云南强震前地震活动因子A值异常动态演变特征
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摘要
运用地震活动因子A值参数全面、深入地研究了云南强震前尤其是强震活跃期首发强震前地震活动在时间、空间的动态演变过程,研究结果显示:(1)强震前1～2年,在未来震中周围A值出现显著高值变化,异常阀值为A≥0.6;(2)强震前3～4年,A≥0.6的高值异常区主要分布在云南省外围或边界附近,省内A值异常较少。随着强震的临近,A值异常面积逐渐增大,并且向省内、未来震中迁移,震前1年或1～2年云南地区A值异常单位面积和省内外异常单位面积的比值出现明显转折回升。
We studied the temporal and spatial dynamic evolution of seismicity factor A-value before strong earthquakes,especially before the first shock in the active period of strong earthquakes in Yunnan.The results show as follows:(1) A-value would appear evident high value near future epicenters during 1 ～ 2 years before strong earthquakes,abnormal value is A≥0.6.(2) The high value anomalous areas of A≥0.6 mainly distributed in the surrounding areas or the boundary areas of Yunnan Province,but rarely distributed in the inner of Yunnan Province during 3 ～ 4 years before strong earthquakes.With the approach of the strong earthquakes occurred,the areas in which A-value was abnormal expanded gradually and moved toward the future epicenters or the inner of Yunnan Province.During one year or 1 ～ 2 years before strong earthquakes,the unit area in which A-value was abnormal in Yunnan and the ratio of the unit area in which A-value was abnormal between inside and outside of Yunnan significantly turned and picked up.
We studied the temporal and spatial dynamic evolution of seismicity factor A-value before strong earthquakes,especially before the first shock in the active period of strong earthquakes in Yunnan.The results show as follows:(1) A-value would appear evident high value near future epicenters during 1 ～ 2 years before strong earthquakes,abnormal value is A≥0.6.(2) The high value anomalous areas of A≥0.6 mainly distributed in the surrounding areas or the boundary areas of Yunnan Province,but rarely distributed in the inner of Yunnan Province during 3 ～ 4 years before strong earthquakes.With the approach of the strong earthquakes occurred,the areas in which A-value was abnormal expanded gradually and moved toward the future epicenters or the inner of Yunnan Province.During one year or 1 ～ 2 years before strong earthquakes,the unit area in which A-value was abnormal in Yunnan and the ratio of the unit area in which A-value was abnormal between inside and outside of Yunnan significantly turned and picked up.
引文
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刘翔,吴国华,付虹,等.2010.滇西北强震活动特征及短期震兆研究[J].地震研究,33(1):7-13.
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刘翔,秦嘉政,苏有锦,等.2002.云南地区中强地震活动韵律特征[J].地震研究,25(增刊):33-39.
刘翔,苏有锦,和宏伟,等.2005.川滇强震震前短期阶段地震活动空间异常特征[J].地震研究,28(4):313-319.
刘翔,吴国华,付虹,等.2010.滇西北强震活动特征及短期震兆研究[J].地震研究,33(1):7-13.
王炜,戴维乐,黄冰树.1994.地震震级的统计分布及其地震强度因子Mf值在华北中强以上地震前的异常变化[J].中国地震,10(增刊):95-109.
王炜,刘震华.1987.地震时间间隔的统计分布及其地震危险度D值在华北大震前的异常变化[J].地震学报,9(2):113-127.
王炜,潘坚云,黄冰树.1989.地震空间集中度C值及其在地震预报中的应用[C]//国家地震局科技监测司.地震预报实用化研究文集(地震学专辑).北京:学术书刊出版社.
王炜,宋先月,刘峥,等.1999.地震活动因子A值及其在华北地震中期预报中的应用[J].中国地震,15(1):35-45.
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