Characteristics of the Recent Seismicity in the Tangshan Old Seismic Region
To analyze the seismic background in the Tangshan old seismic region and provide earthquake trend predic-tions,we describe the characteristics of the recent seismicity in this region.Results show that the recent seismicity in the Tangshan old seismic region is different from the early aftershock intensive area of the 1976 Tangshan MS7.8 earthquake.Considering the statistical results of regional background seismicity,the influence of the Tangshan earthquake is gradual weakening,and the recent seismicity in the Tangshan old seismic region can be considered as background seismicity.The characteristics of seismicity are different in the three sub-areas of the Tangshan old seismic region,the earthquakes mainly concentrate in the central area,followed by the eastern area,and the western area was the weakest,and the moderate earthquake following a law of alternate occurrence in the east,central and west sub-areas.This seismic migration law constitutes a reference for the determination of the locations of future moderate-to-strong earthquakes.At present,the accumulation of tectonic stress is accelerating in the old seismic region of Tangshan.Seismicity changing from quiet to active is possible,and moderate-to-strong earthquakes may occur at the northern segment of the Tangshan Fault and the intersection of the Luanxian-Laoting Fault and the Lulong Fault in the future.
the 1976 Tangshan MS7.8 earthquakecharacteristics of seismicitybackground seismicityseismic migration law
万方数据
维普
