COLLABORATIVE RESEARCH: A Global Study To Constrain The Amplitude of Short-Scale Length Topography on the 410 and 660km Discontinuities

合作研究：约束 410 公里和 660 公里不连续面短尺度长度地形幅度的全球研究

• 批准号: 9909716
• 负责人: Kenneth Dueker
• 金额: $ 3.09万
• 依托单位: University of Colorado at Boulder
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-01-15 至 2000-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9909716&HistoricalAwards=false
• 关键词: COLLABORATIVE; RESEARCH; Global; Study; Constrain

EAR-9909716Dueker The primary questions of this study will address are: what are the scale lengths of topography on the 410 and 660 km discontinuity? And how much does scattering induced by this topography bias estimates of the topography, amplitude, and sharpness of these discontinuities? Also, when topographic scattering is minimal, what are the details of the velocity profiles across the 410 and 660? As a pilot study, 46,000 radial and tangential receiver functions from the most data-rich global stations were made. To search for lateral variations, the converted S-wave piercing points at each station are binned into 40 km square patches at the 410 and 660, with only bins with more than twenty high quality receiver functions being studied. The effects of discontinuity topography scattering will be studied by analyzing the effects of varying the bin size and frequency content. Preliminary analyses indicate that up to 60 km of topography on the 410 and 660 km discontinuity can be found.

本研究将解决的主要问题是：410和660 km不连续面上地形的尺度长度是多少？ 由这种地形引起的散射对地形、振幅和这些不连续性的锐度的估计有多大的偏差？ 此外，当地形散射最小时，410和660之间的速度分布的细节是什么？ 作为试点研究，从数据最丰富的全球台站获得了46，000个径向和切向接收器函数。 为了寻找横向变化，每个台站的转换S波穿透点在410和660处被分成40平方公里的块，只研究具有20个以上高质量接收器功能的块。 将通过分析不同频段大小和频率含量的影响来研究不连续地形散射的影响。 初步分析表明，在410公里和660公里的不连续面上可以找到长达60公里的地形。