SEISMOLOGY AND GEOLOGY ›› 1996, Vol. 18 ›› Issue (4): 369-374.

• Brief Report • Previous Articles     Next Articles

JOINT GRAVITY-SEISMIC INTERPRETATION FOR YINGXIAN-ZIBO PROFILE

Liu Changquan, Fang Shengming, Li Changfa   

  1. Research Center of Exploration Geophysics, SSB, Zhengzhou 450003
  • Received:1995-06-30 Revised:1996-04-30 Online:1996-12-04 Published:2009-11-25

应县~淄博剖面重力、地震测深联合解释

刘昌铨, 方盛明, 李长法   

  1. 国家地震局地球物理勘探中心, 郑州 450003
  • 基金资助:
    地震科学联合基金资助(92072);国家地震局地球物理勘探中心科技论著(RCEG96028)

Abstract: Using 2-D velocity structure from interpretation of DSS data of Yingxian-Zibo profile we present preliminary basic model.The values of gravity anomaly are calculated and the 2-D block density distribution is inversed making use of the block 2-D body mdel of any polysonal section.The computed results show that the detachment between the upper and the middle crusts is an obvious density interface.The strong velocity gradient,i.e.the crust-mantle transition zone in the bottom of the lower crust is a high density layer and the lower-velocity block within the middle-lower crusts beneath Wutai Mt.is a lower-density block.

Key words: Two-dimensional model, Density-inteface inversion, Detachment

摘要: 利用应县~淄博地震测深解释的二维速度结构,并将速度值转换为密度值,提供初始基本模型。运用任意多边形截面的块状二度体模型计算重力异常值,反演二维块状密度分布。计算结果表明:上、中地壳之间的滑脱面是一较明显的密度界面;下地壳底部的强速度梯度层──壳幔过渡带是一高密度层;五台山下部中、下地壳内的低速度块体是低密度块体。

关键词: 二维模型, 密度界面反演, 滑脱面