关键词: 火山, 大地电磁测深, 电阻率, 阻抗张量, 岩浆囊

Abstract: Observations by magnetotelluric technique have been carried out at 15 sites along two profiles in Tianchi volcano area of Changbaishan Mountain northeast China. The impedance tensor decomposition and a new two-dimensional inversion method (RRI) are used for data analysis and interpretation. The results show that the conductivity structure beneath the volcano and its neighbouring area is of two-dimensional character and a local three-dimensional low resistivity body exists at depth of about 12km under the volcano. It is inferred that this anomaly body may be a magma chamber.