| 南极半岛地区地震勒夫波群速度与岩石圈结构 |
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| 引用本文： | 束沛镒,胡家富,滕吉文,张中杰,焦丞民.南极半岛地区地震勒夫波群速度与岩石圈结构[J].极地研究,1996,8(2):45-48. |
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| 作者姓名： | 束沛镒 胡家富 滕吉文 张中杰 焦丞民 |
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| 作者单位： | 中国科学院地球物理研究所，云南大学，中国科学院地球物理研究所 |
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| 摘 要： | 本文依据南极智利贝纳尔多奥伊金斯将军站的来自南桑德韦奇群岛的Ｍｓ＝６．４级地震面波资料，采用最新的适配滤波频时分析技术和网格频散反演方法，计算了南极半岛地区的勒夫波群速度频散，并获得了该区岩石圈结构模型。结果表明，西南极南极半岛地区地壳为成层结构，可分为三层，其分层厚度分别为５ｋｍ、８ｋｍ和１０ｋｍ。地壳厚度为２３ｋｍ，上地幔顶部速度为５．３２ｋｍ／ｓ。在深度５３ｋｍ以下，地幔介质中速度逐步降低为５．１１ｋｍ／ｓ和４．９ｋｍ／ｓ，最低值达４．８ｋｍ／ｓ，可以推断南极地幔亦为成层结构。
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| 关 键 词： | 南极半岛 勒夫波 适配滤波频时分析 网格频散反演 |
A GROUP VELOCITY OF SEISMIC LOVE SURFACE WAVE AND LITHOSPHERE STRUCTURE IN ANTARCTIC PENINSULA |
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| Shu Peiyi.A GROUP VELOCITY OF SEISMIC LOVE SURFACE WAVE AND LITHOSPHERE STRUCTURE IN ANTARCTIC PENINSULA[J].Chinese Journal of Polar Research,1996,8(2):45-48. |
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| Authors: | Shu Peiyi |
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| Abstract: | This paper is based on the surface wave seismogram of South Sandwich Island earthquake(Ms=6.4) recorded by Antarctic General Bernardo O'Higgins Station. We computed a group velocity dispersion of Love surface wave and obtained lithosphere structure by appling the matched filter frequancy time analysis and the grid dispersion inversion.Our result shows that crust structure below Antarctic Peninsula may be divided into three layers and their thicknesses are respectively 5km,8km and 10km. Upper mantle velocity is 5.32km/s and gradually changes into 5.11km/s-4.9km/s below 53km.The minimum velocity is 4.8km/s. It can be infered that Antarctic mantle is also a layer structure. |
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| Keywords: | s Antarctic Peninsula Love surface wave the matched filter frequancy time analysis the grid dispersion inversion |
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