Estimasi Gelombang Geser dari Joint Inversion Kurva Dispersi dan HVSR di Institut Teknologi Sepuluh Nopember Surabaya

Ulya, Tuhfatul (2024) Estimasi Gelombang Geser dari Joint Inversion Kurva Dispersi dan HVSR di Institut Teknologi Sepuluh Nopember Surabaya. Other thesis, Institut Teknologi Sepuluh Nopember Surabaya.

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Abstract

Surabaya terletak pada sesar aktif yang menjadi pemicu terjadinya gempa besar yaitu Sesar Kendeng dan Sesar Waru yang membelah Kota Surabaya menjadi 2 bagian, utara dan selatan dengan magnitudo maksismum 6,5 SR. Oleh karena geografis yang rawan terhadap bencana, maka perlu dilakukan penelitian mengenai mitigasi dan analisis respon tanah di wilayah tersebut dengan menggunakan metode seismik yaitu metode MASW atau Multichannel Analysis of Surface Wave digunakan untuk memperoleh kurva disperse. Kurva ini bertujuan untuk memberikan penjelasan tentang persebaran kecepatan fase gelombang Rayleigh di bawah permukaan berdasarkan persebaran frekuensinya terhadap kedalaman. Sedangkan, metode HVSR atau Horizontal to Vertical Spectral Ratio digunakan untuk mengkarakterisasi struktur tanah dan mengestimasi indeks kerentanan tanah. Melalui metode Joint Inversion dari kurva dispersi dan kurva HVSR diperoleh model kecepatan gelombang geser (Vs) 1D yang menunjukkan 3 lapisan di kawasan Institut Teknologi Sepuluh Nopember Surabaya. Lapisan pertama menunjukkan Vs sebesar 74,10 m/s, lapisan kedua sebesar 75,66 m/s dan lapisan ketiga sebesar 259,98 m/s dengan densitas sama sebesar 1800 km/m3. Hasil inversi dispersi HVSR dan gelombang Rayleigh dengan menggunakan HVInv diperoleh hasil tidak akurat dikarenakan model inversi dari HVSR dan kurva dispersi cukup beda jauh pada perbedaan sensitivitas terhadap struktur bawah permukaan, dan asumsi model yang berbeda pada kurva HVSR.
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Surabaya is located on an active fault that triggers large earthquakes, namely the Kendeng Fault and the Waru Fault which divides Surabaya City into 2 parts, north and south with a maximum magnitude of 6.5 SR. Due to the disaster-prone geography, it is necessary to conduct research on mitigation and analysis of ground response in the region using seismic methods, namely the MASW method or Multichannel Analysis of Surface Wave used to obtain disperse curves. This curve aims to provide an explanation of the distribution of Rayleigh wave phase velocity in the subsurface based on the distribution of its frequency with depth. Meanwhile, the HVSR or Horizontal to Vertical Spectral Ratio method is used to characterize the soil structure and estimate the soil susceptibility index. Through the Joint Inversion on method of the dispersion curve and the HVSR curve, a 1D shear wave velocity (Vs) model was obtained that shows 3 layers in the area of Institut Teknologi Sepuluh Nopember Surabaya. The first layer shows a Vs of 74,10 m/s, the second layer of 75,66 m/s and the third layer of 259,98 m/s with the same density of 1800 km/m3. The results of the inversion of HVSR dispersion and Rayleigh waves using HVInv were inaccurate because the inversion model of HVSR and the dispersion curve were quite different due to differences in sensitivity to subsurface structures, and different model assumptions for the HVSR curve.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Shear Wave (Vs), Joint Inversion, Soil Characterization, Dispersion Curve, HVSR Curve, Gelombang Geser (Vs), Joint Inversion, Karakterisasi Tanah, Kurva Dispersi, Kurva HVSR.
Subjects:	Q Science > QE Geology > QE538.8 Earthquakes. Seismology Q Science > QE Geology > QE539.2.S4 Seismic models Q Science > QE Geology > QE601 Geology, Structural
Divisions:	Faculty of Science and Data Analytics (SCIENTICS) > Physics > 45201-(S1) Undergraduate Thesis
Depositing User:	Tuhfatul Ulya
Date Deposited:	24 Jul 2024 02:25
Last Modified:	24 Jul 2024 02:25
URI:	http://repository.its.ac.id/id/eprint/108665

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