从核心-地幔边界到石质层的超级羽毛:对热流的影响
Barbara Romanowicz1, Yuancheng Gung
1Seismological Laboratory, University of California, Berkeley, 215 McCone Hall, Berkeley, CA 94720, USA. barbara@seismo.berkeley.edu
Science (New York, N.Y.)
|April 20, 2002
概括
来自核心-地幔边界的两个超级羽毛影响了上层地幔结构,导致了岩层下方的水平流动. 这种现象解释了地震异常,并表明了来自地球深层内部的大量热传输.
科学领域:
- 地质物理学 地质物理学
- 地震学 地震学
- 地球科学 地球科学 地球科学
背景情况:
- 地震断层扫描揭示了核心-地幔边界的大规模热结构,称为超级羽毛.
- 了解上层地幔动力学对于板块构造学和地幔对流是至关重要的.
研究的目的:
- 为了研究上层地幔的三维无弹性结构.
- 为了确定深层地幔超级羽毛对上层地幔动态和地震特性的影响.
主要方法:
- 上层地幔无弹性结构的三维建模.
- 对地震剪切波同otropy 的分析.
主要成果:
- 来自超级羽毛的热上升持续存在于上层地幔过渡区.
- 上升的涌动在石质层下方水平偏移,在太平洋中部形成横切波同otropy.
- 超级羽毛提供稳定的热量和水平流向天气层,滑板的运动和食热点.
结论:
- 超级羽毛显著影响上层地幔流动和地震特性.
- 来自核心-地幔边界的热传输可能超过目前仅基于热点流量的估计.
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