摘要
分析了云南地区第四强震跃期内波速比的变化规律,探讨了强震孕育过程与波速变化、震源深度变化、中小地震活动的关系,结果表明:波速比异常、震源深度变化异常与3、4级中小地震活动的异常,最早出现于云南7级地震前4年左右,大多数异常集中出现于震前2年左右,表现为波速比、震源深度异常增多,震前1年左右异常则逐步减少;伴随着云南第四强震活跃期的开始—结束的过程,云南地区的波速比也经历了下降—恢复的准同步过程。
We study the variation regularity of wave-velocity ratio in the 4th active period of strong earthquakes inYunnan,and discuss the relation between strong earthquake genesis and variation of wave velocity,medium-small earthquakes,and variation of focal depth.The result shows that wave-velocity ratio,focal depth and anomaly of M3-4.9 earthquakes appeared as early as 4 years before the M≥7.0 earthquakes.Most of them appeared about 2 years before the strong earthquakes,and anomaly of wave-velocity ratio and focal depth increased and gradually reduced about one year before the strong earthquakes.Corresponding to the beginning and the ending of the 4th active period.Wave-velocity ratio in Yunnan experienced the quasi-synchronous declining and rising.
出处
《地震研究》
CSCD
北大核心
2010年第3期259-264,共6页
Journal of Seismological Research
基金
云南省人民政府十项重大措施"云南强震活动与板缘动力学机制研究"
中国地震局震情跟踪合同制定向工作任务"云南东部地区强地震短临动态跟踪研究"(2009010204)联合资助
关键词
波速比
震源深度
中小地震
强震活跃期
云南
wave-velocity ratio
focal depth
medium-small earthquake
active period
Yunnan
