Fahmi, Muhammad Nurul (2021) Identifikasi Bidang Patahan Teraktifkan dengan Arah Rupture Menggunakan Metode Inversi Levenberg-Marquardt. Masters thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Arah rupture dapat digunakan untuk mereduksi masalah ambiguitas bidang patahan, yaitu dalam hal menentukan bidang patahan yang teraktifkan. Perambatan rupture yang melewati patahan diindikasikan penyebab dari gempa bumi. Arah rupture dan bidang patahan teraktifkan sangat penting untuk memprediksi getaran tanah dan mitigasi bencana. Dalam hal ini, arah rupture dan bidang patahan teraktfikan dapat diestimasi menggunakan durasi rupture secara cepat dan akurat dengan melibatkan pencocokan kurva antara durasi rupture perhitungan dan observasi terhadap azimut stasiun seismik. Pada penelitian ini, metode inversi Levenberg-Marquardt (LM) diusulkan untuk proses penocokan kedua kurva tersebut agar diperoleh solusi arah rupture dan bidang patahan teraktifkan. Hal ini diterapkan pada katalog gempa bumi global dengan Mw > 6,4 pada tahun 2016- 2020. Jarak episentral untuk setiap gempa bumi yaitu pada rentang 30o-50o. Hasil yang diperoleh yaitu metode LM mampu mengikuti pola distribusi data durasi rupture observasi dengan baik, sehingga menghasilkan kecocokan yang baik antara data observasi dan data kalkulasi untuk setiap gempa bumi dalam menentukan arah rupture. Sekitar 78% dari 50 gempa bumi dapat diidentifikasi bidang patahan yang teraktifkan, karena salah satu sudut strike mekanisme fokal memiliki kecocokan yang baik dengan sudut arah rupture yang dihasilkan. Hasil tersebut mengindikasikan bahwa inversi menggunakan metode LM dapat diandalkan. Hasil arah rupture dan bidang patahan terkatifkan pada penelitian ini konsisten dengan hasil penelitian sebelumnya, terutama untuk gempa bumi dengan riwayat patahan sederhana.
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Rupture directivity can reduce the ambiguity of the fault plane, namely in terms of determining the actual fault plane.. The propagation of the rupture through the fault indicates the cause of the earthquake. The rupture directivity and the actual fault plane is crucial for predicting ground shaking and disaster mitigation. In this case, the rupture directivity and the actual fault plane can be estimated using the rupture duration quickly and accurately by involving curve fitting between calculated and observed rupture duration of station azimuth. In this study, the Levenberg-Marquardt (LM) inversion method is proposed for the process of matching the two curves in order to obtain a solution for rupture directivity and the plane of the activated fault. This is applied to the global earthquake catalogue with Mw > 6.4 in 2016-2020. The epicentral distance used for each earthquake is in the range of 30o-50o. The results obtained are that the LM method can follow the distribution pattern of observed rupture duration data, resulting in a good match between the observation and calculated data for each earthquake in determining rupture directivity. Approximately 78% of the 50 earthquakes can be identified as an actual fault plane because one of the focal mechanism strike angles has a good match with the resulting rupture directivity angle. These results indicate that the inversion using the LM method is reliable. The results of the rupture direction and activated fault plane in this study are consistent with the results of previous studies, particularly for earthquakes with simple rupture histories.
| Item Type: | Thesis (Masters) |
|---|---|
| Uncontrolled Keywords: | Arah rupture, bidang patahan teraktifkan, durasi rupture, inversi Levenberg-Marquardt |
| Subjects: | Q Science > QC Physics Q Science > QE Geology > QE538.8 Earthquakes. Seismology Q Science > QE Geology > QE539.2 Seismic traveltime inversion Q Science > QE Geology > QE539.2.S4 Seismic models |
| Divisions: | Faculty of Science and Data Analytics (SCIENTICS) > Physics > 45101-(S2) Master Thesis |
| Depositing User: | Muhammad Nurul Fahmi |
| Date Deposited: | 20 Aug 2021 02:08 |
| Last Modified: | 20 Aug 2021 02:08 |
| URI: | http://repository.its.ac.id/id/eprint/87815 |
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