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在日光火山区收集了周期为0.01～10s范围的大地电磁(MT)测深数据。阻抗数据沿区域走向N0°E进行分解,利用含有静态漂移作为模型参数的二维反演进行分析解释。模型的主要特点是:(1)南部8km深的良导体与地震S波反射体一致;(2)北部5km深的良导体与地震波衰减带一致;(3)中间的高阻带与航磁数据推断的磁性体一致。两个良导体可能表示在400℃左右的圈闭游离水。中间高阻体表示火山体,火山体侵入地壳可能破坏圈闭游离水的状态。
Magnetotelluric (MT) sounding data with a period in the range of 0.01 ~ 10s were collected in Nikko volcanic area. The impedance data is decomposed along the area towards N0 ° E, and analyzed and interpreted using two-dimensional inversion with static drift as a model parameter. The main features of the model are: (1) the good conductor in the south of 8km is consistent with the S-wave reflector of the earthquake; (2) the good conductor of 5km in the north is consistent with the attenuation band of the seismic wave; (3) Inferred magnetic body consistent. Two good conductors may represent trapped free water at about 400 ° C. The middle high-resistivity body represents a volcano, and a volcanic body invades the earth’s crust may damage the state of trapped free water.