Abstract
The 2004 Sumatra and 2011 Tohoku earthquakes highlighted the need for a more accurate understanding of earthquake characteristics in both regions. In this study, both the a and b values of the frequency-magnitude distribution (FMD) and the fractal dimension (D C ) were investigated simultaneously from 13 seismic source zones recognized in mainland Southeast Asia (MLSEA). By using the completeness earthquake dataset, the calculated values of b and D C were found to imply variations in seismotectonic stress. The relationships of D C -b and D C -(a/b) were investigated to categorize the level of earthquake hazards of individual seismic source zones, where the calibration curves illustrate a negative correlation between the D C and b values (D c = 2.80 - 1.22b) and a positive correlation between the D C and a/b ratios (D c = 0.27(a/b) - 0.01) with similar regression coefficients (R2 = 0.65 to 0.68) for both regressions. According to the obtained relationships, the Hsenwi-Nanting and Red River fault zones revealed low-stress accumulations. Conversely, the Sumatra-Andaman interplate and intraslab, the Andaman Basin, and the Sumatra fault zone were defined as high-tectonic stress regions that may pose risks of generating large earthquakes in the future.
Highlights
Various statistical techniques assessing the seismicity, frequency-magnitude distribution (FMD; Gutenberg and Richter 1944), and fractal dimension (DC) (Wyss et al 2004) are regarded as effective approaches used to understand the local seismotectonic activities
Frequency-magnitude distribution According to Gutenberg and Richter (1944), the FMD power law can be expressed as Fractal dimension (DC) In this study, the DC value was evaluated according to the correlation integral technique
The a value indicates the entire seismicity level, and the b value relates to tectonic stress (Mogi 1967; Scholz 1968)
Summary
Various statistical techniques assessing the seismicity, frequency-magnitude distribution (FMD; Gutenberg and Richter 1944), and fractal dimension (DC) (Wyss et al 2004) are regarded as effective approaches used to understand the local seismotectonic activities Both the b value of the FMD and the DC value are significantly related to, and directly controlled by, the seismicity and tectonic stress levels in that region (Scholz 1968; Öncel et al 1996). After the devastation caused by the Mw-9.0 earthquake on December 26, 2004, the mainland Southeast Asia (MLSEA; Figure 1) has been recognized as one of the most seismically active regions in the world Both interplate and a number of intraplate regimes are defined as hazardous earthquake sources.
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