Syamsurijal, Rasimeng and Suharno, Suharno and Tugiyono, Tugiyono and Masdar, Helmi (2019) FRACTAL DIMENSION ANALYSIS AND EARTHQUAKE REPEATED PERIOD ESTIMATION IN SUMATERA FAULT ZONE (BENGKULU-LAMPUNG-SUNDA SEGMENT). In: Coordinating Science, Technology and Culture for Sustainable and Resilient Future, 17 Oktober 2019, Bengkulu.

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Abstract

An earthquake seismicity parameter study has been conducted in the southern part of the Sumatra Fault Zone (SFZ) for the period 1919 to 2019 with a hypocenter depth of 120 km and magnitude ≥ Mw 4. The research area is divided into three segments, Bengkulu segment, Lampung segment and Sunda segment, respectively. This study aims to evaluate the seismicity parameters in the form of a-value, b-value, fractal dimension and probabilities of earthquake recurrence period. Frequency-magnitude correlation statistical approach introduced by Gutenberg-Richter is used to calculate of seismicity parameters based on catalogue data obtained from USGS. An a-value variation of 4.4358 to 5.6263 is obtained, which indicates the most dominant seismic intensity. b-value of 0.6576 to 0.7978 correlate with high-stress levels, the level of spatial heterogeneity on the SFZ and the probabilities of bigger earthquakes in the future. The calculation of fractal dimension of 1.3 to 1.6 indicates an earthquake distribution pattern caused by a single fracture zone along the SFZ. The fracture zone is located on the left and right of the SFZ, which may not have been connected. In addition, the calculation result of earthquake recurrence period with magnitude ≥ Mw 6.5 indicates that there will be an 5-6 earthquake event per year in the Bengkulu segment, 2-3 event per year in the Lampung segment and 1-2 event per year in the Sunda segment, while the probabilities of an earthquake with magnitude ≥ Mw 7.5 along the southern SFZ is 1-2 times per year.

Item Type: Conference or Workshop Item (Paper)
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Divisions: Fakultas Teknik (FT) > Prodi Teknik Geofisika
Depositing User: SYAMSURIJAL RASIMENG
Date Deposited: 04 Nov 2019 08:26
Last Modified: 04 Nov 2019 08:26
URI: http://repository.lppm.unila.ac.id/id/eprint/14872

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