大同地震前跨断层形变年速率比时空微动态演化特征
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摘要
研究探索了由跨断层形变测量资料提取无量纲的年速率比γh 和γ1 的新方法 ,并给出了整个测量区域速率比的时空分布和演化特征。研究结果表明 :(1 )中强地震前近源区形变年速率比在空间上、时间上存在中短及短期异常 ;(2 )中短期异常显示 ,震前 1～ 2年近源区年速率比正值(或负值 )有逐渐增大范围、量值的趋势 ,震源区速率比值较小 ,似处于闭锁状态 ;(3)短期异常显示 ,震前 3个月速率比值增高 ,空间上呈现大范围正负值区异常分布 ,图像形态发生显著变化。
A new method of ratio γ h and γ 1 of the dimensionless annual rate obtained with the cross fault defromation measurement data is searched. The temporal and spatial distrubutions and evolutional characteristics of the rate ratio of the total measuremental area are given. It is concluded that 1) before a moderate earthquake near source area annual rate ratio of deformation has the temporal and spatial short medium anomalies, 2) in 1～2 years before the earthquake the positive or negative annual rate ratio of near source area gradually increases in distrubution and value of anomaly, although the ratio of source area is less, which likely enter into a close condition, 3) in 3 months before the earthquake the ratio increases, its positive or negative anomaly distrubutions extend and the pattern obviously changes.
A new method of ratio γ h and γ 1 of the dimensionless annual rate obtained with the cross fault defromation measurement data is searched. The temporal and spatial distrubutions and evolutional characteristics of the rate ratio of the total measuremental area are given. It is concluded that 1) before a moderate earthquake near source area annual rate ratio of deformation has the temporal and spatial short medium anomalies, 2) in 1～2 years before the earthquake the positive or negative annual rate ratio of near source area gradually increases in distrubution and value of anomaly, although the ratio of source area is less, which likely enter into a close condition, 3) in 3 months before the earthquake the ratio increases, its positive or negative anomaly distrubutions extend and the pattern obviously changes.
引文
[1 ] 丁国瑜 .中国的活断层 [A] .国家地震科技监测司编 .大陆地震活动和地震预报国际学术讨论会论文集[C] .北京 :地震出版社 ,1 984.1 4 9- 1 63.
[2 ] 张祖胜 .应用大地形变测量资料估计我国近几十年的地震趋势 [A] .国家地震局分析预报中心编 .中国地震大形势预测研究 [C] .北京 :地震出版社 ,1 990 .50 - 65.
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[4] 车兆宏 ,刘天海 ,尹荣珍 .大同阳高 6 1级地震大地形变前兆研究 [A] .国家地震局科技监测司 .大同阳高地震研究 [C] .北京 :地震出版社 ,1 993 .58- 66 .
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