| 1990年共和7.0级地震水化学前兆场特征 |
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| 引用本文： | 王长岭,张慧,张佩山. 1990年共和7.0级地震水化学前兆场特征[J]. 地震工程学报, 1999, 21(1): 1-6 |
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| 作者姓名： | 王长岭 张慧 张佩山 |
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| 作者单位： | 中国地震局兰州地震研究所,甘肃,兰州,730000 |
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| 基金项目： | 中国地震局“九五”攻关项目 |
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| 摘 要： | 研究了１９９０年４月２６日共和７．０级地震的水化学前兆场特征．结果表明：在震源区水化学趋势性异常所占的比例大，远离震源区所占的比例小，且有逐渐减小的趋势；在震源区水化学趋势性异常起始的时间早，远离震源区异常起始的时间晚，趋势异常的形态均为逐渐升高．研究认为，水化学前兆场的形成与区域应力场有关，但与震源应力场关系密切，而且起主导作用的可能是震源应力场
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| 关 键 词： | 水化学；水氡；氡异常；异常特征；前兆场；共和地震 |
| 收稿时间： | 1998-05-12 |
CHARACTERISTICS OF HYDROCHEMICAL PRECURSORY FIELD BEFORE THE GONGHE MS7.0 EARTHQUAKE |
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| WANG Chang-ling,ZHANG Hui and ZHANG Pei-shan. CHARACTERISTICS OF HYDROCHEMICAL PRECURSORY FIELD BEFORE THE GONGHE MS7.0 EARTHQUAKE[J]. China Earthguake Engineering Journal, 1999, 21(1): 1-6 |
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| Authors: | WANG Chang-ling ZHANG Hui ZHANG Pei-shan |
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| Affiliation: | Lanzhou Institute of Seismology, CSB, Lanzhou Gansu 730000,Lanzhou Institute of Seismology, CSB, Lanzhou Gansu 730000 and Lanzhou Institute of Seismology, CSB, Lanzhou Gansu 730000 |
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| Abstract: | The features of Hydrochemical precursory field before the Gonghe M S7.0 earthquake on April 20,1990 are studied.The results show that proportion of hydrochemistry observation sites in which trend anomalies appear to all sites in focal region of the earthquake is higher than that far away from the focal region and the proportion reduces gradually as the epicentral distance increases.In the focal area the trend anomalies in which radon content in groundwater goes up gradually emerge earlier than far away from foci.The formation of hydrochemical precursory field has something to do with regional stress field,but has closer relation with focal stress field.Focal stress field may play a main role in the precursory process. |
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| Keywords: | Hydrochemistry Radon in groundwater Radon anomaly Anomalous character Precursory field Gonghe earthquake |
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