Basement structure and yalu river fault belt in Dandong region

Some geophysical surveying works in the northeast part of Dandong, such as shallow shock refracted wave, electrical prospecting, electrical sounding and wave velocity measuring, are introduced in this paper, and the dynamic parameters are calculated. The results show that the basement structure in surveying region is very complex, the overburden thickness of the quaternary period, velocity distribution and dynamic parameters are of regional characteristics. The depth of basement is deep in the north and shallow in the west, the difference between north and west region is about 5–10 m. The south part of Yalu river fault belt is composed of F₁, F₂, F₃, F₄, F₅ fault, their strike direction is NE, we can determine that the F₂ fault is the main one in Yalu river fault belt, and the south part of Yalu river fault belt has no activity since Holocene Epoch. The Chinese version of this paper appeared in the Chinese edition ofActa Seismologica Sinica,15, 282–288, 1993.