A comprehensive high resolution 3D P- and S-wave velocity model for the Alpine mountain chain using local earthquake data: Constraining crustal structure, lithologies and mountain-building processes

使用当地地震数据的阿尔卑斯山脉综合高分辨率 3D P 波和 S 波速度模型：约束地壳结构、岩性和造山过程

• 批准号: 442590192
• 负责人: Dr. Christian Haberland
• 金额: --
• 依托单位: Sektion 2.2: Geophysikalische Abbildung des Untergrunds
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/442590192?language=en
• 关键词: comprehensive; resolution; 3D; wave; velocity

Description:The dense AlpArray Seismic Network (AASN) allows for the first time to image in high resolution the seismic properties of the crust and mantle lithosphere beneath the Alps. Although numerous studies and seismic experiments have been conducted to decipher the mountain building processes in the Alps, only in the Western Alps some degree of consensus has been reached. However, for the Eastern Alps structure and tectonic processes leading to mountain building are still controversially discussed. The tectonic revolution in the Eastern Alps as discussed by Handy et al. in the introduction to the second period of the SPP must find its expression in the crust, most notably as large scale crustal decoupling horizons; however, their location and extend are not constrained yet by geophysical images. Additionally, the possible polarity flip of subduction in the Eastern Alp is still hotly debated, but if existent should be accompanied by a Moho jump.In this proposal we will use Local Earthquake Tomography (LET) to image the P- and S-wave velocities and corresponding Poisson ratio (Vp/Vs) and precise earthquake hypocenters in the Alpine crust and mantle lithosphere providing essential geophysical images and constraints to unravel the processes involved in the tectonic revolution. For the analysis of the waveform data (picking/identification of phases) we will use methods related to artificial intelligence and machine learning. We will directly address Theme 1: Reorganisations of the lithosphere during mountain building by delineating intra-crustal structures and Moho topography. Our comprehensive velocity model will also address Theme 2: crustal response of changes in mountain structure by linking the investigated surface structures in MB4D with high resolution images of mantle processes that are currently debated in the seismological community (e.g. slab polarity flip). The work is part of a cluster of proposals with complementary goals and approaches to investigate the Neogene Orogenic Revolution of the Alps. This cluster will provide the necessary complimentary expertise in Alpine geology, numerical modelling, and seismology needed to unravel the mountain building processes in the Eastern Alps. Deliverables:• 3D high resolution P- and S-wave velocity (and Poisson ratio) model of the Alps• High resolution earthquake locations and associated uncertainties• Crustal corrections for upper mantle tomography studies• A comprehensive waveform database and event database (including travel times) for further analysis

说明：密集的AlpArray地震网络（AALPArray）首次能够对阿尔卑斯山下地壳和地幔岩石圈的地震特性进行高分辨率成像。虽然已经进行了许多研究和地震实验来破译阿尔卑斯山的造山过程，但只有在西阿尔卑斯山达成了一定程度的共识。然而，对于东阿尔卑斯山的结构和构造过程，导致山脉建设仍然是有争议的讨论。Handy等人在SPP第二期的导言中讨论的东阿尔卑斯山的构造革命必须在地壳中找到其表达，最明显的是大规模地壳解耦层位;然而，它们的位置和延伸尚未受到地球物理图像的限制。此外，东阿尔卑斯山俯冲可能发生的极性翻转仍然存在激烈争论，但如果存在的话，应该伴随着莫霍面跳跃。在这个建议中，我们将使用局部地震层析成像（LET）来成像P波和S波速度以及相应的泊松比（Vp/Vs）。和精确的地震震源在阿尔卑斯山地壳和地幔岩石圈提供必要的地球物理图像和限制，以解开地质构造革命的过程。对于波形数据的分析（相位的拾取/识别），我们将使用与人工智能和机器学习相关的方法。我们将直接解决主题1：重组岩石圈在造山过程中，通过描绘地壳内结构和莫霍面地形。我们的综合速度模型还将解决主题2：通过将MB 4D中调查的地表结构与目前在地震学界争论的地幔过程（例如板极翻转）的高分辨率图像联系起来，对山脉结构变化的地壳响应。这项工作是一系列建议的一部分，这些建议具有互补的目标和方法，以调查阿尔卑斯山的新第三纪造山运动。该集群将提供必要的补充专业知识，在阿尔卑斯山地质学，数值建模，地震需要解开在东阿尔卑斯山的造山过程。可选项：· 阿尔卑斯山的三维高分辨率P波和S波速度（和泊松比）模型 高分辨率地震位置和相关的不确定性 上地幔层析成像研究的地壳校正 用于进一步分析的综合波形数据库和事件数据库（包括行程时间）