本文選題：地電場 + 青藏高原東北部　； 參考：《冰川凍土》2017年04期

【摘要】：地電場的變化與臺址環(huán)境的水文、氣象及地質(zhì)背景等相關(guān),在青藏高原東北部季節(jié)凍土區(qū),11個地電場臺站處于較高的海拔,據(jù)臺址下覆場地屬性分為A類(黃土型)和B類(高原草場型)臺站。通過對青藏高原季節(jié)凍土區(qū)域的地電場和大地電流場的計算和分析,聯(lián)系區(qū)域構(gòu)造活動和地質(zhì)環(huán)境得出以下認識:青藏高原東北部季節(jié)凍土區(qū)地電場變化對水熱環(huán)境響應(yīng)明顯,冬、夏兩季測值可能發(fā)生躍變;長周期的地電場變化曲線可能與臺址附近氣溫變化相關(guān);臺站大地電流矢量在凍土部分凍融交替過程中發(fā)生方向和幅度值的改變。A類和B類臺址顯示出不同的季節(jié)變化規(guī)律,地電場曲線上升和下降的時間節(jié)點各異,這種現(xiàn)象可應(yīng)用于監(jiān)測該區(qū)域凍土凍融情況和凍土的時空演變。
[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.
【作者單位】： 中國地震局蘭州地震研究所;廣東省地震局;江蘇省地震局南京基準(zhǔn)地震臺;
【基金】：國家自然科學(xué)基金項目(41374080)資助
【分類號】：P642.14;TU445

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