Crustal structure in eastern Kazakh, U. S. S. R. from teleseismic receiver functions
Crustal structure in eastern Kazakh, U. S. S. R. from teleseismic receiver functions
复制标题
来自远震接收函数的苏联哈萨克斯坦东部地壳结构
DOI：
10.1029/gl015i006p00613
复制
发表时间：
1988
影响因子：
5.2
通讯作者：
G. Randall
中科院分区：
文献类型：
--
作者：
K. Priestley;G. Zandt;G. Randall
根据苏联哈萨克东部两个地震台站记录的地震波P波形确定的宽带接收器函数，反演了台站下方的垂直速度结构。详细的宽带接收函数是通过叠加源均衡的径向分量的双折射P波。径向接收器函数的时域反演用于确定假定由平坦的均匀层参数化的地壳模型的结构。反演结果的总体特征是：地壳浅部复杂，上地壳速度小于6 km/s，下地壳速度较高（6.9-7.5 km/s），莫霍面深度在47 ~ 57 km之间。这些结果与来自深地震测深数据的复合速度模型相比是有利的，但是显示出上地壳中的较低速度和下地壳中的较高速度。结果表明，该地区的地壳是相对均匀的，但莫霍面的性质和深度在整个地区的变化显着。哈萨克斯坦站点的接收器函数反演结构类似于加拿大地盾上一个站点的已公布接收器函数结构。
Broadband receiver functions determined from teleseismic P-waveforms recorded at two seismic stations in eastern Kazakh, U.S.S.R., are inverted for the vertical velocity structure beneath the stations. The detailed broadband receiver functions are obtained by stacking source-equalized radial components of teleseismic P-waveforms. A time-domain inversion of the radial receiver function is used to determine the structure assuming a crustal model parameterized by flat-lying, homogeneous layers. The general features of the inversion results are: a complex shallow crust, velocities less than 6 km/s in the upper crust, a high velocity (6.9-7.5 km/s) lower crust, and a Moho that varies between 47 and 57 km depth. These results compare favorably with a composite velocity model from Deep Seismic Sounding data, but show lower velocities in the upper crust, and higher velocities in the lower crust. The results indicate that the crust in this region is relatively uniform, however the nature and depth of the Moho changes significantly across the region. The receiver function inversion structure for the Kazakh sites is similar to a published receiver function structure for a site on the Canadian Shield.