The Use of Broadband Body Waves to Investigate the Upper Mantle Structure Beneath the Tibetan Plateau, Tarim Basin and the Tien Shan

利用宽带体波研究青藏高原、塔里木盆地和天山下的上地幔结构

• 批准号: 8916276
• 负责人: Terry Wallace
• 金额: $ 3.52万
• 依托单位: University of Arizona
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-03-01 至 1991-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8916276&HistoricalAwards=false
• 关键词: Use; Broadband; Body; Waves; Investigate

This research is to study the detail of the uppermost mantle beneath the Tibetan Plateau, the Tarim Basin and the Tien Shan using broadband, regional distance body waves. The details of the upper mantle lid, such as depth to the low-velocity zone, velocity gradient below the Moho and the lateral variability of the lid, can provide very important constraints on the dynamics of the uplift of the Tibetan Plateau. Preliminary work based on long-period body waves has shown that they can be used to constrain the velocity gradient beneath the Moho and depth to the low-velocity zone. This work will analyze the regional phases of earthquakes which have crossed the plateau and surrounding regions as recorded on the broadband Chinese Digital Seismic Network. Although the network has only been operational since mid-1986, the broadband nature of the recording allows modeling which has not been possible before. Because this involves the structure of an active seismic area, the work is a component of the National Earthquake Hazard Reduction Program.

这项研究是为了研究上地幔的细节 在青藏高原、塔里木盆地和天山之下 使用宽带、区域距离体波。 的细节 上地幔盖，如低速带的深度， 莫霍面以下的速度梯度和 盖子可以对动力学提供非常重要的约束 青藏高原的隆起。 初步工作基于 长周期体波已经表明，它们可以用来 将莫霍面下的速度梯度和深度限制在 低速带 这项工作将分析区域阶段， 穿越高原和周边地区的地震 中国宽带数字地震记录区 网络 尽管该网络自2000年以来才开始运作， 1986年年中，记录的宽带特性允许建模 这在以前是不可能的。因为这涉及到 一个活跃的地震区的结构，这项工作是一个组成部分， 国家地震减灾计划。