Stress transfer and Quaternary faulting in the northern Alpine foreland

北部高山前陆的应力传递和第四纪断裂

• 批准号: 365245717
• 负责人: Professor Dr. Klaus Reicherter
• 金额: --
• 依托单位: Geophysikalisches Institut (GPI)
• 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/365245717?language=en
• 关键词: Stress; transfer; Quaternary; faulting; northern

We propose to investigate the relationship between seismicity and the faulting behaviour of major faults in the Northern Alpine foreland region. This will be done interdisciplinary by means of seismology (exact and precise hypocentre determination, fault plane solution, and stress estimation) and neotectonics (remote sensing, near-surface geophysics, and geological field studies). Although the Alps and their forelands seem to have experienced major seismicity in the past, historical seismicity only find c. Mw 6.9 near the Upper Rhine Graben (URG), with uncertain epicentre(s) and causative fault(s). Only the Vienna basin has evidence for M~7 from paleoseismology. The bias between earthquake activity, (surface) rupture during major earthquakes and tectonic morphology in the northern foreland remains not understood; contributing factors may be i.e. deglaciation rebound, sediment loading, stress decoupling etc., however their quantitative influence is not sufficiently known.We focus our studies on three areas in the first term of the SPP: the Albstadt Shear Zone (ASZ), the Molasse basin (MB) and the southern half of the URG. High resolution seismicity studies (hypocentres, fault planes, stresses) will help to understand the surficial expression of faults and long-term slip rates. Overall, the study will reveal how the deformation is distributed and if the reactivation of faults is preferred over the formation of new ones in this structurally complicated and highly populated area. The seismology work will be based on recordings from the AlpArray network, the KIT KABBA datacentre and the state earthquake surveys, this offers a unique chance to study the local seismicity in details. The discrepancy between the tectonic morphology and the absence of seismicity will be studied by neo- and active tectonic studies that will focus on young landscapes (post-glacial) and also the youngest fault deposits. All research themes are closely related to SPP 4D-MB and AlpArray.

我们建议研究北方阿尔卑斯山前陆地区地震活动性与主要断层活动性之间的关系。这将通过地震学（准确和精确的震源测定、断层面解和应力估计）和新构造学（遥感、近地表地球物理学和地质实地研究）跨学科进行。虽然阿尔卑斯山及其前地似乎在过去经历过大地震活动，但历史上的地震活动只发现c。Mw6.9，靠近上莱茵河地堑（URG），震中和成因断层不确定。只有维也纳盆地有古地震学上的M~7证据。地震活动、大地震期间的（地表）破裂和北方前陆的构造形态之间的偏差仍然不清楚;促成因素可能是冰川消退反弹、沉积物加载、应力解耦等，在SPP的第一期，我们主要研究了三个地区：阿尔布施塔特剪切带（ASZ）、磨拉石盆地（MB）和URG的南半部。高分辨率地震活动性研究（震源、断层面、应力）将有助于了解断层的地表表现和长期滑动速率。总的来说，这项研究将揭示变形是如何分布的，以及在这个结构复杂和人口稠密的地区，断层的重新激活是否优于新断层的形成。地震学工作将基于AlpArray网络、KIT卡巴地震中心和国家地震调查的记录，这为详细研究当地地震活动提供了一个独特的机会。将通过新构造和活动构造研究来研究构造形态和地震活动缺失之间的差异，这些研究将侧重于年轻景观（冰川期后）以及最年轻的断层沉积物。所有研究主题都与SPP 4D-MB和AlpArray密切相关。