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首页> 外文期刊>Physics of the Earth and Planetary Interiors: A Journal Devoted to Obsevational and Experimerntal Studies of the Chemistry and Physics of Planetary Interiors and Their Theoretical Interpretation >Seismic attenuation in a phase change coexistence loop
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Seismic attenuation in a phase change coexistence loop

机译：相变共存回路中的地震衰减

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摘要

Most phase transformations in the mantle occur across regions of multi-phase coexistence. Inside these regions, the long-term incompressibility becomes very low because the density can increase both by compression and by changing phase. This difference between long-term and elastic incompressibilities is a typical situation where seismic attenuation may happen. In this paper, we discuss the various differences between the classical theory of sound attenuation in a reacting fluid and the case of seismic propagation in a two-phase loop. We derive a simple analytical model of a two-phase loop to show that the phase change should affect both the bulk and the shear attenuation and in rather similar proportion. We show that attenuation occurs over two different frequency ranges. For the olivine-wadsleyite phase change, the low frequency attenuation occurs for periods larger than hundreds of years but the high frequency band occurs between 1 min and 1 h (from 16 to 0.27 mHz) in the domain of surface waves and seismic modes. We predict both bulk and shear quality factors between I and 10 in the middle of the 410km phase loop.
机译：地幔中的大多数相变发生在多相共存区域之间。在这些区域内，长期不可压缩性变得很低，因为密度可以通过压缩和改变相而增加。长期不可压缩性与弹性不可压缩性之间的这种差异是地震衰减可能发生的典型情况。在本文中，我们讨论了在反应流体中的经典声衰减理论与在两相回路中的地震传播情况之间的各种差异。我们推导了一个简单的两相环路分析模型，表明相变应该以相似的比例影响体积和剪切衰减。我们表明，衰减发生在两个不同的频率范围内。对于橄榄石-辉石岩的相变，低频衰减发生的时间大于数百年，而高频频带发生在表面波和地震模式的1分钟至1小时（从16到0.27 mHz）之间。我们预测了410km相环中部的体积质量因数和剪切质量因数在10与10之间。

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