鲁苏皖交界地区地震活动特点浅析

ANALYSIS ON THE FEATURE OF SEISMICITY IN THE JOINT AREA OF SHANDONG,ANHUI,AND HENAN PROVINCE

摘要: 从历史及现代两个时期对三省(鲁苏皖)交界区域地震活动特点、规律进行了讨论和分析。从历史活动周期及小震空区空间演化特征,以不同的角度讨论分析研究了所属区域的震情发展趋势。指出近期(1998年起)形成的空区为孕震空区,且空区周围应力场背景显示增强的态势,并依据历史地震南北迁移特点,认为34°N以南区域为未来发生5级以上地震的地区,应注意加强监视。

Abstract: the characteristics of the seismicity in history and recent years in the joint area of Shandong, Anhui and Henan Province are analyzed.Based on the historical active cycle and the evolution of seismicity gap in space, the tendency of earthquake in the region is studied.The results show that the seismicity gap formed recently(started from 1998), which the stress field is strengthening in its vicinity, may be a seismogenic gap.From the view of earthquake migration between south and north, we concluded that the area of South 34°N is an risk region of M5.0 earthquake.