Earth surface response to Quaternary faulting and shallow crustal structure in the eastern Adria-Alpine collision zone and the Friulian plain

亚得里亚海东部-阿尔卑斯山碰撞带和弗留利平原第四纪断层和浅地壳结构的地表响应

• 批准号: 365171455
• 负责人: Professor Dr. Friedhelm von Blanckenburg
• 金额: --
• 依托单位: Fachrichtung Geochemie, Hydrogeologie, Mineralogie
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2017
• 资助国家: 德国
• 起止时间: 2016-12-31 至 2021-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/365171455?language=en
• 关键词: Earth; surface; response; Quaternary; faulting

The eastern Southern Alps-Dinarides region of the Alps is subjected to the strongest crustal motion in the entire Alps and thus allows to directly explore the response of Earth's surface to tectonic activity. In a consortium of geologists, geophysicists, and geochemists we will investigate the geometry of major active faults, their sense of motion, and how they drive erosion using a set of interdisciplinary tools: a) new high-resolution digital elevation models from airborne LiDAR surveys, stereo satellite data, and low-cost local surveys with drones; b) seismic tomography data (mainly based on SWATH C) and near-surface geophysical surveys to image surface traces and the sub-surface structure of active faults; c) 3D imaging techniques to investigate earthquake site effects; d) dating of the recent deformation in outcrops and palaeoseismological trenches to determine long-term slip rates, earthquake recurrence intervals, and palaeo-magnitudes; e) quantification of the erosional response to active faulting using catchment-wide erosion rates from in situ cosmogenic 10Be in river sediment. This study shall bridge the gaps between the distribution of seismicity (recorded with the seismograph array in the 4D-MB project), the surficial manifestation of Quaternary faulting, and erosion as driven by active tectonics. The research is linked to research theme 4 (motion patterns and seismicity) and theme 2 (surface response) of the SPP 4D-MB. This study will provide important insight towards analysing seismic risk and hazard in this densely populated area.

南阿尔卑斯山东部-阿尔卑斯山的Dinarides地区是整个阿尔卑斯山中地壳运动最强烈的地区，因此可以直接探索地球表面对构造活动的反应。在一个由地质学家、地质学家和地球化学家组成的联盟中，我们将研究主要活动断层的几何形状、它们的运动感以及它们如何使用一套跨学科工具驱动侵蚀：a）来自机载LiDAR调查的新的高分辨率数字高程模型，立体卫星数据，以及使用无人机进行的低成本本地调查; B）地震层析成像数据（主要基于SWATH C）和近地表地球物理调查，以成像活动断层的地表痕迹和次表层结构; d）确定露头和古地震学海沟中的近期变形的年代，以确定长期滑动速率、地震复发间隔和古震级; e）使用河流沉积物中原位宇宙成因10 Be的全流域侵蚀速率，量化对活动断层的侵蚀响应。这项研究将填补地震活动性分布（用4D-MB项目中的地震仪阵列记录）、第四纪断层的地表表现和活动构造驱动的侵蚀之间的空白。该研究与SPP 4D-MB的研究主题4（运动模式和地震活动性）和主题2（表面响应）有关。这项研究将为分析这一人口稠密地区的地震风险和灾害提供重要的见解。