Identifying Main Lithospheric Structures in the Eastern Alpine Domain by Joint Inversion of Receiver Function and Surface Wave Measurements for Seismic Anisotropy

接收函数与地震各向异性面波测量联合反演识别东部高山域主要岩石圈结构

• 批准号: 442515292
• 负责人: Professor Dr. Mark R. Handy
• 金额: --
• 依托单位: Fachrichtung Geophysik
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2020
• 资助国家: 德国
• 起止时间: 2019-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/442515292?language=en
• 关键词: Identifying; Main; Lithospheric; Structures; Eastern

Mountain building in the Alps started in the Neogene when crustal units derived from Eurasia, inter-vening oceanic basins and microcontinents got strongly deformed and folded by the approaching Adriatic intender. The eastern Alps are ideally suited to study the full complexity of mountain building including crustal delamination and deformation, nappe stacking and lateral escape. The underlying processes and in particular the driving forces remain enigmatic, however, because the crustal and deep lithospheric structure in the eastern Alpine domain are still poorly resolved. A pre-requisite for the understanding of mountain building processes since the Neogene in the eastern Alps is the identification of the shape of the intender and of the decoupling horizon for the lateral escape north of the suture as well as the clarification of the deep lithospheric structure. It re-mains an open question if Adria or Eurasia are the upper plate or if mountain building is the result of bivergent subduction. Also, properties of the mantle lithosphere need to be resolved as they are key for the quantification of tectonic forces causing collision and mountain building. AlpArray – the densest regional seismic array ever deployed contemporaneously - provides a unique opportunity to study the deep lithospheric structure of the orogen in detail. The complete data set for the eastern Alps will be available in 2021. Building on surface-wave and receiver-function measure-ments carried out in separate projects in the first phase of the SPP, we will perform a joint inver-sion of the data that will result in a high-resolution, shear-wave velocity model of the lithosphere to resolve both the absolute shear-wave velocity and major crust and mantle discontinuities. We will extend stochastic inversion schemes to obtain isotropic and anisotropic models and their uncertain-ties. The resulting high-resolution model will yield a seismic model for the eastern Alpine litho-sphere. Relating it to the geological record at the surface, the tectonic affinity of the main deep structures will be identified. Based on seismological observations, we will develop together with co-operation partners focusing on the research theme “Reorganizations of the lithosphere during moun-tain building” a 4D comprehensive model of the tectonic evolution of the lithosphere in the eastern Alps since the beginning of the Neogene. It will provide the basis for numerical geodynamic modelling of mountain building.

阿尔卑斯山的山区建筑始于新近纪始于源自欧亚大陆的地壳单元，介入的海洋鲈鱼和微观内心因接近的阿达利亚水平意图而被强烈变形和折叠。东阿尔卑斯山非常适合研究山区建筑的全部复杂性，包括地壳分层和变形，nappe堆叠和横向逃生。但是，由于东高山域中的地壳和深层岩石圈结构的解决方案仍然很差，因此驱动力的基础过程仍然存在神秘。由于东部阿尔卑斯山中的新近纪，因此理解山区建筑过程的先决条件是鉴定缝合线以北的侧向逃生的意图的形状和脱钩地平线以及深层岩石圈结构的澄清。如果阿德里亚（Adria）或欧亚大陆（Adria）或欧亚大陆（Adria）是上板，或者山区建筑是俯冲的结果，则重新引起了一个悬而未决的问题。同样，需要解决地幔岩石圈的特性，因为它们是量化导致碰撞和山区建筑物的构造力的关键。 Alparray是有史以来最稠密的区域地震阵列 - 提供了一个独特的机会，可以详细研究造山机的深层岩石圈结构。 The complete data set for the Eastern Alps will be available in 2021. Building on surface-wave and receiver-function measurement-ments carried out in separate projects In the first phase of the SPP, we will perform a joint inver-sion of the data that will result in a high-resolution, shear-wave velocity model of the lithosphere to resolve both the absolute shear-wave velocity and major crust and mantle discontinuities.我们将扩展随机反转方案，以获得各向同性和各向异性模型及其不确定的纽带。所得的高分辨率模型将为东高山岩石圈产生地震模型。将其与表面的地质记录有关，将确定主要深层结构的构造亲和力。基于地震学观察，我们将与合作伙伴一起发展，重点是研究主题“在山间建筑期间岩石圈的重组”，这是自新贡开始以来东部阿尔卑斯山岩石圈构造演化的4D综合模型。它将为山区建筑的数值地球动力学建模提供基础。