Integrated MOdelling of Satellite and Airborne Gravity data of Active plate margins

活动板块边缘卫星和机载重力数据的集成建模

• 批准号: 111515486
• 负责人: Professor Dr. Hans-Jürgen Götze
• 金额: --
• 依托单位: Institut für Geowissenschaften
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2009
• 资助国家: 德国
• 起止时间: 2008-12-31 至 2013-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/111515486?language=en
• 关键词: Integrated; MOdelling; Satellite; Airborne; Gravity

We aim to interpret the 3D density and dynamic structure of active convergent plate boundaries of the South and Central American subduction zones as well as the Crete regions using satellite (GOCE), airborne (HALO) and terrestrial gravity data. The density, dynamic and flexural rigidity models based on GOCE gravity, gravity gradients and invariants will add new dimension to the interpretation of lithospheric structure, localization of strain accumulation along plate interface and delineation of regions of high seismic moment release. These objectives will be achieved using (1) robust data processing which makes GOCE gravity and gravity gradients suitable for geophysical modelling and (2) well constrained geodynamic modelling of the interaction between the subducting and overriding plates. The 3D static and dynamic modelling will be realized using IGMAS+ and ABAQUS FE software. The influence of geothermic condition and structural segmentation of plates on the magnitude of slab-related earthquakes is not well understood. An attempt will be made to figure out the controlling factors for earthquake occurrences and geodynamic processes. Moreover, the influence of the trench parallel crustal thickness variations on the style of subduction and earthquake distributions will be analysed based on gravity anomalies. The study areas have been the subject of research interest for various projects (IPOC - Integrated Plate Observatory Chile; SFB 526 - Rheology of the Earth; HALO and GOCE/ESA missions) and as a result both geological and geophysical constraints are well documented. We already have synergy with those projects as well as with projects within SPP involved in lithospheric and mantle modelling (CASE, IDEM, VILMA) and GOCE data processing (IMPLY).

我们的目标是解释三维密度和动态结构的活动会聚板块边界的南美洲和中美洲俯冲带以及克里特岛地区使用卫星（GOCE），航空（HALO）和陆地重力数据。基于GOCE重力、重力梯度和不变量的密度、动力学和抗弯刚度模型将为解释岩石圈结构、应变积累沿着板间界面的局部化和高地震矩释放区的划分增添新的维度。这些目标将通过以下方式实现：（1）使GOCE重力和重力梯度适合于地球物理建模的可靠数据处理;（2）对俯冲板块和覆盖板块之间的相互作用进行约束良好的地球动力学建模。采用IGMAS+和ABAQUS有限元软件进行三维静动态建模。地热条件和板块的结构分割对板块相关地震震级的影响还没有得到很好的理解。试图找出地震发生和地球动力学过程的控制因素。此外，还将根据重力异常分析海沟平行地壳厚度变化对俯冲方式和地震分布的影响。这些研究区域一直是各种项目（IPOC -智利综合板块观测站; SFB 526 -地球流变学; HALO和GOCE/欧空局飞行任务）的研究兴趣主题，因此，地质和地球物理方面的制约因素都有详细记录。我们已经与这些项目以及SPP内部涉及岩石圈和地幔建模（CASE，IDEM，VILMA）和GOCE数据处理（IMPERT）的项目产生了协同作用。