| 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].西北地震学报,1999,21(1):15. |
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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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| 摘 要： |
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| 文章编号： | 1000-0844(1999)01-0001-06 |
| 修稿时间： | 1998-05-12 |
CHARACTERISTICS OF
HYDROCHEMICAL PRECURSORY FIELD BEFORE
THE GONGHE MS7.0 EARTHQUAKE |
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| Abstract: | The
features of Hydrochemical precursory field before the Gonghe MS7.0 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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