近畿北部の中規模地震と Strain Step について

抄録

Observational results of far-field residual strains caused by large earthquakes and of permanent deformations in the vicinity of faults associated with destructive earthquakes can be explained well by mathematical models of faulting based on the dislocation theory. But with regard to moderate or small earthquakes, such remarkable phenomena with seismic faulting have not been observed except for a few earthquakes in the California-Nevada region.
Now, strain steps associated with earthquakes ranging in magnitude 3.2 to 5.6 in the northern part of Kinki district have been observed at Iwakura, Amagase and Donzurubo observatories using super-invar-bar extensometers.
The purpose of this paper is to examine whether these strain steps also can be explained by mathematical models based on the dislocation theory.
At the first step, we compared these observed values with the strain field calculated by F. PRESS in 1965.