Abstract: In this paper,the authors use 3-D magnetic stratum inversion calculation to study the relief of Curie iso-geothermal surface in Bohai Sea and its abjacent regions,and along with the surface heat flow,the electrical structure of crust and upper mantle,analyze the deep seated geological characteristics.It is found that in Bohai Sea and the region from Kenli to Huanghekou in the northern part of Qiyang depression,the depths of Curie surface is only 13～20km while it reaches 22～24km at Jiao-Liao and Chengde region.The aim of our research is to Present new suggestions for the earthquake zoning and the earthquake disaster prevention.

Key words: Curie isothermal surface, Aeromagnetic survey, Frequency domain, 3-D magnetic stratum inversion calculation

摘要： 采用三维磁性层反演方法,研究了渤海及周边地区的居里等温面起伏。结合地表热流值、地壳厚度及地壳上地幔的电性结构,分析了研究区的深部地质特征。发现渤海及济阳坳陷北部的垦利至黄河口地区,居里面的深度只有13～20km,而胶辽和承德地区却深达22～24km.该项研究旨在对地震区划的深部构造背景问题提出新的建议。

关键词: 居里等温面, 航磁测量, 频率域, 三维磁性层反演