| 景泰5.9级地震的断层形变异常及中短期预报 |
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| 引用本文： | 王双绪,江在森,陈文胜,张希,陈兵,张四新,王继英.景泰5.9级地震的断层形变异常及中短期预报[J].地震学报,2001,23(2):151-158. |
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| 作者姓名： | 王双绪 江在森 陈文胜 张希 陈兵 张四新 王继英 |
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| 作者单位： | （中国西安710054 中国地震局第二地形变监测中心） |
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| 基金项目： | 国家重点基础研究发展规划《大陆强震机理与预测》项目! ( G19980 4 0 70 3和 G19980 4 0 70 5)，“九五”国家科技攻关
项目 !(加强部 |
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| 摘 要： | 初步研究了2000年6月6日甘肃景泰5.9级地震蕴育过程中近源区及外围地区断层形变异常的时空分布特征:震前断层形变异常分布范围广、异常形态复杂，断层形变（应变）类信息指标图象异常区明显．不同地域断层形变异常形态及幅度存在显著差异，与异常所处的构造部位密切相关:海原断裂带西段出现的，，相断层形变异常，显示了近源区断层运动由准线性走向非线性的过程，与断层形变（应变）类信息指标高值异常区相配合，反映蕴震区应变积累程度高；而构造汇聚部位的六盘山断裂带等远场区较大幅度的突跳尖点异常，并不反映所在地的应变积累，而可能是蕴震过程区域构造应力场增强的一个标志．在此基础上，结合对景泰5.9级地震中短期预报经验教训的初步总结，研究和探讨了断层形变异常在震情判定中的应用．
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| 关 键 词： | 景泰5.9级地震 断层形变 异常特征 中短期预报 |
| 文章编号： | 0253-3782(2001)02-0151-08 |
| 修稿时间： | 2000年7月21日 |
FAULT DEFORMATION ANOMALY AND MEDIUM AND SHORT-TERM PREDICTION OF JINGTAI MS5.9 EARTHQUAKE |
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| Wang Shuangxu,Jiang Zaisen,Chen Wensheng,Zhang Xi,Chen Bing,Zhang Sixin,Wang Jiying.FAULT DEFORMATION ANOMALY AND MEDIUM AND SHORT-TERM PREDICTION OF JINGTAI MS5.9 EARTHQUAKE[J].Acta Seismologica Sinica,2001,23(2):151-158. |
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| Authors: | Wang Shuangxu Jiang Zaisen Chen Wensheng Zhang Xi Chen Bing Zhang Sixin Wang Jiying |
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| Abstract: | The time-space distribution characteristics of fault deformation anomaly in the near-source region and its outlying zone in the seismogenic process of Jingtai MS5.9 earthquake occurred on June 6, 2000 in Gansu province is studied preliminarily. The distribution scope of fault deformation anomaly before the earthquake is wide, the anomaly shape is complicated and the pattern anomalous zone of fault deformation (strain) information index is obvious. The shape and amplitude of fault deformation anomaly in different regions differ significantly, which is closely related to the tectonic location of anomaly. The fault deformation anomaly of α,β and γ phases along the western segment of Haiyuan fault zone shows the process from the quasi-linearity to non-linearity of fault movement in the near-source region, matches the high-value anomalous area of fault deformation (strain) information index, and reflects the high strain accumulation in the seismogenic region. However, the anomaly of abrupt jump and cusp with a large amplitude occurred in the areas far from the earthquake, such as Liupanshan fault zone which is the tectonic convergent section does not reflect the strain accumulation of its location, maybe it is a sign that the regional tectonic stress field is strengthened in the seismogenic process. Based on the above-mentioned facts and combined with the preliminary summary of experiences and lessons in the medium and short-term prediction of Jingtai MS5.9 earthquake, we study and explore the application of fault deformation anomaly to earthquake judgement. |
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| Keywords: | Jingtai M S5 9 earthquake fault deformation anomaly characteristics medium and short term earthquake prediction |
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