australia, Eurasia, and Pacific plate. Indonesia territory is an active area with high seismic level. The strongest ever recorded by seismic observation was Mw 9.15 Aceh occurred on 2004. Many destructive earthquakes occurred in Sumatra; however, Java Island also experienced earthquakes afterwards. Moreover, there is an absence of earthquake in Java, but many earthquakes in land. BMKG recorded another strong earthquake after 2 years, tectonic earthquake occurred at south of Java Island, Western Java with a strength of Mw 6.8, namely Pangandaran earthquake. The latest was Cianjur earthquake with a strength of Mw 5.6. Mitigation is needed in order to reduce the risk of natural disaster, even to eliminate the impacts that may be caused by natural disasters. Natural disasters such as earthquake can accelerate the deformation process. GPS could be an option for mitigation because GPS able to monitor and analyze deformation in real-time, even when the earthquake occurred. Result of the research show the horizontal velocity displacement varies, the range of horizontal velocity displacement of CORS stations is 19.59 mm/year – 31.09 mm/year from 2017-2022, affected by Sunda Block movement. After Sunda Block Model Reduction, the range of the value is varying from 0.15 mm/year until 6.96 mm/year. Strain analysis in western side of Java, several stations on the east majority experiencing more compression than extension. The result of strain analysis generates maximum shear strain and dilatation rate. This research result can be taken into consideration and contributed to the seismic hazard analysis as part of disaster mitigation in western java in the future.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Deformation, GPS, CORS, Western Java; Deformasi, GPS, CORS, Jawa Bagian Barat
Subjects:	G Geography. Anthropology. Recreation > G Geography (General) > G109.5 Global Positioning System Q Science > QE Geology > QE604 Deformation
Divisions:	Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Geomatics Engineering > 29202-(S1) Undergraduate Thesis
Depositing User:	Muhammad Rivan Genta Ramadhan
Date Deposited:	09 Oct 2023 05:38
Last Modified:	09 Oct 2023 05:38
URI:	http://repository.its.ac.id/id/eprint/102744

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