摘要
安宁河断裂带是四川省西部的重要强震带。史料表明,安宁河断裂带上的强震主要集中在安宁河断裂带冕宁—西昌一段。冕宁以北没有强烈破坏性地震的记载。本文在安宁河断裂带冕宁以北地段断错地貌特征研究的基础上,根据拖乌以西野鸡洞的探槽揭露讨论了该段的古地震事件。认为该段具有发生7级地震的能力。根据探槽中^(14)C年代测定,古地震的平均重复间隔为940±150年。由于最近一次古地震的发生距今时间已接近其平均重复间隔,因而笔者认为该段已具备再次发生7级地震的能力而应予充分注意。
The Anninghe fault zone is an important seismogenic zone in West Sichuan. According to the historical record, strong earthquakes along the Anninghe fault were mainly concentrated on the segment from Mianning to Xichang, north of Mianning, there was no strong destructive earthquake. Based on the studies on the fault produced landforms along the Anninghe fault north of Mianning, according to the trench near Yejidong, west of Tuowu, we discussed the prehistorical earthquakes of this segment in this paper. We inclined to believe that this segment has the capability of generating earthquakes with magnitude 7. According to the 14C dating from the trench,the average recurrent interval of prehistorical earthquakes is 940±150 years. We also believe that another event with magnitude about 7 has been prepared on this segment because the time elapsed since the last event has agreed with the average recurrent interval,and more attention should be paid to this segment.
出处
《中国地震》
CSCD
北大核心
1990年第4期43-49,共7页
Earthquake Research in China
