摘要
利用P波初动半周期测定介质品质因数Q值的方法,测定了澜沧(?)耿马大震前主震及其周围地区的Q值变化.根据该区域地质构造活动区域应力场分布的优势方向分析了澜沧7.6级、耿马7.2级两次大震的孕震过程,并结合对该地区划分的三个小区域Q值随时间的变化量,探讨了双主震型孕震的某些特征.
The variations of quality factor Q befor Lan Gang——Geng Ma great
earthquakes for region of main-quake and surrounding area were determined by using the method of half period of the initial motion of P wave. The pregnant processes of the two great earthquakes of Lan Cang of M7.6 and Geng Ma of M7.2 were analysed according to the superior direction of active regional stress field of geolgical structure in the area, and the several characteristics of the earthquake pregnancy for the twin main-quake type were explored by analysing the Q variations with time of the small composite regions in the area.
出处
《云南大学学报（自然科学版）》
CAS
CSCD
1990年第4期363-370,共8页
Journal of Yunnan University(Natural Sciences Edition)
关键词
地震
前兆信息
P波初动
Q值
云南
Yunnan, Lan Gang, Geng Ma, great earthquake, precursor informa-tion, initial motion of P wave, quality factor Q, pregnant process of earthquake, twin main-quake.
