摘要
台湾省是我国著名的强震区之一,特别是位于多个板块交汇、碰撞的东部地区,强震的复发周期之短,居全国之首。通过对1986年11月15日花莲7.6级地震的初步分析,认为该地震类型介于主震型与震群型之间,大震前存在前兆震群活动以及两种地震空区并存的特征;进一步对比我国大陆九次大震,可见花莲7.6级地震a值和b值较接近西南地区强震,而地震衰减系数P值介于东部和西南地区强震之间。由地震波分析推测这次地震可能是由于震源的两次错动引起的。
Taiwan province is one of the well-known highly seismic regions in China, especially its eastern part where plates converge and collision occurs so that the recurrence interval of strong shocks is the shortest in China. Preliminary analysis of the Hualian M7.6 earthquake sequence on November 5th, 1986 shows that the type of this event lies between major-earthquake type and earthquake-swarm type. Before the main shock, there existed precursory swarm activities and two kinds of seismic gaps. By comparing with 9 large shocks in China mainland, it can be seen that a and b-values of the Hualian M7.6 earthquake are relatively similar to those strong shocks in Southwest China, and the attenuation coefficient, f, lies between those in eastern and western China mainland. Through seismic wave analysis it is inferred that the Hualian quake was probably caused by double offsets in the seismic source.
出处
《地震》
CSCD
北大核心
1990年第2期41-49,共9页
Earthquake
