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利用超导重力数据检测汶川地震激发的球型地球自由振荡
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Journal Article
利用超导重力数据检测汶川地震激发的球型地球自由振荡
2013
Overview
利用Canberra、Matsushiro、Membach和Metsahovi4个台站2008年5月的超导重力数据对汶川8．0级大地震激发的球型地球自由振荡进行了研究。结果表明，0S0～0S0全部基频振型以及1S4、2S4和3S13个谐频振型与PREM模型的误差在0．02％o～1．93，且所有振型的信噪比均大于阈值3，表明本文的计算方法是有效的，计算结果是可信的；0S2、0S3和0S4存在谱线分裂现象，其谱线分裂率R为1.09340、0.67430和1.07100，验证了地球自转和椭率是引起0S2、0S3和0S4谱线分裂的主要原因。
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