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标题：Geographical variations of the 0 S 0 normal mode amplitude: predictions and observations after the Sumatra-Andaman earthquake
其他标题：Geographical variations of the 0 S 0 normal mode amplitude: predictions and observations after the Sumatra-Andaman earthquake
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作者：Severine Rosat ; Shingo Watada ; Tadahiro Sato 等
期刊名称：Earth, Planets and Space
电子版ISSN：1880-5981
出版年度：2007
卷号：59
期号：4
页码：307-311
DOI：10.1186/BF03353109
出版社：Springer Verlag
摘要：The radial seismic normal mode 0 S 0 was strongly excited by the 2004 Mw = 9.3 Sumatra-Andaman earthquake at a period of 20.5 min. In a spherically symmetric Earth model, 0 S 0 amplitude is the same everywhere on the Earth’s surface. However, when the ellipticity and rotation of the Earth are taken into consideration, theoretical computations predict an amplitude of 0 S 0 1% higher at the pole than at the equator. Based on a realistic three-dimensional heterogeneous rotating elliptic Earth model, our predictions indicate that the amplitude of 0 S 0 is 2% higher at the pole than at the equator. A longitude dependency of 0 S 0 amplitude is also shown. The analysis of 13 superconducting gravimeter (SG) records of the 2004 Sumatra-Andaman earthquake supports the predicted geographical variations of 0 S 0 amplitude. We have also obtained new estimates for the frequency and Q of 0 S 0 : 0.8146566±1.6 10 −6 mHz and 5506±19.
关键词：Seismic radial mode 0S0 ;superconducting gravimeter ;Sumatra-Andaman earthquake ;lateral heterogeneities