| 1983年菏泽5.9级地震前地下流体异常分布特征及其有关问题讨论 |
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| 引用本文： | 耿杰,张昭栋.1983年菏泽5.9级地震前地下流体异常分布特征及其有关问题讨论[J].华北地震科学,1998,16(2):15-22. |
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| 作者姓名： | 耿杰 张昭栋 |
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| 作者单位： | 山东省地震局!济南，250014 |
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| 基金项目： | 国家地震局“九．五”攻关合同制项目!95—04—04—03—04 |
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| 摘 要： | 全面、系统地分析研究了菏泽５．９级地夺前地下流体异常时空分布及其场兆、源兆特征。结果表明，异常空间分布与活动构造密切相关，断裂端部和交汇处是异常响应的第三地区。单位面积异常台项数，震中及附近地区远高于外围地区。震前１个月左右，异常台项月频次大幅度增高，单项异常的时间演化有持续型、完整型和突跳型三种类型。源兆异常具有中期、短期、临震异常配套、水化我组分同步异常变化、宏观异常多点成片、持续时间长、幅度
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| 关 键 词： | 流体动力学 源场效应 地震 地震前兆 分布特征 |
DISCUSSION ON THE DISTRIBUTION CHARACTERISTICS OF SUBSURFACE FLUID ANOMALIES BEFORE THE HEZE 1983 M5. 9 EARTHQUAKE AND THE RELATIVE ISSUES CONCERNED |
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| Geng Jie, Zhang Zhaodong.DISCUSSION ON THE DISTRIBUTION CHARACTERISTICS OF SUBSURFACE FLUID ANOMALIES BEFORE THE HEZE 1983 M5. 9 EARTHQUAKE AND THE RELATIVE ISSUES CONCERNED[J].North China Earthquake Sciences,1998,16(2):15-22. |
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| Authors: | Geng Jie Zhang Zhaodong |
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| Abstract: | This paper has completely and systematically analyzed the spacio- temporal distribution of subsurface fluid anomalies before the Heze M5. 9 earthquake and the characteristics of its field precursor and source precursor. The result shows that the spacio - temporal distribution of the anomalies is more closely related to active tectonics, the ends and intersections of faults are sensitive areas of anomalies.The number of anomalous items in per unit area is higher in the epicenter and its near area than in the outlying area. About one month before the earthquake, the monthly frequence of anomalous items increased with large amplitude, the time evolution of single anomaly in three types, that is continous type,complete type and sudden jump type. Source precursor anomalies showed characteristics of a complete set of long term, short term and imminent anomalies, of synchronous anomalous variation of hydrochemical multi-components, macroscopic anomalies at many points, long time and large amplitude. The fiekd precursors are mainly short term and imminent anomalies, showing single items. The anomaly at a single point showed characteristics of short time and small amplitude. This paper also has discussed the relation between field precursor, source precursor and stress field, the relation between anomalies distribution and tectonics, the relation between spacio- temporal distribution of anomalies and earthquake occurrence place, and the relation between spacio-temporal distribution of anomalies and earthquake occurrence time. |
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| Keywords: | subsurface fluid source precursor field precursor Heze earthquake |
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