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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。
The change of geoelectric field is related to the hydrological, meteorological and geological background of the site environment. Eleven geoelectric field stations in the northeastern Qinghai-Tibet Plateau are at an elevated altitude. According to the properties of sites under the site, they are classified into A (Loess) and B (prairie) stations. Through the calculation and analysis of the geoelectric field and the earth current field in the seasonal frozen soil region of the Qinghai-Tibet Plateau, the following recognitions are made in connection with the regional tectonic activities and the geological environment: The change of the geoelectric field in the seasonal frozen soil region of the northeastern Qinghai-Tibet Plateau responds significantly to the hydrothermal environment, The winter and summer seasons may change in value. The long-period geoelectric field curve may be related to the temperature change near the site. The direction and magnitude of the earth current vector changes during the freeze-thaw cycles of the frozen soil. A and B sites show different seasonal variation patterns, and the time curve of the rise and fall of the geoelectric field curves are different. This phenomenon can be applied to monitor the frozen-thaw situation of the frozen soil and the temporal and spatial evolution of the frozen soil.