Submawati, Depta Mahardika (2014) Estimasi Momen Tensor, Pola Bidang Sesar Dan Mekanisme Fokus Gempa Tohoku-Oki Jepang Pada Tahun 2011 Dengan Memanfaatkan Inversi Wavefrom Tiga Komponen Menggunakan Program Isola. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Penelitian mengenai mekanisme fokus gempa Tohoku-Oki telah dilakukan. Penelitian ini bertujuan untuk menentukan momen tensor, pola bidang sesar dan slip dari gempa bumi Tohoku-Oki menggunakan data gempa bumi foreshock dan aftershock. Digunakan 6 event gempa bumi masing-masing untuk foreshock dan aftershock dengan magnitudo diatas 4.5 SR. Penentuan momen tensor dilakukan dengan menggunakan inversi wavefrom tiga komponen dengan metode iterasi dekonvolusi menggunakan software ISOLA-GUI. Momen tensor menggambarkan gaya-gaya yang bekerja pada pusat sumber gempa bumi sedangkan slip menggambarkan besarnya displacement yang terjadi dikarenakan gempa bumi. Dari hasil inversi diperoleh solusi parameter sesar yaitu strike, dip dan rake untuk dua nodal yang akan dianalisa untuk menentukan bidang patahan. Hasil inversi momen tensor direpresentasikan dengan menggunakan beach ball yang menggambarkan daerah kompresi dan dilatasi. Dari penelitian ini diketahui jika pada gempa foreshock didominasi oleh sesar naik (reserve fault). Hal ini dikarenakan gempa Tohoku-Oki disebabkan oleh pertemuan lempeng Pasifik dan Okhslot membentuk zona subduksi Jepang trench. Sedangkan untuk gempa bumi aftershock disebabkan oleh dominasi sesar naik, dip slip reverse dan strike slip. Dari hasil penelitian ini didapatkan rentang momen tensor adalah Mrr = 2.223 exp15 sampai 1.611 exp19, Mtt = 0.456 exp15 sampai 1.166 exp19, Mpp = 2.679 exp15 sampai 2.777 exp19, Mrt = 2.649 exp15 sampai 5.561 exp19, Mrp = 3.386 exp15 sampai 0.119 exp19, dan Mtp= 1.343 exp15 sampai 1.039 exp19. Sedangkan untuk besarnya slip maksimum yaitu mencapai 49.38 m.
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This research discussed about determination of moment tensor and the pattern of fault plane from focal mechanism and slip from Tohoku-Oki earthquake using foreshock and aftershock event. Used six event of eartquake foreshock and aftershock with magnitudo greater than equal 4.5 SR. The determination of moment tensor has been done using wavefrom three component inversion with iteration deconvolution method by ISOLA progam. Moment tensor represent forces that exist in focus of earthquake. Whereas, slip represent size of displacement that were caused by earthquake. From inversion result were aimed fault parameter solution (strike, dip and rake) for two nodal. Inversion result of moment tensor were represented with beach balls that show compression and dilatation zone. From this research were known that the pattern fault in Japan espicially caused by Tohoku-Oki earthquake were dominated by reverse fault. This pattern fault were caused by subduction between Pasific dan Okhslot plate and formed Japan trench. Whereas, aftershock event were dominated by normal, dip slip reverse and strike slip fault. From this research also known range of moment tensor were Mrr = 2.223 exp15 to 1.611 exp19, Mtt = 0.456 exp15 to 1.166 exp19, Mpp = 2.679 exp15 to 2.777 exp19, Mrt = 2.649 exp15 to5.561 exp19, Mrp = 3.386 exp15 to 0.119 exp19, and Mtp = 1.343 exp15 to 1.039 exp19. Maximum slip was 49,38 m and minimum slip was 7.38m
| Item Type: | Thesis (Other) |
|---|---|
| Additional Information: | RSFi 557.3 Sub e |
| Uncontrolled Keywords: | : Gempa Tohoku-Oki, focal mechanism, momen tensor, reverse fault, normal fault, strike slip fault dan zona subduksi, Tohoku-Oki Earthquake, focal mechanism, moment tensor, reverse faults, normal fault, strike slip fault dan subduction zone. |
| Subjects: | Q Science > QE Geology > QE539.2.S4 Seismic models |
| Divisions: | Faculty of Science and Data Analytics (SCIENTICS) > Physics > 45201-(S1) Undergraduate Thesis |
| Depositing User: | Mr. Marsudiyana - |
| Date Deposited: | 24 May 2023 07:51 |
| Last Modified: | 07 Jun 2023 05:25 |
| URI: | http://repository.its.ac.id/id/eprint/97986 |
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