张家口-塘沽测线岩石圈有效弹性厚度研究

Research on the lithospheric effective elastic thickness under the Zhangjiakou-Tanggu survey line

岩石圈有效弹性厚度表征了岩石圈抵杭变形的能力,代表了岩石圈的综合强度,通过岩石圈有效弹性厚度的研究能揭示岩石圈丰富的热力学信息.本文收集分布在首都圈地区张家口-塘沽测线附近的16个大地热流数据,且结合该测线下的地壳结构,计算得到测线下方岩石圈的现今温度场剖面,并根据温度场计算得到其流变结构和有效弹性厚度.通过将有效弹性厚度与前人有关该测线下方震源深度的研究成果做对比,结果表明在有热流约束的地方有效弹性厚度大致对应约400-600℃的等温面,所有地震都发生在有效弹性厚度之上.

Lithospheric effective elastic thickness represents the ability of lithospheric resistance to deformation and its comprehensive strength. Abundant lithospheric thermodynamics information can be revealed through the research of the lithospheric effective elastic thickness. We collect 16 heat flow data from the Zhangjiakou-Tanggu survey line and use its crust structure to calculate its present lithosphric temperature profile. Its theological structure and effective elastic thickness can be obtained from the temperature field. We compare the effective elastic thickness with the previous result of the focus depth under the survey line. The results show that the effective elastic thickness correspond to the 400-600℃ isothermal level around the heal flow restraint zone,and all the earthquakes occur above the effective elastic thickness.