The manner which decides earthquake data travel time field on the super parallel computer

摘要

PCT No. PCT/US96/12261 Sec. 371 Date Jan. 20, 1998 Sec. 102(e) Date Jan. 20, 1998 PCT Filed Jul. 25, 1996 PCT Pub. No. WO97/05558 PCT Pub. Date Feb. 13, 1997A method of determining traveltime fields for use in processing geophysical data. The method is implemented on a computer having massively parallel processors. The input to the method is a three-dimensional velocity model of a volume of the subsurface of the earth. The method assigns the traveltime calculations to groups of processors, which calculate traveltimes for individual shots. A preliminary simulation of the traveltime calculation process is performed to determine the number of processors required in each group. The groups of processors perform the traveltime calculations independent of the other groups. Calculations are performed in spherical coordinates, with traveltimes interpolated to a rectangular grid for storage and subsequent use. The final traveltimes are compressed in a differential format to reduce data storage and transfer requirements. A control processor is used to dynamically assign calculation tasks to processor groups, thereby ensuring load balance across all groups and maximizing throughput of the massively parallel processors.