Pg回折波的上地壳三维层析成象  

3-D Tomographic Determination of Uppermost Crust Using Pg Diving Wave

作　　者：赖晓玲[1] 张先康[1] 杨玉春[1] 杨健[1] 

机构地区：[1]国家地震局地球物理勘探中心

出　　处：《华北地震科学》1996年第3期10-19,共10页North China Earthquake Sciences

摘　　要：提出利用人工地震Ｐｇ回折波走时重建区域上地壳三维速度分布的方法。正问题利用经典最小二乘迭代求解垂向速度梯度模型的参数值及相应走时残差。反问题采用泛函空间的最小二乘准则来实现。对速度不需要预先进行参数化处理，可以计算反演区内任意点的速度值。数值计算结果表明了该方法的可靠性。处理了滦县地震区人工地震Ｐｇ走时资料，获得了该区上地壳顶部的三维速度分布。In this paper a method,reconstructing three dimensional local velocity distribution of uppermost crust using Pg diving wave generated by explosions, is proposed.The forward problem is calculated using least-square iteration technique to obtain model parameters with vertical velocity gradient and travel-time residuals.The inverse problem is solved based on Least-squares criteria in functional space.It is not necessary to parameterize velocity model ahead in our method.The velocity at any point in model space cna be estimated.In this paper the observed Pg data in Luanxian seismic region have been treated and the 3-D velocity distribution of the uppermost crust in this region has also been reconstructed.

关 键 词：走时残差 P波 地震波 CT 成像 地震勘探 

分 类 号：P631.44[天文地球—地质矿产勘探]