SEISMIC ANISOTROPY IN THE D'' LAYER

被引：77

作者：

VINNIK, L ^{[1
]}

ROMANOWICZ, B ^{[1
]}

LESTUNFF, Y ^{[1
]}

MAKEYEVA, L ^{[1
]}

机构：

[1] INST PHYS EARTH,MOSCOW 123810,RUSSIA

来源：

GEOPHYSICAL RESEARCH LETTERS | 1995年 / 22卷 / 13期

关键词：

D O I：

10.1029/95GL01327

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

We present observations of diffracted SV (SVd) for a path between the Fiji-Tonga islands and the eastern coast of North America at distances greater than 110 degrees Observed features of S diffracted suggest that coupling between SVd and SHd can be ruled out as a first order effect for this path. Arrivals of SHd are late relative to IASP91 travel-times by about 10 s, and those of SVd are late relative to SHd by 3 s, for most records. The slope of the log(SVd/SHd) spectral ratio is around 3H z(-1) in the range 0.06-0.15 Hz. A transversely isotropic low-velocity layer in the lowermost mantle with a thickness of 200-300 km may account for most of the observed properties of SVd.

引用

页码：1657 / 1660

页数：4

共 12 条

[1]

Babuska V., 1991, SEISMIC ANISOTROPY E

[2]

CORMIER VF, 1986, B SEISMOL SOC AM, V76, P231

[3]

DOORNBOOS DJ, PHYS EARTH PLANET IN, V41, P225

[4] PRELIMINARY REFERENCE EARTH MODEL [J].