Rahman, Yungi Yudiar (2016) Analisis Waveform Tiga Komponen Untuk Inversi Momen Tensor Dan Penentuan Bidang Patahan Daerah Jepang. Masters thesis, Institut Teknologi Sepuluh Nopember Surabaya.
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Abstract
Perhitungan momen tensor dari 86 gempa bumi dengan magnitude lebih dari 5 Mj yang terjadi di Jepang sepanjang tahun 2015 dilakukan dengan menggunakan metode Inversi Grid Search dengan menggunakan data waveform seismogram 3 komponen yang terekam di 1 – 15 stasiun. Pencarian solusi terbaik dilakukan dengan menghitung semua nilai kemungkinan solusi berupa nilai strike dip dan rake dalam rentang kedalaman 1 – 110 km dengan interval 1 km. Solusi terbaik diketahui dengan nilai variansi reduksi yang merupakan ukuran kecocokan dari seismogram data observasi dengan seismogram sintetik yang didapat dari pemodelan ke depan menggunakan data hasil inversi dan mengoperasikan dengan fungsi Green yang sebelumnya telah dihitung menggunakan teknik wavenumber integration. Pembandingan antara seismogram sintetik dan observasi dilakukan pada frekuensi 0.01 – 0.03 Hz. Hasil perhitungan menunjukkan metode ini sangat efektif dalam memberikan solusi melihat nilai variansi reduksi yang bernilai di atas 0.5 didapatkan di setiap perhitungan. Dari hasil inversi ditentukan bidang patahan penyebab gempa dengan menggunakan teknik HC
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Moment tensor calculation for 86 event earthquake with magnitude more than 5 Mj occur in Japan in 2015 has done by using grid search inversion method. This method was applying using waveform three component that recorded in 1 – 15 stations. The best solution was obtained by calculating all the possibilities solution like strike, dip and rake within depth between 1 – 110 km with interval 1 km. The best solution known as the solution with highest value of variance reduction which is the match measurement between sintethyc and observed seismogram. The observed seismogram was obtained from forward modelling using inversion result that operating with the green function that calculated from wavenumber integration technique. The comparison between sintethyc and observed seismogram was done in frequency 0.01 – 0.03 Hz. The result of calculation show the value of reduction variance more than 0.5 which conclude that this inversion method was an efective method. From the inversion result, HC technique was used to obtaining the real fault plane that cause the earthquake
| Item Type: | Thesis (Masters) |
|---|---|
| Additional Information: | RTFi 557.3 Rah a |
| Uncontrolled Keywords: | bidang patahan, fungsi green, inversi momen tensor |
| Subjects: | Q Science > QE Geology > QE538.5 Seismic tomography; Seismic waves. Elastic waves |
| Divisions: | Faculty of Mathematics and Science > Physics > 45101-(S2) Master Thesis |
| Depositing User: | EKO BUDI RAHARJO |
| Date Deposited: | 13 Apr 2020 23:47 |
| Last Modified: | 13 Apr 2020 23:47 |
| URI: | http://repository.its.ac.id/id/eprint/75755 |
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