| 大姚地震前连续形变短期前兆特征 |
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| 引用本文： | 张立,牛安福,汤曙恩,王永安.大姚地震前连续形变短期前兆特征[J].地震,2005,25(2):75-82. |
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| 作者姓名： | 张立 牛安福 汤曙恩 王永安 |
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| 作者单位： | 云南省地震局,云南,昆明,650041;中国科学技术大学地球和空间科学学院,安徽,合肥,230026;中国地震台网中心,北京,100036;昆明市防震减灾局,云南,昆明,650011;云南省地震局,云南,昆明,650041 |
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| 摘 要： | 总结了2003年大姚6．2级地震云南模拟与数字化形变变化的短期异常特征。由模拟形变观测资料显示倾斜单分向加速变化显著，震前均出现转折变化；地应力阶变及大幅度波动为震前异常形态，而重力没有异常出现。异常展布距震中97～346km，异常台站比(距震中400km范围)为35．7％。数字化形变的9个测项中，楚雄倾斜和应变最为显著，尽管与降雨影响有关，但仍认为具有短期前兆意义。
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| 关 键 词： | 大姚地震 连续形变 模拟和数字化 短期前兆 |
| 文章编号： | 1000-3274(2005)02-0075-08 |
| 修稿时间： | 2004年6月14日 |
Successive deformation short-term precursor characteristics before the Dayao earthquake |
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| ZHANG Li,NIU An-fu,TANG Shu-en,WANG Yong-an.Successive deformation short-term precursor characteristics before the Dayao earthquake[J].Earthquake,2005,25(2):75-82. |
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| Authors: | ZHANG Li NIU An-fu TANG Shu-en WANG Yong-an |
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| Abstract: | This paper summarized the short-term anomalous characteristics of simulated and numeralized deformation before the Dayao M_S6.2 earthquake, 2003 in Yunnan Province. Simulated deformation tilt one-way data demonstrated the obvious expediting change and turning change; crustal stress demonstrates step change and big amplitude motion change before the earthquake; gravity has not shown anomaly. Anomalous distribution is 97 km to 346 km from the epicenter. The anomalous station ratio (within distance of 400 km from the epicenter) is 35.7%. Among 9 observation items of numeralized deformation, tilt and crustal stress at Chuxiong station show outstanding change, though it is impacted by rainfall, it still has short-term precursory significance. |
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| Keywords: | Dayao earthquake Successive deformation Simulating and Numeralization Short-term precursor |
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