| 晋冀蒙三省交界区中强地震前地震视应变演化分析 |
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| 引用本文： | 张登科,李惠玲.晋冀蒙三省交界区中强地震前地震视应变演化分析[J].山西地震,2014(3):5-11. |
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| 作者姓名： | 张登科 李惠玲 |
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| 作者单位： | 1. 山西大同市地震局,山西 大同,037008
2. 山西省地震局，山西 太原 030021; 太原大陆裂谷动力学国家野外科学观测研究站，山西 太原 030025 |
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| 基金项目： | 山西省地震局科研课题(SBK-1322)。 |
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| 摘 要： | 选取1970年至1999年晋冀蒙三省交界4次中强地震事件,进行地震视应变演化分析。得出,地震视应变异常与晋冀蒙三省交界区中强以上地震具有较好的对应关系。震前,晋冀蒙三省交界区地震视应变演化模式有:增强-减弱-发震、增强-减弱-迁移-发震、增强-减弱-消失-增强-发震、增强-减弱-维持-发震。"大同窗"必是异常区,其震前地震视应变演化模式有:增强-维持-消失-发震、增强-减弱-发震、增强-维持-减弱-发震。异常区多形成于震前3年,随着时间的推移,有扩散或向特定方向(震源方向)迁移的特征。中强地震多发生在视应变高值异常区、视应变高值异常迁移区、视应变高值异常区迁移的方向。
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| 关 键 词： | 地震视应变 异常区 晋冀蒙交界区地震 |
Evolution of Seismic Apparent Strain before Medium Strong Earthquakes in Juncture Area of Shanxi,Hebei and Inner Mongolia |
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| ZHANG Deng-ke,LI Hui-ling.Evolution of Seismic Apparent Strain before Medium Strong Earthquakes in Juncture Area of Shanxi,Hebei and Inner Mongolia[J].Earthquake Research in Shanxi,2014(3):5-11. |
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| Authors: | ZHANG Deng-ke LI Hui-ling |
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| Institution: | ZHANG Deng-ke,LI Hui-ling ( 1. Earthquake Administration of Datong City, Datong, Shanxi 037008, China; 2. Earthquake Administration of Shanxi Province, Taiyuan, Shanxi 030021, China; 3. State Key Observatory of Shanxi Rift System, Taiyuan, Shanxi 030025, China) |
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| Abstract: | 4 medium strong earthquakes in juncture area of Shanxi ,Hebei and Inner Mongolia from 1970 to 1999 are selected to ana-lyze the evolution of seismic apparent strain .It is concluded that there is a good corresponding relationship between anomaly of seis-mic apparent strain and medium strong earthquakes in the juncture area .Before earthquake ,the evolution modes of seismic apparent strain in the juncture area contain strengthen-weaken-outburst , strengthen-weaken-migration-outburst , strengthen-weaken-fade-strengthen-outburst and strengthen-weaken-maintain-outburst .“Datong window”must be an anomalous area ,in which the evolution modes of seismic apparent strain before earthquake contain strengthen-maintain-fade-outburst , strengthen-weaken-outburst and strengthen-maintain-weaken-outburst .Anomalous area formed mostly in three years before the earthquake and ,anomalous area spread or migrate to the specific direction （focal direction） as time going on .Medium strong earthquakes occur mostly in the anoma-lous area ,the anomalous migration area and the migration direction of anomalous area of high apparent strain value . |
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| Keywords: | Seismic apparent strain Anomalous area Earthquakes in juncture area of Shanxi Hebei and Inner Mongolia |
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