SEISMOLOGY AND GEOLOGY ›› 1997, Vol. 19 ›› Issue (2): 155-163.

• Brief Report • Previous Articles     Next Articles

GEOELECTRICAL STRUCTURE OF THE CRUST AND UPPLE MANTLE IN THE XINGTAI EARTHQUAKE AREA AND ITS TECTONIC IMPLICATIONS

Deng Qianhui1, Zhang Musheng1, Zhan Yan1, Tang Ji1, Zhao Guoze1, Liu Tiesheng1, Zhu Zuoquan2, Liu Baoqin2, Jia Zheng2, Li Zhuguo2, Qu Jianpeng2   

  1. 1. Institute of Geology, SSB, Beijing 100029;
    2. Earthquake Research Institute of Lanzhou, SSB, Lanzhou 730000
  • Received:1996-02-29 Revised:1996-12-31 Online:1997-06-11 Published:2009-11-25

邢台震区地壳上地幔电性结构及其构造意义

邓前辉1, 张木生1, 詹艳1, 汤吉1, 赵国泽1, 刘铁胜1, 朱佐权2, 刘宝勤2, 贾政2, 李柱国2, 屈健鹏2   

  1. 1. 国家地震局地质研究所, 北京, 100029;
    2. 国家地震局兰州地震研究所, 兰州, 730000
  • 基金资助:
    国家"八五"攻关项目(85907020103)

Abstract: Magnetotelluric (MT) sounding observations have been carried out along four profiles in the Xingtai earthquake area and its neighbouring regions. The results show characteristics of the geoelectrical structure of the crust and upper mantle for this region. The focal area looks like complex,while the surrounding area seems to be simple. The range of seismogenic depth is more complicated than the other depth range. Sharp changes of the electrical structure of the focal area indicate the hidden faults with steep angles. High conductive layers may represent the detachments of 10~20km depth. Upper mantle uplift is likely associated with upward migration of mantle material. These features are of great importance to understanding the tectonic background of the study region,the seismogenic structure,and relation between shallow and deep structure.

Key words: Magnetotelluric sounding, Resistivity, Crust-mantle structure, Xingtai earthquake

摘要: 用大地电磁测深(MT)方法在邢台地震区作了4条观测剖面,资料解释结果表明探测区地壳上地幔的电性结构主要特征为:震源区复杂,周边区简单;发震深度复杂,非发震深度简单;震源区电性突变,显示隐伏高角度断裂;高导层代表10km和20km深度的滑脱面;地幔上隆可能意味着地幔物质向上运移。这些观测结果对于了解测区构造背景、发震构造和深浅构造的关系有重要意义。

关键词: 大地电磁测深, 电阻率, 壳幔构造, 邢台地震