Thickness estimates of the upper-mantle transition zone from bootstrapped velocity spectrum stacks of receiver functions
Thickness estimates of the upper-mantle transition zone from bootstrapped velocity spectrum stacks of receiver functions
复制标题
从接收器函数的自举速度谱堆栈估计上地幔过渡区的厚度
DOI：
--
复制
发表时间：
1998
期刊：
影响因子：
--
通讯作者：
J. Minster
中科院分区：
文献类型：
--
作者：
H. Gurrola;J. Minster
总结我们修改的接收函数叠加技术称为速度谱叠加（VSS），以估计速度模型（VP和VS）和深度的组合，叠加的Ps转换从上地幔不连续最相干。我们发现，通过估计在深度的660和410公里的不连续性使用速度，最大化P410s和P660s阶段的叠加振幅的diVeetness，我们可以更准确地估计过渡区的厚度比这些不连续性的深度。我们给出了两个实例，表明俄罗斯奥布宁斯克下的过渡带厚度为252±6 km，而加州下的过渡带厚度仅为220±6 km。
SUMMARY We modify the receiver-functions stacking technique known as velocity spectrum stacking (VSS) so as to estimate combinations of velocity model (V P and V S ) and depth that stack the Ps conversion from upper-mantle discontinuities most coherently. We find that by estimating the diVerences in the depths to the 660 and 410 km discontinuities using velocities that maximize the stacked amplitudes of P410s and P660s phases we can estimate the thickness of the transition zone more accurately than the depths to either of these discontinuities. We present two examples indicating that the transition zone beneath Obninsk, Russia, is 252±6 km thick and that beneath Pasadena, California, is only 220±6 km thick.