云南地区强震前波速比、震源深度及中小地震活动的特征
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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.
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.
引文
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赵晋明,胡毅力,王彬,等.1996.在真三轴压缩条件下片麻岩破裂孕育过程中弹性波的特征变化[J].地震地质,18(3):277-281.
L ee WHK,Stewart S W.1984.微震台网的原理及应用[M].唐美华,译,北京:地震出版社.
蔡静观,张喜玲.1999.丽江、宁蒗强震的波速比时空演化图象和数值分析[J].中国地震,15(1):82-91.
傅征祥.1997.中国大陆地震活动性力学研究[M].北京:地震出版社.
梅世容,冯德益,张国民,等.1993.中国地震预报概论[M].北京:地震出版社.
李永莉,毛慧玲,付虹.2007.2007年宁洱6.4级地震前地震学异常的动态演化[J].地震研究,30(4):318-323.
李永莉,毛慧玲,赵小艳,等.2008.云南地区数字地震波波速比的区域特征[J].地震研究,31(3):203-208.
李永莉,毛慧玲,苏有锦.2009.滇西地区近期强震前的波速比异常演化[J].地震研究,32(1):6-11.
毛慧玲,李永莉.2004.云南地区强震前震源深度的时空展布[J].地震地磁观测与研究,25(3):32-40.
苏有锦,李忠华,刘祖荫,等.2001.20世纪云南地区MS≥5.0级地震活动的基本特征[J].地震研究,24(1):1-9.
赵晋明,胡毅力,王彬,等.1996.在真三轴压缩条件下片麻岩破裂孕育过程中弹性波的特征变化[J].地震地质,18(3):277-281.
L ee WHK,Stewart S W.1984.微震台网的原理及应用[M].唐美华,译,北京:地震出版社.
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