摘要
本文应用模糊数学中从属函数的概念,引进地震活动模糊集中度μ_c和模糊集中-增强度μ_T这两个定量指标,用来研究地震活动高潮期出现之前中等地震活动的空间分布特性(集中程度)和时空分布特性(增强-集中程度)。作为实例,文中详细分析了华北地区前两次地震活动高潮期中第一次大震即1966年邢台7.2级地震和1937年菏泽7.0级地震发生前中等地震活动的时空分布特点。所得结果表明,邢台地震和菏泽地震都发生在华北地区地震活动模糊集中度μ_c最高的区域,并且在地震发生前10年左右及前1至5年该区域的模糊集中-增强度μ_T值两次超过0.5的高值。文章最后用μ_c和μ_T对近期华北地震形势作了估计。
The subordinate function concept of fuzzy mathematics and two quantitative indexes of the fuzzy concentration μT and fuzzy concentration-strengtthening μT are used to research the spatial distribution feature (concentration) and time-space distribution characteristics (strengthening concentration) of moderate earthquakes before a seismic all active episode in this paper. As an example, we studied the time-space distribution characters of moderate seismic activities before the occurrences of the first large earthquakes, namely the 1966 Xingtai Ms 7.2 and the 1937 Heze Ms7.0 earthquakes in the two previous seismic ally-active episodes in North China. The results obtained show that both earthquakes occurred in the highest area of seismicity fuzzy concentration μc in North China, and about 10 years and 1-5 years before the earthquake occurrence, the fuzzy concentration-strengthening uc value was 0.5 over the highest value for two times. Finally, the recent seismic situation in North China is estimated here using uc and uT.
出处
《地震》
CSCD
北大核心
1989年第1期50-56,共7页
Earthquake
