Seismic Tomography of China and Surrounding Regions

中国及周边地区地震层析成像

• 批准号: 0001227
• 负责人: Thomas Hearn
• 金额: $ 17.02万
• 依托单位: New Mexico State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-08-01 至 2004-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0001227&HistoricalAwards=false
• 关键词: Seismic; Tomography; China; Surrounding; Regions

Hearn, Thomas M.EAR-0001227This project focuses on upper mantle structure beneath China and surrounding regions of the Asian continent. Asian tectonics is now dominated by the Indian-Asian continental collision and uplift of the Tibetan Plateau in the south and subduction along the eastern margin. Reactivated fold belts accommodate much of the deformation. These fold belts formed during the Phanerozoic amalgamation of cratonic blocks and blocks along eastern Eurasia. It is not clear, however, what the relationship of these blocks and fold belts are to their deeper mantle structure. Lithospheric thickness, collisional downwellings, and mantle anisotropy remain inadequately resolved. The tomography will use P phases from 0 to past 50 degrees distance to image the upper mantle beneath China and its surrounding regions. A key development in the tomography is the introduction of anisotropy. Previous tomographic studies show that anisotropy is essential to the problem and cannot be ignored. Anisotropic tomography has been developed and applied to the two-dimensional Pn problem. This proposal will extend anisotropic tomography to three-dimensions and apply it to the Asian data sets.

Hearn，托马斯M.赫恩-0001227本项目主要研究中国及亚洲大陆周边地区的上地幔结构。 印度-亚洲大陆碰撞和南部青藏高原的隆升以及沿着东缘的俯冲是亚洲大地构造的主要特征。 重新激活的褶皱带容纳了大部分变形。 这些褶皱带是在中生代欧亚大陆板块与沿着欧亚大陆东部板块的拼合过程中形成的。 然而，这些块体和褶皱带与它们的深部地幔结构之间的关系尚不清楚。 岩石圈厚度、碰撞沉降和地幔各向异性仍然没有得到充分的解决。 层析成像将使用0到50度距离的P相位来成像中国及其周边地区的上地幔。 层析成像的一个关键发展是引入各向异性。 以前的层析成像研究表明，各向异性是必不可少的问题，不能忽视。 发展了各向异性层析成像技术，并将其应用于二维Pn问题。 该建议将把各向异性层析成像扩展到三维，并将其应用于亚洲数据集。