EARTHQUAKE HYPOCENTER RELOCATION ANALYSIS IN THE MAMBERAMO FAULT AREA, PAPUA, INDONESIA AND SURROUNDING USING THE DOUBLE DIFFERENCE METHOD
The Mamberamo Fault Zone which is located in the North Papua basin has a tectonic setting that was formed due to the subduction of the Australian plate under the Pacific plate and the Halmahera plate. Mechanistically, the Mamberamo Fault Zone is a fault system thrust belt, this condition causes a...
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| 主要作者: | |
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| 格式: | Final Project |
| 語言: | Indonesia |
| 在線閱讀: | https://digilib.itb.ac.id/gdl/view/77276 |
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| 機構: | Institut Teknologi Bandung |
| 語言: | Indonesia |
| 總結: | The Mamberamo Fault Zone which is located in the North Papua basin has a
tectonic setting that was formed due to the subduction of the Australian plate under
the Pacific plate and the Halmahera plate. Mechanistically, the Mamberamo Fault
Zone is a fault system thrust belt, this condition causes a relatively high level of
seismicity at shallow depths in northern Papua. The distribution of earthquake
hypocenters can be used as a reference to understand the potential hazard and risk
of an earthquake. However, the initial results of the hypocenter have a high degree
of uncertainty especially at the focal depth of the earthquake, causing low accuracy
in determining the earthquake hypocenter in the Mamberamo area. Hypocenter
relocation can be used to increase the accuracy of earthquake hypocenters. This
study aims to relocate the hypocenter of the earthquake in the Mamberamo Fault
area, using P and S wave arrival time data from the BMKG earthquake catalog for
the period 1 January 2018 – 31 June 2022. The relocation method used in this study
is the Double Difference by using software hypoDD. Data events which are used
amount to 2348 events, using the updated AK135-F speed model using software
Velest 3.1, then relocation was carried out and the results of relocation were 1575
events. The distribution of relocation results shows changes in the hypocenter at
relatively shallow depths with distribution events focused on 5 segments of
Mamberamo Fault Zone.Land earthquake activity is seen to be significant in the
southern part of segment Makai and Tuira while earthquakes in the water area are
more common in the northern part of segment Toarim, Mawe and Djanggur. The
slope pattern in segment Makai and Toarim are identified in the vertical sections
A-A' and D-D'. The relocation results obtained can improve the accuracy of the
hypocenter location, the geometry model of the Mamberamo Fault Zone and also
the potential risk of earthquakes that could occur in the future. |
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