Speaker
Description
P-wave arrival time data, collected from 150 local earthquakes recorded at 10 telemetered stations located around Abu Dabbab area, has been relocated by three-dimensional velocity model using Simul3 software. Three-dimensional velocity model for earthquake location were computed by inverting the high quality data in the periods from June to August 2004, for hypocenter locations and P-wave seismic velocities. Hypocenters depths ranged from approximately 6 to 12 Km. The present analysis revealed the lateral heterogeneities in the structure of the crust beneath Abu Dabbab area. It was found that the crustal velocity structure at first 1 Km depth is dominated by high velocity zone at the center of the eastern part of the study area and extended down to 12 Km, and low velocity zone appears at the west of the high velocity zone extended down to 12 Km tending to southeast direction. No large systematic shifts of the relocated earthquake locations were observed, except a systematic shift of about 5 km to greater depth. In conclusion, the new relocated earthquake locations showed tighter clustering of epicenters and focal depths when compared with original earthquake locations.
