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

这项研究是地球内部地震波衰减测定的延续。初步结果表明，在上地幔低Q带对应的深度范围内存在较强的2度衰减。通过包括过去两年中20个Geoscope站点和几个IRIS站点积累的超长周期基模瑞利波数据，数据收集将大大增加。将生成地球衰减的三维模型，特别注意太平洋地区，在那里假定深根衰减最大值。三维模型将提供有关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.