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Extending the method of Joint Hypocenter Determination, we devised a new method to determine hypocenters, station corrections and a seismic velocity in the source region of shallow earthquakes simultaneously. Travel times of initial P waves of earthquakes occurring in a small area are analysed in this method. We have applied this method to subcrustal earthquakes with depths of 20-40 km in several small regions in the Tokai district, and P velocities of 6.8+0.3km/s were obtained. Since this value is quite similar to that in the main layer of the oceanic crust, we can conclude that these subcrustal earthquakes in the Tokai district occur within the subducted oceanic lower crust of the Philippine Sea plate.

Simultaneous Determination of Hypocenters and P Velocities in Source Regions of Subcrustal Earthquakes in the Tokai District, Central Japan