Analisa Momen Tensor Dan Pola Bidang Sesar Pada Zona Subduksi Di Wilayah Sumatera Barat Dari Event Gempa Pada Tahun 2014-2017

Salamah, Masyitatus Daris (2018) Analisa Momen Tensor Dan Pola Bidang Sesar Pada Zona Subduksi Di Wilayah Sumatera Barat Dari Event Gempa Pada Tahun 2014-2017. Undergraduate thesis, Institut Teknologi Sepuluh Nopember Surabaya.

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Abstract

Penelitian dengan fokus analisa momen tensor dan pola bidang patahan dapat dilakukan pada gempa bumi wilayah Sumatera barat pada tahun 2014-2017 dengan memanfaatkan program ISOLA-GUI. Prinsip program ini mengolah tiga komponen gelombang seismik yang terekam dalam seismogram. Data berupa gelombang diolah sesuai masing-masing event gempa yang terjadi dan digunakan perhitungan fungsi Green serta inversi. Pada tahap inversi digunakan 4 filter f1, f2, f3, f4 yang diisi sesuai event. Plotting untuk hasil dilakukan setelah tahap inversi dan didapatkan nilai variance reduction yang bernilai mendekati 1. Plot selanjutnya berupa nilai momen tensor beserta pola bidang patahan yang disimbolkan dengan beachball. Pengolahan tersebut dilakukan pada seluruh event gempa. Setelah perhitungan, pengolahan, dan interpretasi, maka nilai momen tensor yang diperoleh adalah M33=7.492e12 hingga 0.793e15, M11= 6.787e12 hingga 0.243e15, M22= 4.282 e12 hingga 0.013 e15 serta nilai M31= 4.220 e12 hingga 0.633e15 hingga, M32 = 0.496e12 hingga 0.225e15, M12= 0.068 e12 hingga 0.438e15, serta bentuk pola focal mechanism bidang sesar wilayah Sumatera Barat terdiri atas normal-slip dan sesar dalam (dip-slip) pada area Active Subduction, dan strike-slip, reverse fault serta oblique fault pada area Mentawai Fault. ============================================================================================================ The research with focus of moment tensor analysis and fault mechanism pattern have been measured by ISOLA-GUI program to earthquake events at west Sumatera region from earthqueake event on 2014-2017. This program’s principle is using three seismic component that recorded by seismogram. Data from seismogram as wavelength processed accordingly to each earthquake events and also processed using Green function with filter inversion. The filter inversion step used four filters such as f1, f2, f3, f4 that will be filled accordingly to each events. Plot for the result is done after the inversion and variance reduction value that close to 1 will be obtained. The next plot is about moment tensor value and also the fault plane pattern that symbolized by beachball. This process was done for whole of the earthquake events. After the measurement, processing and interpretating steps, then the result of moment tensor value M33= 7.492e12 to 0.793e15, M11 = 6.787e12 to 0.243e15, M22 = 4.282 e12 to 0.013 e15, M31 = 4.220 e12 to 0.633 e15 to, M32 = 0.496e12 to 0.225e15, M12 = 0.068 e12 to 0.438 e15As well as the fault pattern, the result is normal-slip reverse fault pattern at active subduction area and strike-slip so oblique fault pattern located at Mentawai Fault area.

Item Type: Thesis (Undergraduate)
Uncontrolled Keywords: ISOLA-GUI, fungsi Green, inversi, plotting beachball, normal-slip, strike-slip, oblique fault.
Subjects: Q Science
Q Science > QC Physics
Divisions: Faculty of Mathematics and Science > Physics > (S1) Undergraduate Theses
Depositing User: Masyitatus Daris Salamah
Date Deposited: 11 Apr 2018 01:55
Last Modified: 16 May 2018 03:30
URI: http://repository.its.ac.id/id/eprint/50281

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