Abstract
The 2014 northern part of Nagano prefecture earthquake of Mj6.7 revealed earthquake fault on the surface along the Kamishiro fault. Strong ground motions were generated near source area and caused severe damage to many houses. Authors performed damage investigation around source area in the aftermath of the earthquake. We confirmed a trace of the earthquake damage due to strong ground motion and ground displacement. We constructed a preliminary source model by the empirical Green's function method. The source parameters for strong motion generation area located on the fault plane were determined from the comparisons of the synthesized broad-band ground motions with the observed ones at several stations including near source. Resultantly, we proposed source model with one strong motion generation area located at near hypocenter. The relationship between seismic moment and short period level of acceleration source spectrum of this earthquake are expressed in a scaling law of the past study.
