南北地震带大地电流分布与地震活动关系探讨

发布时间：2018-04-13 13:36

本文选题：地电场 + 大地电流　；参考：《地学前缘》2017年02期

【摘要】：利用中国南北地震带38个固定地电场台站观测数据,研究该区大地电流场流线和电流矢量的分布特点,分析了大地电流矢量场的涡度和散度,并联系动力学机制讨论了大地电流与南北地震带的关系,探讨地震活动与电流涡度时变的对应性。这是首次应用空间密度较高的地电场台站开展这方面的研究工作。结果表明:(1)大地电流线走向和汇聚特点与构造地块的运动特点具有某种一致性,在构造边界上大地电流矢量存在汇集及分异的现象;(2)大地电流汇聚和发散等现象与断裂构造相关,一般表现为流线沿断裂带走向汇集或发散,在断裂交错地区表现出较复杂的形态;(3)大地电流场涡度分布特点可作为大构造块体运移的电性指示,涡度随时间变化可能为某种地震前兆。
[Abstract]:Based on the observational data of 38 stationary geoelectric field stations in the north-south seismic belt of China, the distribution characteristics of the current field streamline and current vector in this area are studied, and the vorticity and divergence of the geoelectric current vector field are analyzed.The relationship between the geoelectric current and the north and south seismic belts is discussed, and the correspondence between seismic activity and the time-varying current vorticity is discussed.This is the first time that the geoelectric field stations with high spatial density are used to carry out the research in this field.The results show that the strike and convergence characteristics of the geodetic current line are consistent with the movement of the tectonic block.(2) the convergence and divergence of geoelectric current are related to the fault structure, and generally show that the streamline gathers or diverges along the strike of the fault zone.The vorticity distribution of the earth current field can be used as an electrical indicator of the movement of large tectonic blocks, and the variation of vorticity with time may be a kind of earthquake precursor.
【作者单位】：中国地震局兰州地震研究所;兰州地球物理国家野外科学观测研究站;南京基准地震台;
【基金】：国家自然科学基金项目(41374080)
【分类号】：P315.722

【相似文献】