Faulting Style and b-Value: A Global Perspective
The b-value in the frequency-magnitude relation provides significant information to understand seismicity, seismotectonics, and seismic hazard analysis. In this study, we investigated the relation between the b-value and faulting style on a global scale. The used data were extracted from the Global Centroid Moment Tensor (GCMT) catalog. The least square fit and maximum likelihood methods were used to calculate the b-value. The obtained results show that thrust, strike-slip and normal-faulting earthquakes, occur in regions of low, intermediate, and high b-values, respectively. Our results are in good agreement with the previous works, and we found that the study scale does not affect the hypothesis of a general relationship between faulting style and the b-values (bnormal > bstrike-slip > breverse).
Keywordsb-constant Normal fault Reverse fault Strike-slip Maximum likelihood
- 1.Gutenberg, B., Richter, C.: Frequency of earthquakes in California. Bull. Seismol. Soc. Am. 34, 185–188 (1944)Google Scholar
- 2.Mogi, K.: Magnitude-frequency relation for elastic shocks accompanying fractures of various materials and some related problems in earthquakes. Bull. Earthq. Res. Inst. Univ. Tokyo 40, 831–853 (1962)Google Scholar
- 3.Scholz, C.: The frequency—magnitude relation of microfracturing in rock and its relation to earthquakes. Bull. Seismol. Soc. Am. 58, 339–415 (1968)Google Scholar
- 10.Aki, K.: Maximum likelihood estimate of b in the formula logN = a−bM and its confidence. Bull. Seismol. Soc. Am. 43, 237–239 (1965)Google Scholar