Hasan, Muhammad Mifta (2016) Estimasi Mekanisme Sumber Gempa Low Frequency Menggunakan Waveform Inversion Pada Gunungapi Papandayan. Masters thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Gempa Low Frequency (LF) telah terekam pada Gunungapi Papandayan
dalam rentang waktu Bulan September 2015 dengan frekuensi maksimum kurang
dari 5 Hz. Distribusi episenter dari LF tersebar di Kawah Mas dan Kawah
Nangklak dengan kedalaman terbagi kedalam dua kelompok, yaitu 0.7 sampai 2
km dan 5 sampai 6 km. Momen tensor dari Gempa LF didapatkan dari inversi
waveform dengan melihat korelasi waveform data dengan waveform sintetik
dengan beberapa aspek yaitu, korelasi terhadap kedalaman centroid, time shift,
presentase DC dan fitting waveform. Dari keenam gempa yang dianalisa, dua
gempa mempunyai presentase DC yang lebih dominan 63% dan 66% dengan
solusi bidang patahannya adalah strike-slip dan oblique-reverse. Dan untuk gempa
yang lain, mempunyai presentase non-DC yang lebih dominan 55% sampai 85%
dengan solusi bidang patahannya strike-slip, normal, reverse dan dip-slip. Gempa
LF berasosiasi dengan sistem hidrotermal dengan mekanisme sumber diakibatkan
oleh rekahan pada dinding-dinding resevoir hidrotermal karena adanya tekanan
dan pengisian fluida pada rekahan tersebut secara cepat. Selain itu, pada bagian
pipa konduit, membentuk rekahan sub-vertikal dari pipa yang terisi fluida
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Low Frequency (LF) events has been recorded on Papandayan Volcano in
September 2015 with a maximum frequency of less than 5 Hz. The distribution of
epicenters of LF beneath Mas crater and Nangklak crater with depth divided into
two groups, 0.7 to 2 km and 5 to 6 km. Moment tensor of LF event obtained from
waveform inversion by using waveform correlation with synthetic waveform and
other aspects, specifically, correlation of the centroid depth, time shift, the
percentage of DC and fittings waveform. From six events were analyzed, two
events have dominant DC percentage 63% and 66% with a faultplane solution are
strike-slip and oblique-reverse , And for another events, the percentage of non-DC
has a dominant 55% to 85% with the faultplane solution are strike-slip faults,
normal, reverse and dip-slip. LF event associated with the hydrothermal system
and the source mechanism generated by fractures in the walls of the hydrothermal
reservoir with the pressure of fluid-filled in fracture rapidly. In pipe conduit,
forming cracks in sub-vertical of the pipe also generate LF event.
| Item Type: | Thesis (Masters) |
|---|---|
| Additional Information: | RTFi 557.3 Has e |
| Uncontrolled Keywords: | Low-frequency, Non-Double Couple, Sistem hidrotermal, Gunungapi Papandayan |
| Subjects: | Q Science > QE Geology > QE539.2.S4 Seismic models |
| Divisions: | Faculty of Science and Data Analytics (SCIENTICS) > Physics > 45101-(S2) Master Thesis |
| Depositing User: | Mr. Tondo Indra Nyata |
| Date Deposited: | 16 Mar 2020 03:40 |
| Last Modified: | 16 Mar 2020 03:40 |
| URI: | http://repository.its.ac.id/id/eprint/75488 |
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