SKS splitting and the seismic anisotropy of the mantle beneath the Hikurangi subduction zone, New Zealand

被引：47
作者：
Gledhill, K
Gubbins, D
机构：
[1] Department of Earth Sciences, University of Leeds, Leeds
[2] Seismological Observatory, Inst. of Geol. and Nuclear Sciences, Wellington
来源：
PHYSICS OF THE EARTH AND PLANETARY INTERIORS | 1996年 / 95卷 / 3-4期
关键词：
D O I：
10.1016/0031-9201(95)03118-9
中图分类号：
P3 [地球物理学]; P59 [地球化学];
学科分类号：
0708 ; 070902 ;
摘要：
The analysis of 12 SKS phases recorded on broadband stations above the Hikurangi subduction zone in New Zealand shows clear evidence of mantle anisotropy, with the fast direction (28 degrees +/- 5 degrees) almost parallel to the strike of subduction and the dominant geology of the region. The slow shear-wave delay times show a systematic change with the azimuth of the arrivals which, if hexagonal symmetry is assumed, indicates that either the axis of symmetry of the anisotropic volume beneath the subduction zone is not horizontal, or that more than one anisotropic layer is present. The magnitude of the delays (1.5 +/- 0.4s) suggests that the anisotropy is most probably confined to the top 300 km of the mantle.
引用
收藏
页码：227 / 236
页数：10
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