DISCUSSION ON THE APPLICATION OF HIGH DENSITY RESISTIVITY METHOD IN GEOLOGICAL SURVEY ON LAVA PLATFORM

Wudalianchi volcanic clusters is in a triangle region that is composed of Daxing'an Mountains uplift, Xiaoxing'an Mountains uplift and Songliao Depression.The margin of the triangle region is surrounded by three faults, NW-trending Nenjiang fault on its west side, NE-trending Sunwu Graben on its east side and EW-trending Nemoer fault on its south side.Located on a lava platform, the Wudalianchi volcanic clusters is composed of 14 volcanic cones with their 800km² coulee on wavy plain, Yaoquanshan Volcano, Wohushan Volcano, Bijiashan Volcano, Nangelaqiushan Volcano, Beigelaqiushan Volcano, Dongjiaodebushan Volcano, Xijiaodebushan Volcano, Donglongmenshan Volcano, Xi longmenshan Volcano, Yingbeishan Volcano, Molabushan Volcano, Weishan Volcano, Laoheishan Volcano and Huoshao Volcano, two of them, The Laoheishan Volcano and the Huoshaoshan Volcano had erupted during 1 719~1 721.As a new geophysical methods introduced in recent years, High-density method is widely used in geological survey and engineering investigation and can have a better geological effects in investigating of lava platform thickness, lava tunnels, lava underlying strata, fault development and so on.