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在长白山火山区及其附近 ,沿 5条伞状测线和 1条北西向测线进行了 6 1个大地电磁测深点的观测。用Robust等方法对观测资料进行了处理 ;应用阻抗张量分解方法消除了局部不均匀体的影响 ;计算了反映地下横向不均匀性的地磁感应矢量。利用RRI二维自动反演等技术对资料进行了解释。结果表明 :在近地表存在低阻体 ,并分别与长白山天池水体、聚龙泉温泉、锦江温泉及长白山山门附近的地下水相对应。在长白山天池及其以北和以东地区 ,约 12km深处存在电阻率很低的地质体 ,电阻率为 10到几十Ω·m ,可能是地壳岩浆囊。在测区范围内 ,地壳电性结构在南北方向存在着明显的横向变化 ,而东西方向相对均匀 ,变化比较平缓。
In the Changbai Mountain volcanic area and its vicinity, 6 1 earth-based electromagnetic sounding points were observed along 5 parachute lines and 1 north-west line. Observed data were processed by Robust et al. The influence of local inhomogeneities was eliminated by using impedance tensor decomposition method. The geomagnetic induction vectors reflecting the lateral lateral heterogeneity were calculated. Using RRI 2D automatic inversion and other techniques to explain the data. The results show that there is a low resistivity body in the near surface and correspond to the groundwater in Tianchi Lake, Longquan Hot Springs, Jinjiang Hot Spring and Shanmen near Changbai Mountain respectively. In the Tianchi of Changbai Mountain and its north and east areas, there are geologic bodies with very low resistivity at a depth of about 12km. The resistivity is 10 to several tens of Ω · m, probably crust magma. Within the scope of the survey area, the crustal electrical structure has a significant lateral change in the north and south directions, while the east-west direction is relatively uniform with a relatively gentle change.