摘要
1988年11月6日滇西南发生了澜沧7.6级、耿马7.2级强烈地震,两震相距70公里。本文分析了大震活动的条带与空区特征。这两次地震之前既有M≥4.5地震活动条带,又有M≥3.5地震空区,条带与空区相连接。空区是震前三年多开始出现,震前半年消失的;条带是前一年多时间内形成的,条带的迅速形成深入到空区之内,促使了空区的消失。澜沧7.6级地震发生在两个条带的交汇部位,也是条带的端部、空区的边缘;耿马7.2级地震则发生在空区之内。
On Nov. 6, 1988, the M 7.6 Lancang earthquake and M 7.2 Gengma earthquake occurred in Southwest Yunnan, which were 70 km apart. The belt and gap characteristic of seismic activity before those large earthquakes has been analysed in this paper. There exist not only belts of M≥4.5 events but also a gap of M≥3.5 events before the two earthquakes, and the belts and gap were connected with each other. The gap appeared three and more years and disappeared half a year before the earthquakes; whereas (he belts were formed one and more years before the earthquakes. And the belts were rapidly developed in the gap, which made the gap disappeared. The M 7.6 Lancang earthquake took place at the joint area of two belts where belts ended and the gap boundary stood; but the M 7.2 Gengma earthquake took place within the gap.
出处
《地震研究》
CSCD
北大核心
1991年第2期122-126,共5页
Journal of Seismological Research
关键词
地震
活动条带
空区
澜沧-耿马
Belt of seismic activity
Seismic gap
D value
Laneang-Gengma earthquake
