Improving location parameters for earthquakes in romania using joint hypocenter determination method (jhd)

ANTELOPE revised locations, extracted from the INCDFP catalogue, were used as input data for relocation with JHD method. The basic idea behind this technique is to simultaneously determine an optimum 1-D structural model for the target area, to relocate the events and to fix a common set of station corrections. Under appropriate conditions, the station corrections reproduce the unmodelled velocity variations, and thus can significantly improve the location of events. These corrections are related to local effects characterizing the station site. The relocated earthquakes and quarry blasts using JHD better delimit specific clusters in comparison with routine catalog locations.