Three-Dimensional Models of Subduction

俯冲的三维模型

• 批准号: 9526882
• 负责人: Richard O'Connell
• 金额: $ 18.99万
• 依托单位: Harvard University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-05-15 至 2000-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9526882&HistoricalAwards=false
• 关键词: Three; Dimensional; Models; Subduction

O'Connell 9526882 The PI proposes to model and study the development of subduction zones in the mantle. Fluid dynamical models of the sinking of subducted lithosphere in the mantle will be developed, and applied to several subduction zones including South America, Tonga-Fiji, Izu Bonin-Marianas and Indonesia. The object is to relate the dynamical, time dependent development of a subduction zone to the morphology and seismicity of the subducted slab and to the observed variations of seismic velocities in subduction zones (as revealed by seismic topography). The work will also address whether significant amounts of subducted material penetrate into the lower mantle. The work will develop and use three-dimensional dynamical models of the sinking of lithosphere at a subduction zone. The models will include the effects of lithospheric plates, including realistic plate geometries that evolve with time. Different types of models will be used in order to most efficiently address various problems.

奥康奈尔9526882国际和平研究所建议对地幔俯冲带的发展进行模拟和研究。将建立俯冲岩石圈在地幔中下沉的流体动力学模型，并将其应用于南美洲、汤加-斐济、伊祖博宁-马里亚纳斯和印度尼西亚等几个俯冲带。其目的是将俯冲带动态的、随时间变化的发展与俯冲板块的形态和地震活动以及俯冲带中观测到的地震速度变化(如地震地形图所揭示的那样)联系起来。这项工作还将解决大量俯冲物质是否穿透到下地幔的问题。这项工作将开发和使用俯冲带岩石圈下沉的三维动力学模型。这些模型将包括岩石圈板块的影响，包括随时间演变的真实板块几何形状。为了最有效地解决各种问题，将使用不同类型的模型。