Identifikasi Bidang Sesar Probolinggo dan Arah Fracture Di Zona Sesar Menggunakan Data Mikrotremor

Karokaro, Jeremy Reviel (2021) Identifikasi Bidang Sesar Probolinggo dan Arah Fracture Di Zona Sesar Menggunakan Data Mikrotremor. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Sesar Probolinggo secara adminstratif berada di Kabupaten Probolinggo, Jawa Timur. Kajian penelitian oleh PUSGEN pada tahun 2017 telah mengindentifikasi keberadaanya sebagai sesar aktif yang tergambar melalui visualisasi gawir sesar. Sesar Probolinggo telah teridentifikasi secara geomorfologi, namun tidak didukung dengan hasil data subsurface sebagai validasi. Oleh karena itu, dilakukanlah penelitian subsurface Sesar Probolinggo menggunakan pendekatan ilmu geofisika menggunakan metode mikrotremor. Penelitian ini memanfaatkan gelombang ambient noise . Jumlah titik data akusisi adalah 28 titik. Hasil akhir dari pengolahan data mikrotremor adalah mencari penampang bidang sesar dan arah dugaan fracture. Fitur pengolahan yang dipakai adalah HVSR,HV-Rotate, dan inversi OPEN-HVSR .Hasil pengolahan yang didapatkan berupa arah dugaan fracture, penampang bidang sesar , dan persebaran nilai frekuensi natural (f0)dan amplifikasi(A0). Dari hasil intepretasi , peta f0 menunjukkan adanya perbedaan kedalaman lapisan sedimen,dimana lapisan sedimen bagian selatan-barat sesar lebih tebal dibandingkan bagian utara sesar-barat, yang mengindikasikan adanya patahan.Didapatkan kemudian, arah polarisasi gelombang dominan membentuk arah N-S, sehingga didapatkan arah fracture , yaitu arah dominan E-W. penampang kecepatan gelombang Vs pada lintasan 1, lintasan 2, dan lintasan 3.Dari hasil inversi HVSR, didapatkan bidang sesar yang mengalami penurunan dibagian utara kontak sesar, dengan penurunan lapisan sekitar 100-200 meter.
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Probolinggo Fault administratively located in Probolinggo Regency, East Java. A research study by PUSGEN in 2017 has identified its presence as an active fault and illustrated through the visualization of the fault escarpment. The Probolinggo Fault has been proven geomorphologically, but is not supported by the results of subsurface data as validation. Therefore, a subsurface study of the Probolinggo Fault was carried out using a geophysical approach using the microtremor method. This research utilizes ambient noise waves . The number of acquisition data points are 28 points. The aim of microtremor data processing is to find a cross-section of the fault plane and the direction of the suspected fracture. Using the HVSR, HV-Rotate, and OPEN-HVSR inversion methods. The processing results obtained are the direction of the suspected fracture, the cross section of the fault plane, and added with the distribution of natural frequency values (f0) and amplification (A0). From the interpretation results, map f0 shows that there are differences in the depth of the sediment layers, where the sediment layer in the south-west of the fault is thicker than the north-west of the fault, which indicates a fault. Obtained later, the direction of the dominant wave polarization forms the N-S direction, so that the fracture direction is obtained, namely the dominant E-W direction..From HVSR inversion of the Vs wave velocity on track 1, track 2, and track 4, the fault plane is found, in the form of a descending segment in the northern part of the faul planet, with a subsidence of about 100-200 meters.

Item Type:	Thesis (Undergraduate)
Uncontrolled Keywords:	Spektrum H/V , polarisasi gelombang, frekuensi natural, sesar turun H/V spectrum, wave polarization, natural frequency, normal-fault
Subjects:	Q Science > QE Geology > QE538.5 Seismic tomography; Seismic waves. Elastic waves Q Science > QE Geology > QE601 Geology, Structural
Divisions:	Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Geophysics Engineering > 33201-(S1) Undergraduate Thesis
Depositing User:	Jeremy R Karokaro
Date Deposited:	26 Aug 2021 07:59
Last Modified:	26 Aug 2021 07:59
URI:	http://repository.its.ac.id/id/eprint/89654

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