HR: 0800h
AN: S41A-0976    [Abstracts]
TI: Discussion on Primary Application of the Crustal Deformation Data in Seismic Zonation
AU: * Bengang, Z
EM: zzhoubg@sina.com
AB: Abstract We collected the available data from 1996 to 2001 of 40 GPS sites in middle Fenwei seismic zone. By processing the GPS data, the relative horizontal velocity of each site was achieved, and then the principal strain rates for three selected crustal deforming units was calculated in this paper. We analyzed the seismic activity trend in 100 years in middle Fenwei seismic zone and evaluated the earthquake recurrence intervals of two potential earthquake sources by adopting the method of assessing seismic moment accumulation rates using the strain rates of deforming units. The rate of seismic moment accumulation in middle Fenwei seismic zone is mach larger than the average seismic moment release rate. This result indicates the seismic activity in middle Fenwei seismic zone will increase in 100 years. The earthquake recurrence intervals of Dingxiang and Hozhou potential earthquake sources deduced by strain rates are close to those by geological methods. Therefore, as long as the GPS data is sufficient enough, this method is applicable to analyzed the long-time seismic activity trend in a seismic zone, and evaluate the recurrence interval of large earthquakes in potential earthquake sources, especially for those potential earthquake sources which geological data are not available.
DE: 7212 Earthquake ground motions and engineering seismology
SC: Seismology [S]
MN: Fall Meeting 2005