Abstract：Research purposes:Lhasa to Linzhi section of Sichuan-Tibet Railway is located in the alpine mountain canyon area. The length of tunnel is 53 % for the total length of line. Due to drilling difficulties for deep tunnel， a lot of work about the natural field audio frequency magnetotelluric method(AMT)has carried out for tunnel prospecting. Suture zone is the product of Tibet's special geological structure，and the suture zone is interpreted directly by the engineering geophysical data with rare public literature at home and abroad. Therefore，under the existing logistics system，in the face of difficult and hypoxia，low temperature and other special environment under the premise of guaranteeing as much as possible to collect effective information，this geophysical prospecting discusses the limit of ground elevation for geophysical prospecting work area，researches the corresponding relation and regularity between audio frequency magnetotelluric data and suture zone，is to provide technical support and reference for the geophysical prospecting on Kangding to Linzhi section of Sichuan-Tibet Railway in future，which the most complex topographic and geological conditions in the world.
Research conclusions:(1)Data collection:The difference of data collection for geophysical exploration between Lhasa to Linzhi section and general areas is very big，geophysical workers face the great difficulties such as environment of hypoxia，low temperature along the steep terrain，a footraee with heavy armor, instruments and supplies of tunnel ground walking. Therefore in the steep terrain and extremely difficult location where the ground elevation is more than 4 500 m， the existing system of logistics supplies condition cannot ensure the safety of the personnel, it is difficult to collect the geophysical data，so there would be a lot of data blank. ( 2)Data processing and interpretation:There is no difference between Lhasa to Linzhi section and general areas.(3)In the inverted resistivity profile，the positions where low resistivity of strip that goes downward is abnormal or there is gradient high value correspond to the suture zone. ( 4)The research results can be used for other alpine region on engineering geophysical exploration.
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2015, Vol. 32 
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