Anomalously low amplitude of S waves produced by the 3D structures in the lower mantle
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- 作者：Akiko Toa ; ato@jamstec.go.jp" class="auth_mail" title="E-mail the corresponding author ; Yann Capdevilleb ; Barbara Romanowiczc ; d ; e
- 关键词：Seismic wave propagation ; ULVZ ; LLSVP ; Core-mantle boundary ; Amplitude anomaly ; Spectral element method
- 刊名：Physics of the Earth and Planetary Interiors
- 出版年：2016
- 出版时间：July 2016
- 年：2016
- 卷：256
- 期：Complete
- 页码：26-36
- 全文大小：3381 K
文摘
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S and Sdiff waves with anomalously low amplitude are observed.
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Defocusing effect of low Vs structures at the base of the mantle is likely the cause.
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The previously proposed thin UVLZ partially explains the amplitude anomalies.
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A large low Vs region placed adjacent to ULVZ contributes to explain observations.
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Amplitude anomalies are useful measurements to constrain the 3D slow structure.