南极半岛地区地震勒夫波群速度与岩石圈结构
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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。
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.
引文
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