TY  - JOUR
ID  - epos2093
UR  - http://doi.org/10.1785/0120140336
IS  - 5
A1  - Tahir, Mohammad
A1  - Grasso, Jean-Robert
Y1  - 2015///
N2  - To understand the complexity and thus to predict earthquake occurrence insize, time, and space, seismicity patterns are characterized by two robust empirical laws:the exponential distribution of magnitude and the power law decrease of aftershock rateover time. These laws are known as the Gutenberg?Richter law and the Omori law, re-spectively. Using global earthquake catalogs, we resolve that on average the K(after-shock productivity) and the p-value (exponent of the power law decrease of aftershockrate over time) are dependent on the mainshock faulting style. Strike-slip events have alower aftershock rate (N)andK-values and a larger p-value than thrust and normalevents, respectively. Within the epidemic-type aftershock sequence model, strong K,Nvalues are driven by a high-branching ratio value (n). Within the same framework, arelatively higher nvalue for the thrust events also predicts the lower p-value we observefor thrust events as compared to strike-slip and normal-faulting events, respectively.Furthermore, we observed that earthquake interactions through time and space area function of the faulting style when measured by ??t?, the exponent of the power lawdecrease of earthquake density over space. The ??t?values of thrust events for differ-ent time windows always remain smaller than those of the strike-slip events. Whenchanges in faulting styles are driven by stress pattern, the Anderson faulting theorypredicts thrust faulting that requires somewhat larger stresses, in absolute magnitude,than do normal and strike-slip faulting. Within the framework of rate-and-state frictionlaw, changes in the stress heterogeneity patterns reproduce the p-value changes weobserve. Our results suggest that only stress perturbations associated with mainshockrupture affect the productivity and decay rate over time of aftershocks
PB  - Seismological Society of America
JF  - Bulletin of the Seismological Society of America
VL  - 105
SN  - 0037-1106
TI  - Faulting Style Controls for the Space?Time Aftershock Patterns
SP  - 2480
AV  - none
EP  - 2497
ER  -