3-D Mapping of Attenuation in the Upper Mantle Using Mantle Waves

这项研究是测定地球内部地震波衰减的继续。初步结果表明，在与上地幔低Q带相对应的深度范围内，存在较强的二级衰减。通过包括过去两年积累的20个地镜站和几个IRIS站的甚长周期基模瑞雷波数据，将显着增加数据收集。在生成地球衰减的3D模型时，将特别注意太平洋地区，在那里假定存在根深蒂固的衰减最大值。3D模型将提供关于上地幔温度和粘度分布的信息，目的是了解上地幔的对流过程。

This research is a continuation of the determination of seismic wave attenuation within the earth. Preliminary results show evidence for the existence of a strong degree 2 attenuation in the depth range corresponding to the upper mantle low Q zone. Data collection will be significantly increased by including very long period fundamental mode Rayleigh wave data accumulated in the past 2 years a 20 Geoscope stations and several IRIS stations. 3D models of attenuation for the earth will be generated with particular attention to the Pacific Ocean zone where a deep rooted attenuation maximum is postulated. The 3D models will provide information on uppermantle temperature and viscosity distributions with a goal of understanding the convective processes in the upper mantle.