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Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/nhess-2019-215
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/nhess-2019-215
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 23 Aug 2019

Submitted as: research article | 23 Aug 2019

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This discussion paper is a preprint. It is a manuscript under review for the journal Natural Hazards and Earth System Sciences (NHESS).

Correlation between the fractal of aftershock spatial distribution and active fault on Sumatra

Bahary Setyawan and Benyamin Sapiie Bahary Setyawan and Benyamin Sapiie
  • Departmentof Engineering Geology, Institut TeknologiBandung, Bandung, 40132, Indonesia

Abstract. This study discusses the correlation between the fractal of spatial epicentre distribution of aftershock (D2) and active fault (D0) in the Sumatra region. We identified 15 earthquakes in this region that were followed by aftershock cluster and related to the Sumatra Fault Zone or Southern Andaman West Fault. The spatial epicentre distribution of the aftershock was estimated by using two-point correlation integral and the D2 values found were varying from 1.03 ± 0.03 to 1.68 ± 0.08. We estimated the fractal dimension of the active fault by using Box–Counting Method and found that the variation of D0 values in the range of 0.95 ± 0.03 to 1.16 ± 0.01. Positive correlation was found in this study and two patterns were identified that had similar slope with different intercept. However, there was also a correlation that had steeper slope. The steeper slope was related to earthquake doublet mechanism that could generate more random spatial distribution of the aftershock in the fault system.

Bahary Setyawan and Benyamin Sapiie
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Bahary Setyawan and Benyamin Sapiie
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Short summary
This study more discusses the fractal of aftershock characteristics in spatial distribution and fault dimension. The recent study didn't consider that the earthquake mechanism could affect the aftershock distribution. To conclude, we found scale invariance in the relationship between fault and aftershock spatial distribution. It also was controlled by the mechanism of earthquakes, either it was a regular or doublet earthquake.
This study more discusses the fractal of aftershock characteristics in spatial distribution and...
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