Tonga and Fiji Seismic Arrays for Investigating Slab Processes and Upper Mantle Phase Transformations

汤加和斐济地震台阵用于研究板片过程和上地幔相变

• 批准号: 0001158
• 负责人: Douglas Wiens
• 金额: $ 38.44万
• 依托单位: Washington University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-04-01 至 2005-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0001158&HistoricalAwards=false
• 关键词: Tonga; Fiji; Seismic; Arrays; Investigating

Abstract for proposal EAR0001158 (PH #51x; Spring 2000 Panel)Title: Tonga and Fiji Seismic Arrays for Investigating Slab Processes and Upper Mantle Phase TransformationsPI's: Douglas A. Wiens and Gideon Smith, Washington UniversityThe detailed structure of the Tonga subduction zone is being studied with seismic data from two dense seismic arrays. The arrays are to be deployed for about a year, one within the active island arc (Tonga), the other in the backarc environment (Fiji). Data from the arrays is used to characterize and model seismic wave propagation effects within the subducting oceanic plate and the adjacent mantle. These wave propagation effects result from interactions with seismic velocity discontinuities in and near the subducting plate. The depths, velocity contrasts, and sharpness of the velocity discontinuities will be used to help better understand the temperature, mineralogy and presence of water in the subducting slab and the surrounding mantle at greater spatial detail than is possible from data recorded teleseismically. Dense array data also allows higher precision studies of the mechanics of deep earthquakes.

EAR 0001158提案摘要（PH #51x; 2000年春季小组）标题：调查板块过程和上地幔相变的汤加和斐济地震台阵PI：道格拉斯A。维恩斯和吉迪恩史密斯，华盛顿大学汤加俯冲带的详细结构正在研究与地震数据从两个密集的地震阵列。这些阵列将部署约一年，一个在活跃的岛弧（汤加），另一个在弧后环境（斐济）。来自阵列的数据被用来描述和模拟俯冲洋板块和邻近地幔内的地震波传播效应。这些波的传播效应是由于俯冲板块内部和附近的地震速度不连续性相互作用的结果。深度，速度对比度和速度不连续性的锐度将被用来帮助更好地了解温度，矿物学和水的存在下，俯冲板和周围的地幔在更大的空间细节比可能从数据记录的地震学。密集的阵列数据还允许对深源地震的机制进行更高精度的研究。