Study of Seismic Spatial-temporal Evolution Characteristic in Hebei and Its Adjacent Area
GONG Meng
GUO Lei
ZHANG Su-xin
WANG Xiao-shan
DONG Bo
Abstract：We analyze the seismic spatial‐temporal evolution characteristic in Hebei and adjacent area by u‐sing the earthquakes catalog from January 1970 to November 2015 recorded by The China earthquake net‐works center .The result shown that prior the 1976 Tangshan earthquake the Zhangjiakou‐Bohai‐Weihai earthquake zones appeared 1-2 year’s sparse distribution of small earthquake and it preparation area had experienced a seismic gap lasted for 2 -3 years .In Zhangjiakou‐Bohai‐Weihaiearthquake zone ,the earth‐quake of magnitude greater than 4 spatial‐temporal distribution map show a “dense‐sparse‐expansion” dis‐tribution and piecewise seismically active features .The small earthquakes distribution do not show any ab‐normal feature in this earthquake zonesafter 1999 Zhangbei M5 .6 earthquake .The small earthquakes ap‐peared“dense‐spare” abnormal distribution phenomenon before the moderately strong earthquakes hap‐pened in Xingtai earthquake zone .Noteworthiness ,in Hebei basin the small earthquakes occurred in Xing‐tai earthquake zone appeared a sparse distribution abnormal since 2014 year .
Keywords：small earthquakes activityseismic densityspatial and temporal distribution
Publication Date：2016-01-01
Pages：5( 11-15 )