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

使用地幔波绘制上地幔衰减的 3D 绘图

• 批准号: 9204631
• 负责人: Barbara Romanowicz
• 金额: $ 12.28万
• 依托单位: University of California-Berkeley
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-07-15 至 1994-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9204631&HistoricalAwards=false
• 关键词: Mapping; Attenuation; Upper; Mantle; Using

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.

这项研究是确定地球内地震波衰减的延续。 初步结果表明，在上地幔低Q区对应的深度范围内存在强烈的2级衰减。 通过包括过去 2 年积累的超长周期基模瑞利波数据、20 个地质观测站和几个 IRIS 站，数据收集将显着增加。 将生成地球衰减的 3D 模型，特别关注假定存在根深蒂固的衰减最大值的太平洋区域。 3D 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。