Basin and crustal velocity structure models for the simulation of strong ground motions in the Kinki area, Japan

• Published in: Journal of seismology 2008-04, Vol.12 (2), p.223-234
• Main Authors: Iwata, Tomotaka, Kagawa, Takao, Petukhin, Anatoly, Ohnishi, Yoshihiro
• Format: Article
• Language: English
• Subjects: Earth and Environmental Science; Earth Sciences; Earthquakes; Geophysics/Geodesy; Geotechnical Engineering & Applied Earth Sciences; Ground motion; Hydrogeology; Original Article; Plate tectonics; Seismic activity; Seismology; Simulation; Structural Geology; Velocity
• ISSN: 1383-4649; 1573-157X
• DOI: 10.1007/s10950-007-9086-7

We constructed a prototype of the basin and crustal structure model for the Kinki area, southwest of Japan, for the simulation of strong ground motions of hypothetical crustal and subduction earthquakes. We collected results of the deep seismic velocity profiles obtained by the reflection experiments and seismic imaging results, which were conducted in the Kinki area. The obtained profiles give underground velocity structures of the crust, from the surface to the subducting slab. We also gather the basin velocity structure information of the Osaka, Kyoto, Nara, and Ohmi basins. To examine the applicability of the constructed velocity structure model to the ground motion simulation, we simulated waveforms of an intermediate size event occurred near the source area of the hypothetical subduction earthquakes. Simulated ground motions using the basin and crustal velocity structure model are fairly well reproducing the observations at most of stations, and the constructed basin and crustal velocity structure model is applicable for the long-period ground motion simulations.