Pemodelan Inundasi Dan Run-Up Tsunami Di Pacitan Akibat Potensi Gempa Megathrust Segmen Jawa Timur Menggunakan Metode Cornell Multi-Grid Coupled

Aditama, Ferdian Yoga (2023) Pemodelan Inundasi Dan Run-Up Tsunami Di Pacitan Akibat Potensi Gempa Megathrust Segmen Jawa Timur Menggunakan Metode Cornell Multi-Grid Coupled. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Selama kurun waktu tahun 1600 hingga 2007 telah terjadi kurang lebih 109 tsunami di Indonesia dengan 90% diakibatkan gempa tektonik. Pacitan berada pada daerah tunjaman (subduction) yang sangat rawan terhadap gempabumi dan tsunami. Kondisi morfologi pesisir Pacitan berpotensi besar terhadap bahaya tsunami. Penelitian ini bertujuan untuk melakukan pemodelan tsunami yang dibangkitkan oleh gempa hipotetik megathrust segmen Jawa Timur berkekuatan Mw 8.7. Metode yang digunakan Cornell-Multi Grid Coupled dengan software COMCOT 1.7. Sistem nested grid menggunakan 4-layer terdiri dari 1-layer GEBCO, 2-layer batimetri, dan 1-layer integrasi untuk menghasilkan pemodelan tsunami dengan resolusi yang tinggi. Hasil penelitian menunjukkan skenario gempa hipotetik megathrust segmen Jawa Timur menyebabkan vertical displacement pada permukaan laut sebesar -4.599 m hingga 7.019 m. Propagasi tsunami ke arah utara menuju pesisir Pacitan memiliki amplitudo maksimum 33.16 m dengan waktu tempuh 23 – 29 menit kemudian menyebar ke segala arah. Jangkauan inundasi terjauh terjadi di Kecamatan Pacitan sejauh 4.189 km ke arah utara Pantai Ranuharjo, sedangkan run-up maksimum 21.82 m terjadi di Pantai Soge Kecamatan Ngadirojo. Area terdampak inundasi terjauh di Kecamatan Pacitan morfologi miring landai dengan kelerengan 0-8%, dan run-up tertinggi di Kecamatan Ngadirojo morfologi miring sedang hingga terjal dengan kelerengan lebih dari 25%. Berdasarkan peta bahaya tsunami, Kecamatan Pacitan memiliki luasan area terdampak inundasi paling luas 21.63 km2, sedangkan luasan area inundasi terkecil di Kecamatan Tulakan 0.33 km2.
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During the period 1600 to 2007 there have been approximately 109 tsunamis in Indonesia with 90% caused by tectonic earthquakes. Pacitan located in a subduction area which is very prone to earthquakes and tsunamis. The coastal morphology of Pacitan has great potential for tsunami hazard. This research is focused on conducting modeling of the tsunami generated by the hypothetical megathrust earthquake in the East Java segment with a magnitude of Mw 8.7. The method used is Cornell-Multi Grid Coupled with COMCOT 1.7 software. The nested grid system uses a 4-layer consisting of 1-layer GEBCO, 2-layer bathymetry, and 1-layer integration to produce tsunami modeling with high resolution. The results showed that the megathrust hypothetical earthquake scenario for the East Java segment caused a vertical displacement at sea level of -4.599 m to 7.019 m. The tsunami propagation northwards towards the Pacitan coast had a maximum amplitude of 33.16 m with a travel time of 23 – 29 minutes and then spreads in all directions. The farthest inundation range occurred in Pacitan Subdistrict as far as 4.189 km to the north of Ranuharjo Beach, while the maximum run-up of 21.82 m occurred in Soge Beach, Ngadirojo Subdistrict. The farthest affected area of inundation occurs in Pacitan Subdistrict with a gently sloping morphology of 0-8%, the highest run-up is in Ngadirojo Subdistrict with a moderate to steep sloping morphology of more than 25%. Based on the tsunami hazard map, Pacitan Subdistrict had the largest inundated area of 21.63 km2, while the smallest inundation area is in Tulakan Subdistrict 0.33 km2.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	COMCOT, Inundasi dan Run-up Tsunami, Megathrust, Pacitan; COMCOT, Tsunami Inundation and Run-up, Megathrust, Pacitan
Subjects:	H Social Sciences > HV Social pathology. Social and public welfare > HV551.5.I4 Hazard mitigation Q Science > Q Science (General) > Q180.55.M38 Mathematical models
Divisions:	Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Geophysics Engineering > 33201-(S1) Undergraduate Thesis
Depositing User:	Ferdian Yoga Aditama
Date Deposited:	05 Oct 2023 04:14
Last Modified:	05 Oct 2023 04:14
URI:	http://repository.its.ac.id/id/eprint/103155

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