Slab configuration beneath the Hellenides by combined teleseismic and local earthquake P-wave tomography – Implications for subduction dynamics, plate motion and deformation

通过远震和局部地震 P 波层析成像相结合得出的 Hellenides 下方的板片结构 â 对俯冲动力学、板块运动和变形的影响

• 批准号: 498815078
• 负责人: Professorin Dr. Eline Le Breton
• 金额: --
• 依托单位: Fachrichtung Tektonik und Sedimentäre Geologie
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/498815078?language=en
• 关键词: Slab; configuration; beneath; Hellenides; combined

The south-eastern margin of the Adriatic plate plays a decisive role for the tectonic evolution of the entire Mediterranean area. At its southern end, the oldest oceanic lithosphere in the world is consumed in the Hellenic subduction zone. Strong rollback of the Hellenic slab presumably influences the motion of the entire Adriatic plate and the broad deformation of the Balkan peninsula. Further north, the tectonic style changes to continental subduction/collision and is probably accompanied by tearing and break-off of the previously subducted lithosphere. The overriding European lithosphere is widely deformed and exhibits the highest seismic hazard in Europe. Despite its geophysical significance, the area is much less well studied than the Alps and the Apennines and, therefore, first-order questions regarding slab configuration and geometry are still highly debated. Based on seismic data from existing networks supplemented by mobile broadband stations deployed in the area during the project to attain a dense and even coverage, we aim to apply a combination of teleseismic and local earthquake P-wave tomography to obtain high-resolution images of mantle structure beneath the area. Together with a compilation of kinematic reconstructions since Mesozoic time and 3D geodynamic modelling of the Alpine-Mediterranean area, these images will allow us to gain new insights into subduction dynamics and the drivers of plate motion and deformation in this region.

亚得里亚海板块的东南边缘对整个地中海地区的构造演化起着决定性的作用。在它的南端，世界上最古老的海洋岩石圈在希腊俯冲带被消耗。希腊板块的强烈回滚可能影响整个亚得里亚海板块的运动和巴尔干半岛的半岛的广泛变形。进一步向北，构造样式转变为大陆俯冲/碰撞，可能伴随着先前俯冲的岩石圈的撕裂和断裂。欧洲大陆岩石圈变形严重，是欧洲地震危险性最高的地区。尽管它的地球物理意义，该地区是少得多的研究比阿尔卑斯山和亚平宁山脉，因此，一阶问题板配置和几何形状仍然高度争论。基于现有台网的地震数据，并辅以项目期间在该地区部署的移动的宽带台站，以实现密集和均匀的覆盖，我们的目标是应用地震层析成像和当地地震P波层析成像相结合，以获得该地区下地幔结构的高分辨率图像。连同自中生代以来的运动学重建汇编和阿尔卑斯-地中海地区的3D地球动力学建模，这些图像将使我们能够对俯冲动力学以及该地区板块运动和变形的驱动因素获得新的见解。