An empirical relationship between seismic attenuation and velocity anomalies in the upper mantle
An empirical relationship between seismic attenuation and velocity anomalies in the upper mantle
复制标题
上地幔地震衰减与速度异常之间的经验关系
DOI：
10.1029/1999gl005418
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发表时间：
2000
影响因子：
5.2
通讯作者：
Dapeng Zhao
中科院分区：
文献类型：
--
作者：
E. G. Roth;D. Wiens;Dapeng Zhao
我们使用汤加/斐济地区最近的P波衰减（Qα−1）和速度（Vp）层析成像模型，以获得上地幔衰减和速度之间的经验关系。衰减和速度异常表现出很强的反相关性，允许确定的经验关系。这种关系类似于橄榄岩和纯橄榄岩实验室实验得出的预测关系，假设观测到的异常是温度变化造成的。结果表明，观测到的异常与温度的影响基本一致，并表明速度和衰减数据的组合对上地幔物质的物理状态提供了强有力的约束。我们发现，所选择的地热和活化能有很大的影响固相线内的地震数据的位置。
We use recent P wave attenuation (Qα−1) and velocity (Vp) tomographic models of the Tonga/Fiji region to obtain an empirical relation between attenuation and velocity for the upper mantle. The attenuation and velocity anomalies show a strong inverse correlation, allowing the determination of an empirical relationship. The relationship is similar to a predicted relation derived from laboratory experiments on peridotite and dunite, assuming the observed anomalies result from temperature variations. The results here suggest that the observed anomalies are generally consistent with the effect of temperature, and demonstrate that the combination of velocity and attenuation data provides powerful constraints on the physical state of upper mantle materials. We find that the chosen geotherm and activation energy has a strong effect on the position of the solidus within the seismic data.
影响因子：
16.6
作者：
D. L. Anderson
通讯作者：
D. L. Anderson