结合GRACE和GPS观测资料研究苏门答腊区域的黏滞性结构

项目名称： 结合GRACE和GPS观测资料研究苏门答腊区域的黏滞性结构

项目编号： No.41274098

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 天文学、地球科学

项目作者： 王武星

作者单位： 中国地震局地震预测研究所

项目金额： 80万元

中文摘要： 流变结构对于岩石圈的变形、俯冲带的应变积累和应力释放与传播等有很大的影响，在地球动力学数值模拟研究中，对黏滞系数合理的估计是取得可靠科学结果的基础。随着空间技术的发展，利用多种空间对地观测技术的观测结果来研究同一个科学问题已经成为科学研究发展的趋势。本申请项目拟利用GRACE和GPS 等观测资料，结合区域构造、地壳运动和变形背景，研究苏门答腊大地震引起的变形场及其衰减过程，给出描述模型；通过黏弹性球形地球位错理论，利用震后下地壳和上地幔黏弹性松弛过程中的形变与重力效应来反演区域黏滞性结构，为更加准确、可靠地认识区域黏滞性结构探索新的线索和方法，并为认识该俯冲带的应变积累和应力释放机制，讨论苏门答腊Mw9.3地震对中国大陆地壳运动和质量变化等的影响提供参考。

中文关键词： GRACE；GPS；苏门答腊和日本地震；震后变形；区域黏滞系数

英文摘要： The rheological structure has significant influence on lithosphere deformation, stress accumulation, release and dissemination on subduction zone. Evaluation of the lithosphere viscosity is the primary task for the numerical simulation in geodynamics; it is fundamental to obtaining reliable scientific results. With the development of space technology, the use of observations of a variety of space observation techniques to study a same scientific problem has become the trend of scientific research and development. This research proposal aims at the characterization of deformation and its relaxation caused by the Mw9.3 Sumatra Earthquake. Both of the observations from GRACE and GPS will be used in combination with the backgrounds of regional tectonic, crustal movement and deformation. Based on the post-seismic deformation and gravity change detected by GPS and GRACE, the viscous lithospheric structure of the Sumatra area is investigated with a spheric, viscoelastic earth,dislocation model. To understand the regional viscosity structure more accurate and reliable, new clues and methods are explored in this research. And this research is helpful for understanding the mechanism of stress accumulation and release on subduction zone, also can provide references for discussing the effects of the Sumatra earthquake on cr

英文关键词： GRACE；GPS；Sumatra and Japan Earthquakes；Post-seismic deformation；regional viscosity