极地研究

极地研究 ›› 1999, Vol. 11 ›› Issue (3): 221-227.

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南极沿167°E子午线横贯南极山脉岩石圈速度结构

束沛镒;焦丞民   

  • 出版日期:1999-09-30 发布日期:1999-09-30

LITHOSPHERE VELOCITY STRUCTURE IN TRANSANTARCTIC MOUNTAINS ALONG 167°E PRINCIPAL VERTICAL CIRCLE

  • Online:1999-09-30 Published:1999-09-30

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摘要：

依据沿大圆弧穿越南极点和斯科特站两地震台的地震瑞利面波波形资料，计算了两台之间的相速度频散，通过反演计算，获得了台间地下２００ｋｍ 岩石圈剪切波速度细结构。结果表明，横贯南极山脉地壳厚度约为４５ｋｍ ，５５～７５ｋｍ 之间存在明显低速带，它预示着这一深度有熔融的岩浆存在。

关键词: 瑞利面波;横贯南极山脉;低速带;岩浆;南极

Abstract:

This paper is based on the Rayleigh surface wave seismogram along earth's great circle across SPA and SBA seismic stations. We computed a phase velocity dispersion of Rayleigh surface wave and obtained lithosphere structure of 200km path below two stations. Our result shows that crust thickness of transantarctic mountains is 45 km. In depth of 55~75 km there are clear layers of low velocity. It displays deep fused magma.