The statistical analysis of the earthquakes occuring in a model consisting of a set of faults with a frictional stick slip mechanism subjected to a shear stress field is studied and compared with the case when the stress field is purely compressional. It is found that the density distribution of stress drops of the earthquakes p is close to p-3 in both cases; while in the observed regional seismicity the distribution is p-α(1<α<2)(Caputo, 1981). If the density distribution of the direction of faults is isotropic it follows that the frictional stick slip model does not occur too frequently in nature, at least in the case of the small stress drops, and that the barrier breaking mechanism is perhaps more frequent. It is found that in the case of a shear stress field the density distribution no(Mo)(Mo is the seismic moment) is in accordance with the law log no= ao - bOlog Mo, where bo allows an estimate of the density distribution of fault sizes (Caputo, 1976, 1977). It is also found that,...
Frequency of occurrence of earthquakes with stick-slip mechanism and regional displacement
CAPUTO, Riccardo
1988
Abstract
The statistical analysis of the earthquakes occuring in a model consisting of a set of faults with a frictional stick slip mechanism subjected to a shear stress field is studied and compared with the case when the stress field is purely compressional. It is found that the density distribution of stress drops of the earthquakes p is close to p-3 in both cases; while in the observed regional seismicity the distribution is p-α(1<α<2)(Caputo, 1981). If the density distribution of the direction of faults is isotropic it follows that the frictional stick slip model does not occur too frequently in nature, at least in the case of the small stress drops, and that the barrier breaking mechanism is perhaps more frequent. It is found that in the case of a shear stress field the density distribution no(Mo)(Mo is the seismic moment) is in accordance with the law log no= ao - bOlog Mo, where bo allows an estimate of the density distribution of fault sizes (Caputo, 1976, 1977). It is also found that,...I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
