Journal
EARTH PLANETS AND SPACE
Volume 66, Issue -, Pages -Publisher
SPRINGER HEIDELBERG
DOI: 10.1186/1880-5981-66-8
Keywords
Seismicity; Frequency-magnitude distribution; Fractal dimension; Mainland Southeast Asia
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Funding
- Ratchadapiseksomphot Endowment Fund of Chulalongkorn University [RES560530028CC]
- Thailand Research Fund (TRF) Grant for New Researchers
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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 (R-2 = 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.
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