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1980年至1984年间,在辽东地区和海城地震区,我们利用地质,冶金和化工部门的一批勘探钻孔,观测了这些井孔不同深度的温度,获得了它们沿深度方向的温度梯度,同时,由这些观测孔取得岩样,在实验室中测定它们的岩石热导率,从而得到每个钻孔的热流值这些热流值可粗略地给出海城地震区和辽东地区的热结构。结果表明:平行郯庐断裂的辽阳一熊岳北东条带具有相对高的热流值,平均热流为2.0微卡每平方厘米秒,这个条带恰好是下辽河盆地和辽东山地的交界,它与重力异常梯度带显示的北东向上地慢降起带一致。海城地震区的平均热流值达2.3微卡每平方厘米秒,又是高热流值条带上最高的区域。比较海城地震区已知的其它地球物理资料后,给出了该地区地球物理资料的综合解释剖面。我们推测,海城地震区下地壳中的低速层是由于上地慢物质的大规模侵入产生的。高温和低速意味着该层具有塑性力学性质,海城地震震源区恰好位于这样一个塑性状态的介质层上部。
From 1980 to 1984, in the Liaodong area and Haicheng earthquake area, we used a group of exploration bores in the geological, metallurgical and chemical sectors to observe the temperature at different depths of these boreholes and obtained their temperature gradients along the depth direction. At the same time, rock samples were taken from these observation holes, and their thermal conductivity of rocks was measured in the laboratory to get the heat flow value of each borehole. These heat flow values can roughly give the thermal structure of Haicheng earthquake area and Liaodong area. The results show that the northeast-east Liaoyang-Xiong Yue strip parallel to the Tan-Lu fault has a relatively high heat flow value with an average heat flux of 2.0 micro-cats per square centimeter. This strip happens to be at the junction of the Lower Liaohe Basin and Liaodong Mountain, The north-east gradient of the gradient band shows a slow drop band. Haicheng earthquake area average heat flow value of 2.3 micro-cards per square centimeter seconds, but also the highest heat flow strip on the highest area. After comparing other known geophysical data in Haicheng earthquake area, a comprehensive interpretation profile of geophysical data in this area is given. We hypothesize that the low velocity layer in the lower crust of the Haicheng earthquake area is due to the large-scale invasion of slow materials from the upper Earth. The high temperature and low velocity mean that the layer has plasticity and mechanical properties. The Haicheng earthquake focal zone is just above the plastic layer.