Olami-Feder-Christensen モデルによる浅発地震の再現へ向けて

Abstract

Incorporating possible mechanisms in actual faults into the Olami-Feder-Christensen earthquake model (OFC model), we verified the results from the viewpoint of self-organizing critical phenomena. In the model considering size, shape and static heterogeneity of the fault, the power law of the power index -1.2 is found for the energy (or scale) and the number of occurrences of the "earthquake", indicating that these results was not inherently affected by the parameter. However, considering attenuation and dynamic inhomogeneity, the absolute value of the exponent became large, but the power law was still observed. These results suggest that earthquakes based on the OFC model essentially represent self-organized critical phenomena. There were some cases where the statistical distribution of the temporal change of the earthquake energy could be approximated by the q-Gaussian distribution. Further research is required to clarify the criticality of the earthquakes in OFC model.