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.

EAR-9909716Dueker 这项研究将解决的主要问题是：410 公里和 660 公里间断面的地形尺度长度是多少？ 这种形貌引起的散射对这些不连续性的形貌、幅度和锐度的估计有多大偏差？ 此外，当地形散射最小时，410 和 660 上的速度分布的细节是什么？ 作为一项试点研究，我们制作了来自数据最丰富的全球站点的 46,000 个径向和切向接收器函数。 为了搜索横向变化，每个站的转换后的 S 波穿透点在 410 和 660 处被分成 40 公里见方的斑块，仅研究具有 20 多个高质量接收器函数的箱。 将通过分析改变箱尺寸和频率内容的影响来研究不连续性地形散射的影响。 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。