地球物理学进展 ›› 2013, Vol. 28 ›› Issue (1): 207-213.doi: 10.6038/pg20130122

• 空间与固体地球物理 • 上一篇    下一篇

东大别山构造带六安-英山地磁剖面观测与地震研究

张毅, 陈宇卫, 黄显良, 顾春雷, 徐如刚, 余勇, 王雷   

  1. 安徽省地震局, 合肥 230031
  • 收稿日期:2012-09-15 修回日期:2012-11-10 出版日期:2013-02-20 发布日期:2013-02-20
  • 作者简介:张毅,男,1964年生,安徽萧县人,高级工程师,主要从事地震监测、分析工作.(E-mail:aegc@163.com)
  • 基金资助:
    中国综合地球物理场观测-鄂尔多斯地块周缘地区项目(201208009)资助.

The surveying of LuAn-YingShan geomagnetic profile and earthquake research in eastern Dabie orogen

ZHANG Yi, CHEN Yu-wei, HUANG Xian-liang, GU Chun-lei, XU Ru-gang, YU Yong, WANG Lei   

  1. Earthquake Administration of Anhui Province, Hefei 230031, China
  • Received:2012-09-15 Revised:2012-11-10 Online:2013-02-20 Published:2013-02-20

摘要: 本文以东大别构造带内六安—英山地磁剖面磁异常数据为基础,结合研究区域地质学和地震学研究成果,反演给出研究区域居里面埋深及地下介质磁性结构模型.通过对磁异常变化特征曲线、介质磁性结构模型分析发现:东大别构造带北部磁异常较强且波动较大、地下磁性结构特征相对复杂,北淮阳地区磁异常较弱、地下介质结构成叠瓦状形态分布,合肥盆地磁异常曲线变化平缓、埋深较深,为连续均匀的磁性基底,结果较好地反应了合肥盆地、北淮阳、东大别构造带北部之间的差异;"霍山地震窗"地壳下方6~12 km处存在显著地磁性差异,结合东大别构造带内70年代以来地震和历史强震,对"霍山地震窗"地震活动性与地下构造、场源关系进行了研究,初步探讨了其动力学成因.

Abstract: In this paper, based on the geomagnetic survey line from LuAn to YingShan in the Eastern Dabie Orogen, the geomagnetic anomaly are picked up. Assisted by the geology and seismology results, the depth of Curie surface was inverted, and the model of subsurface magnetic structure was built. According to analyzing the curve of the magnetic anomaly and magnetic structure model, it was found that the results reflect strongly the differences among the Hefei Basin, North Huaiyang area, and Eastern Dabie Orogen. In the Eastern Dabie Orogen, the magnetic structure is complex, related to the strong and undulate geomagnetic curve. In the North Huaiyang area, it shows that the geomagnetic structure is imbricate with the weak magnetic anomalies curve. And in the Hefei Basin, the basement appears deeply buried, continuous and uniform, leading to the flat magnetic anomalies curve. Simultaneously, a significant difference of magnetic properties in the area from 6 to 12 km depth in the Huoshan region is noticed. Combined with the earthquake from 1970 and strong historical earthquake, the connection of the seismicity of HuoShan seismic window with the underground structure and field resource is studied, and the dynamic causes of HouShan seismic window is discussed preliminarily.

中图分类号: