Grania, Meindy Fortunawati (2017) Estimasi Pola Bidang Sesar Dan Momen Tensor Gempa Bumi Wilayah Fukushima Jepang Pada Tahun 2016. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Jepang merupakan negara yang wilayahnya terdapat empat lempeng tektonik aktif yang bertemu satu sama lain sehingga dilakukan penelitian mengenai mekanisme fokus pada gempa bumi Fukushima, Jepang yang bertujuan untuk menentukan nilai momen tensor, jenis pola bidang sesar dan besar slip dengan menggunakan 9 event gempa bumi dengan magnitudo diatas 4.7 SR. Penenetuan nilai momen tensor dilakukan dengan menggunakan inversi tiga waveform komponen dengan metode iterasi dekonvolusi menggunakan program ISOLA-GUI yang dijalankan oleh Matlab. Dari hasil inversi didapatkan parameter sesar yaitu strike, dip dan rake untuk dua nodal yang akan dianalisa untuk menentukan bidang patahan. Hasil dari inversi momen tensor direpresentasikan dengan menggunakan beachball yang menggambarkan daerah kompresi dan dilatasi. Dari pengolahan data diperoleh bahwa gempa Fukushima disebabkan oleh patahan yang terdapat pada litosfer benua yang menyebabkan terjadinya gempa bumi. Pola bidang sesar yang terjadi didominasi sesar normal (normal fault) dan sesar naik (reverse fault) dengan rentang nilai momen tensor Mrr = 0.055 exp15 sampai 9.522 exp17, Mtt = 0.116 exp15 sampai 2.345 exp17, Mpp= 0.035 exp15 sampai 5.735 exp17, Mrt= 0.165 exp15 sampai 2.268 exp17, Mrp = 0.222 exp15 sampai 5.640 exp17, Mtp = 0.086 exp15 sampai 4.585 exp17. Sedangkan untuk besarnya slip maksimum yaitu mencapai 1100 m.
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Japan is a country where there are four active tectonic plates that meet each other so that research is conducted on the mechanism of focus on the earthquake Fukushima, Japan which aims to determine the value of tensor moment, type of pattern of fault and large slip by using 9 earthquake events with magnitude above 4.7 SR. The identification of tensor moment values is performed by inversion of three component waveforms by deconvolution iteration method using ISOLA-GUI program run by Matlab. From the inversion result, the parameters of fault are strike, dip and rake for two nodes that will be analyzed to determine the fault area. The result of a tensor moment inversion is represented by using a beachball depicting the compression and dilatation areas. From the data processing it was found that the Fukushima earthquake was caused by a fracture found in the continental lithosphere that caused the earthquake. The pattern of cesarean field that occurs is dominated by normal fault and reverse fault with tensor moment value range of Mrr = 0.055 exp15 to 9,522 exp17, Mtt = 0.116 exp15 to 2,345 exp17, Mpp = 0.035 exp15 to 5,735 exp17, 0.165 exp15 to 2,268 exp17, Mrp = 0.222 exp15 to 5,640 exp17, Mtp = 0.086 exp15 to 4,585 exp17. As for the maximum slip that reaches 1100 m.
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Additional Information: | RSFi 551.22 Gra e-1 3100018075085 |
| Uncontrolled Keywords: | Gempa Fukushima; mekanisme fokus; momen tensor; Focal mechanism; Fukushima earthquake; moment tensor |
| Subjects: | G Geography. Anthropology. Recreation > G Geography (General) > G70.212 ArcGIS. Geographic information systems. G Geography. Anthropology. Recreation > GB Physical geography Q Science > QE Geology > QE601 Geology, Structural |
| Divisions: | Faculty of Mathematics and Science > Physics > 45201-(S1) Undergraduate Thesis |
| Depositing User: | Meindy Fortunawati Grania |
| Date Deposited: | 09 Apr 2018 04:18 |
| Last Modified: | 24 Sep 2020 05:04 |
| URI: | http://repository.its.ac.id/id/eprint/50539 |
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