地电场对青藏高原东北部季节冻土的响应特性

发布时间：2018-07-08 18:32

本文选题：地电场 + 青藏高原东北部　；参考：《冰川冻土》2017年04期

【摘要】：地电场的变化与台址环境的水文、气象及地质背景等相关,在青藏高原东北部季节冻土区,11个地电场台站处于较高的海拔,据台址下覆场地属性分为A类(黄土型)和B类(高原草场型)台站。通过对青藏高原季节冻土区域的地电场和大地电流场的计算和分析,联系区域构造活动和地质环境得出以下认识:青藏高原东北部季节冻土区地电场变化对水热环境响应明显,冬、夏两季测值可能发生跃变;长周期的地电场变化曲线可能与台址附近气温变化相关;台站大地电流矢量在冻土部分冻融交替过程中发生方向和幅度值的改变。A类和B类台址显示出不同的季节变化规律,地电场曲线上升和下降的时间节点各异,这种现象可应用于监测该区域冻土冻融情况和冻土的时空演变。
[Abstract]:The variation of geoelectric field is related to the hydrological, meteorological and geological background of the site environment. In the seasonal permafrost region of the northeast Qinghai-Tibet Plateau, 11 geoelectric field stations are at high altitude. According to the attribute of the overlying site, it can be divided into A type (loess type) and B type (plateau grassland type) stations. Based on the calculation and analysis of the geoelectric field and geoelectric current field in the seasonal frozen soil area of the Qinghai-Tibet Plateau, the following conclusions are obtained: the variation of the geoelectric field in the seasonal frozen soil region of the northeastern Qinghai-Xizang Plateau is obviously responsive to the hydrothermal environment. The measured values in winter and summer may jump, and the long period geoelectric field change curve may be related to the temperature change near the site. The change of direction and amplitude of geoelectric current vector in the process of freezing and thawing in frozen soil. Class A and B stations show different seasonal variation laws, and the time nodes for the rise and fall of geoelectric field curve are different. This phenomenon can be used to monitor frozen soil freeze-thaw and temporal and spatial evolution of frozen soil in this region.
【作者单位】：中国地震局兰州地震研究所;广东省地震局;江苏省地震局南京基准地震台;
【基金】：国家自然科学基金项目(41374080)资助
【分类号】：P642.14;TU445

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