Fractal Dimension Analysis and Earthquake Repeated Period Estimation in the Southern Part of Sumatra Subduction Zone (Bengkulu-Lampung-Sunda Segment)
Vol. 9 No. 3 (2022), Articles
Vol. 9 No. 3 (2022)

Fractal Dimension Analysis and Earthquake Repeated Period Estimation in the Southern Part of Sumatra Subduction Zone (Bengkulu-Lampung-Sunda Segment)

Articles
https://doi.org/10.17014/ijog.9.3.383-394
Published 24-10-2022
Syamsurijal Rasimeng
Department of Geophysic Engineering, Faculty of Engineering, University of Lampung,
Masdar Helmi
Department of Civil Engineering, Faculty of Engineering, University of Lampung,
Tugiyono Tugiyono
Department of Geophysic Engineering, Faculty of Engineering, University of Lampung,
Suharno Suharno
Post Graduate Programme of Environmental Sciences, University of Lampung,
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Keywords

magnitude moment
a -value
b-value
seismicity
hypocentre

How to Cite

Rasimeng, S., Helmi, M., Tugiyono, T., & Suharno, S. (2022). Fractal Dimension Analysis and Earthquake Repeated Period Estimation in the Southern Part of Sumatra Subduction Zone (Bengkulu-Lampung-Sunda Segment). Indonesian Journal on Geoscience, 9(3), 383–394. https://doi.org/10.17014/ijog.9.3.383-394
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Abstract

DOI:10.17014/ijog.9.3.383-394

An earthquake seismicity parameter study has been conducted in the southern part of the Sumatra Subduction Zone (SSZ) for the period of 1919 to 2019 with a hypocentre depth of 120 km and magnitude of ≥4Mw. The researched area is divided into three segments, Bengkulu, Lampung, and Sunda segments, 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 was used to calculate the seismicity parameters based on catalogue data obtained from USGS. An a-value variation of 5.11±1.84 to 5.85±2.46 obtained indicates the most dominant seismic intensity. b-value of 0.69±0,.17 to 0.83±0.35 correlates 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 1.4±0.33 to 1.7±0.71 indicates an earthquake distribution pattern was caused by a single fracture zone along the southern part of SSZ. The fracture zone is located on the left and right sides of the southern part of SSZ, which may not have been connected. In addition, the calculation result of earthquake recurrence period with magnitude ≥6.5Mw indicates that there will be an 5 - 6 earthquake event in the Bengkulu segment, 2 - 3 event in the Lampung segment, and 1 - 2 event in the Sunda segment, while the probabilities of an earthquake with magnitude ≥7.5Mw along the southern part of SSZ is 1 - 2 times.

https://doi.org/10.17014/ijog.9.3.383-394
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