Distribution of Hypocenters and Focal Mechanisms in and around the Hidaka Arc-Arc Collision Zone Revealed by a Dense Temporary Seismic Network

A group of seismologists from eleven universities operated a dense temporary seismic network from July 1999 to July 2001 in and around the Hidaka Collision Zone, Hokkaido, Japan, where the Kurile Island arc and the northeastern Japan arc meet and collide. All waveform data were telemetered by way of a communication satellite and recorded continuously. We obtained seven thousand well-located hypocenters and 351 focal mechanisms. This research forms a part of ""The new Program of the Study and Observation for Earthquake Prediction"" in Japan started after the Hyogoken-nanbu (Kobe) earthquake in 1995