SEISMIC ANISOTROPY ABOVE A SUBDUCTING PLATE

被引：0
|
作者：
SHIH, XR [1 ]
MEYER, RP [1 ]
SCHNEIDER, JF [1 ]
机构：
[1] ELECT POWER RES INST,PALO ALTO,CA 94303
来源：
GEOLOGY | 1991年 / 19卷 / 08期
关键词：
D O I：
10.1130/0091-7613(1991)019<0807:SAAASP>2.3.CO;2
中图分类号：
P5 [地质学];
学科分类号：
0709 ; 081803 ;
摘要：
Shear-wave splitting observed in northeastern Colombia has provided evidence of seismic anisotropy in a shear zone immediately above a subducting plate. In an upper mantle composed mainly of olivine (57%) and orthopyroxene (17%), the splitting can be interpreted by wave propagation in an anisotropic medium of orthorhombic symmetry that results from alignment of these intrinsically anisotropic minerals. The mechanism of alignment is most likely the shearing associated with the subduction, aided by fluids migrating from the subducting plate when the plate exceeds 100 km in depth.
引用
收藏
页码：807 / 810
页数：4
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