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地震 ›› 2002, Vol. 22 ›› Issue (4): 114-122.

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张北地震地下流体异常场的研究

黄辅琼1, 邓志辉2, 顾瑾平1, 王慧敏1, 吕培苓1   

  1. 1.中国地震局分析预报中心, 北京 100036;
    2.中国地震局地质研究所, 北京 100029
  • 收稿日期:2002-07-02 修回日期:2002-07-06 发布日期:2021-12-21
  • 作者简介:黄辅琼(1967-),女,重庆市人,副研究员,1993年获硕士学位,2002年在读博士生,主要从事地震预报研究。
  • 基金资助:
    国家重大基础理论973项目(959130503); 地震科学联合基金项目(100090)

Re search of the field of subsurface fluid anomalies before the Zhangbei earthquake

HUANG Fu-qiong1, DENG Zhi-hui2, GU Jin-ping1, WANG Hui-min1, LU Pei-ling1   

  1. 1. Center for Analysis and Prediction, CSB, Beijing 100036, China;
    2. Institute of Geology, CSB, Beijing 100029, China
  • Received:2002-07-02 Revised:2002-07-06 Published:2021-12-21

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摘要： 对比研究了张北MS 6. 2和MS5. 6地震前地下流体异常时空演化特征。结合二次地震前的地震活动图像及其迁移规律, 二次地震所产生的地表宏观裂度与地震的震源机制解, 研究结果认为: 地下流体趋势异常空间分布受区域构造格局控制; 短期异常具有重复性, 可能受震源机制影响; 短期异常的强度、临震异常形态的差异性以及地震宏观破裂的差异性与地震强度和交替活动的构造有关; MS 5. 6地震应为MS 6. 2地震后该地区能量的进一步释放, 并且是NE向构造带与近EW向构造带交替活动的结果; 二次地震前的短期异常主要沿着近EW向张家口-渤海构造带分布, 可能说明近EW 向张家口-渤海构造带活动水平高于N E向山西构造带。

关键词: 地下流体, 异常场, 构造带交替活动, 张北地震

Abstract: The features of subsurface fluid anomalies before Zhang bei earthquakes with MS 6. 2 and MS 5. 6 have been com paratively re searched. Combining the focal mechanisms and the isoseismal contours of the two events, with the pattern of the small tomoderate seismic activity before the two events, some re search results are obtained as follows. ① MS 5. 6 earthquake is a strong after shock of MS 6. 2 earthquake, and these two events might be caused by the alternating slip of two intersecting tectonic belts; ② the distribution of long-term subsurface fluid anomalies was controlled by the tectonic belts; ③ the short-term subsurface anomalies were located along Zhangjiakou-Bohai tectonic belt trending EW, which might imply that the Zhangjiakou-Bohai tectonic belt would be more active than the others; ④ the reason that the typical shortterm anomalies in some stations occurred repeatedly before the two events might be the similar focal mechanisms; ⑤ the difference of the intensity of the shorttermanomalies and of the iso seismal contours might be caused by difference of the seismic intensity of the two events.

Key words: Subsurface fluid, Field of anomalies, Alternating movement of two intersecting belts, Zhang bei earthquake

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