1995～1996年云南三次强震前地震活动的年度异常
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摘要
通过对地震活动年度预报指标的研究，发现１９９４年云南地区的地震活动异常突出。不仅频度、能量、ｂ值、小震调制比、响应比等常规的地震学参量有异常，而且地震波速比、尾波持续时间比、振幅比和高剪切应力值等均出现异常。异常项目多且幅度大，已具备了强震发生的条件。异常在空间分布上尤以滇西南地区集中，次为滇西北。这些异常为判定１９９５～１９９６年云南三次强震的发生提供了重要依据。
Study on seismicity annual index has found prominent seismicity anomalies in 1994 in Yunnar which not only included conventional seismological items, such as frequency, energy, b value, modulation ratio for small earthquake and response ratio, but also involved seismic wave velocity, continuous the ratio of code wave, amplitude ratio and high shear stress value. The anomalies with multiple items and great extent indicated earthquake would occur. The anomalies in space distribution first were concentrated in the Southwest Yunnan, Second in the Northwest Yunnan. These anomalies provided an important basis for judging the Strong earthquakes occurred in 1995 in Yunnan.
Study on seismicity annual index has found prominent seismicity anomalies in 1994 in Yunnar which not only included conventional seismological items, such as frequency, energy, b value, modulation ratio for small earthquake and response ratio, but also involved seismic wave velocity, continuous the ratio of code wave, amplitude ratio and high shear stress value. The anomalies with multiple items and great extent indicated earthquake would occur. The anomalies in space distribution first were concentrated in the Southwest Yunnan, Second in the Northwest Yunnan. These anomalies provided an important basis for judging the Strong earthquakes occurred in 1995 in Yunnan.
引文
1 龙晓帆,王绍晋.丽江7.0级地震前地震用活动特征.地震研究,1997,20(3):259～264
2杨继登.对滇东地区强震幕式活动与强震趋势的探讨。地震研究, 1997,20(4): 365-372
3杨继登,范杨,雷素华,等.1995-1996云南孟连西、武定、丽江三次强震的地震活动背景异常华南地震,1999, 18(4):41-49
4陈立德,罗平.1995年7月12日孟连中缅边界7.3级地震中短临预报及前兆异常特征(1).地震研究,1997,20 (2): 151- 156
5马宗晋.华北地壳的多点场(应力集中)与地震.地震地质, 1980,20(2): 1-6
2杨继登.对滇东地区强震幕式活动与强震趋势的探讨。地震研究, 1997,20(4): 365-372
3杨继登,范杨,雷素华,等.1995-1996云南孟连西、武定、丽江三次强震的地震活动背景异常华南地震,1999, 18(4):41-49
4陈立德,罗平.1995年7月12日孟连中缅边界7.3级地震中短临预报及前兆异常特征(1).地震研究,1997,20 (2): 151- 156
5马宗晋.华北地壳的多点场(应力集中)与地震.地震地质, 1980,20(2): 1-6
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