摘要
本文收集了国内各个单位和国外EDR报告给出的澜沧——耿马地震的震源参数和震源机制解参数,讨论了它们之间差别的原因。由地震定标律给出了主震7.5级地震的断层长度、宽度、面积和平均错距的估计值,结果分别为52 km,26 km,1.3×10~3 km^2,2.0 m。研究了它们的破裂方向:像是从中间地区分别向东南(产生最大主震7.5级地震)和西北方向(产生次大主震7.0级地震)破裂扩展,但不是同时,相隔了约13分钟。本文还讨论了第二次主震(Ms7.0)比第一次主震(Ms7.5)造成的地面破坏面积大的原因。
The source parameters and focal mechanism solution parameters of Lancang-Gengma earthquake, published in various internal journals and external EDR reports, have been gathered in this paper, and reasons that made difference between them have been discussed. Based on the law of earthquake definite ;tandard, the fault length, width, area and average offset of the M 7.5 mainshock are estimated, resulting 52 km, 26 km, 1.3×103 km2 and 2.0 m, respectively. An analysis is made on the rupture direction, which starts in the mid area propagating Eoutheastward (generating the largest M 7.5 mainshock ) and northwestward (generating the second large M 7.0 event) , respectively, with a time interval of about 13 minutes. Reasons that caused larger ground failure area by the second M7.0 event than that by the largest M 7.5 mainshock are also discussed.
出处
《地震研究》
CSCD
北大核心
1991年第2期95-103,共9页
Journal of Seismological Research
关键词
地震
破裂
震源
断层
澜沧-耿马
Source parameter
Focal mechanism solution parameter
Ruplure direeltion
Lancang-Gengma Earthquake
