Rasimeng, Syamsurijal and Helmi, Masdar and Tugiyono, Tugiyono and Suharno, Suharno (2020) FRACTAL DIMENSION ANALYSIS AND EARTHQUAKE REPEATED PERIOD ESTIMATION IN SUMATERA FAULT ZONE CASE: BENGKULU-LAMPUNG-SUNDA SEGMENT (Awaiting for Publish at Q4 Scopus index). Indonesian Journal on Geoscience, xxx (xxxx). xxxx-xxxx. ISSN 2355-9314 (Submitted)

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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 4.44 to 5.63 is obtained, which indicates the most dominant seismic intensity. b-value of 0.66 to 0.80 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 moment (Mw) ≥6.5 indicate that an earthquake will occur for a hundred years period is more than 5 event in the Bengkulu segment, 3 event in the Lampung segment and 2 event in the Sunda segment, while the probabilities of an earthquake with magnitude moment ≥7.5 along the southern SFZ is more than 2 times.

Item Type: Article
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TD Environmental technology. Sanitary engineering
Divisions: Fakultas Teknik (FT) > Prodi Teknik Geofisika
Depositing User: SYAMSURIJAL RASIMENG
Date Deposited: 08 Jun 2020 05:35
Last Modified: 08 Jun 2020 05:35
URI: http://repository.lppm.unila.ac.id/id/eprint/22071

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