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

我们的目标是利用卫星（GOCE）、航空（HALO）和地面重力数据解释南美和中美洲俯冲带以及克里特岛地区的活动辐合板块边界的三维密度和动态结构。基于GOCE重力、重力梯度和不变量的密度、动力和弯曲刚度模型将为岩石圈结构的解释、沿板块界面应变积累的局部化和地震矩释放高区圈定提供新的维度。这些目标将通过(1)稳健的数据处理来实现，这使得GOCE重力和重力梯度适合于地球物理建模；(2)对俯冲和覆盖板块之间的相互作用进行良好的约束地球动力学建模。利用IGMAS+和ABAQUS FE软件实现三维静态和动态建模。地热条件和板块构造分割对板块地震震级的影响尚不清楚。将尝试找出地震发生和地球动力过程的控制因素。此外，基于重力异常分析了海沟平行地壳厚度变化对俯冲样式和地震分布的影响。这些研究领域一直是各种项目（IPOC -智利综合板块观测站；SFB 526 -地球流变学；HALO和GOCE/ESA任务）研究兴趣的主题，因此地质和地球物理限制都得到了很好的记录。我们已经与这些项目以及SPP内涉及岩石圈和地幔建模（CASE、IDEM、VILMA）和GOCE数据处理（IMPLY）的项目产生了协同作用。

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).