Global Attenuation Model of the Whole Mantle Using Waveform Tomography

使用波形断层扫描的整个地幔的全局衰减模型

• 批准号: 9706380
• 负责人: Barbara Romanowicz
• 金额: $ 14万
• 依托单位: University of California-Berkeley
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-11-15 至 1999-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9706380&HistoricalAwards=false
• 关键词: Global; Attenuation; Model; Whole; Mantle

9706380 Romanowicz This research is to resolve lateral variations in attenuation in the earth's mantle, which can help improve our understanding of the character of upwellings in the general mantle circulation. In recent work, a 3D model of shear attenuation in the upper mantle was developed, based on fundamental mode surface wave data in the spectral domain. The lateral resolution in this model is equivalent to that of a degree 6 spherical harmonics expansion. A new formalism developed for waveform inversion of surface wave and body wave seismograms was applied to obtain a degree 12 SH velocity model of the whole mantle. This work involves extending the waveform formalism to include off- great-circle path propagation and inverting for anelastic structure in the time domain. This will allow a deeper probing into the mantle using body wave information and eventually increase the lateral resolution of the Q models. ***

小行星9706380 本项研究的目的是解决地幔衰减的横向变化，这将有助于提高我们对地幔环流中隆升特征的认识。在最近的工作中，在上地幔剪切衰减的3D模型的基础上，在频谱域的基模面波数据。 在这个模型中的横向分辨率相当于6度球谐展开。 本文应用一种新的面波和体波波形反演方法，得到了全地幔12阶SH速度模型。 这项工作涉及扩展波形形式主义，包括在时域中的滞弹性结构的非大圆路径传播和反演。 这将允许使用体波信息对地幔进行更深入的探测，并最终提高Q模型的横向分辨率。 ***