中朝地台东北缘3km深度地震层析成像的地质解释

GEOLOGIC INTERPRETATION OF SEISMIC TOMOGRAPHIC IMAGE 3 KM DEPTH IN THE NORTHEAST EDGE OF SINO-KOREAN PLATFORM

利用本区丰富的地质、人工地震探测资料，对３ｋｍ深度层析成象成果进行分析对比，结果表明：①３ｋｍ深度速度值与人工地震探测所获地震波速值吻合较好；②３ｋｍ深度速度分布与该深度处的岩石介质分市有较好的对应关系，高速区对应地层主要为太古界－下无古界变质岩和地槽区的古生界浅变质岩，低速区对应地层主要为中生界火山、碎屑岩，燕山或花岗岩体和盖层性质的中元古－古生界沉积岩；③层析成象结果可为划分深度不同的岩石单元，进而分析一定深度的古地貌以及较大的构造单元提供依据。

Using rich geological and man-made seismic sounding data. the authors make a interpretationseismic tomographic image 3 km deep in the northeast edge of Sino-Korean platform. The results show that: 1. Thevelocity of 3km seismic tomographic image 3 km deep cosincide with the velocity of man-made seismic sounding.2. The velocity image of seismic tomographic inversion correspond good with the rock medium distribution at thesame depth : The high velocity area corresponds good with the medium distribution at same depth. The high velocityarea corrrespound with Archaeozoic-Lower Proterozoic Erathem metamorphic rocks and Palaeozoic Erathemmiddle-lower metamophic rocks of geosyncline. The Lower velocity area corresponds with Mesozoic Erathemvolcanic-clastic rock. Yanshanian Stage granite hody and Middle Proterozoic-Palaeozoic Erathem sedimentaryrocks as cover.3. The results of seismic tomographic image can provide basis for dividing rock unit of differentdepth and analysing a certain depth paleogeomophic face as wellas some structure unit.