Seismic Network (data acquisition system, seismometers, accelerometers, DAS interrogator unit)

地震网络（数据采集系统、地震仪、加速度计、DAS 询问器单元）

• 批准号: 504334395
• 金额: --
• 依托单位: Universität zu Köln
• 依托单位国家: 德国
• 项目类别: Major Research Instrumentation
• 财政年份: 2022
• 资助国家: 德国
• 起止时间: 2021-12-31 至 无数据
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/504334395?language=en
• 关键词: Seismic; Network; data; acquisition; system

Cologne is the only German city with more than one million inhabitants exposed to a significant seismic hazard. The surrounding Lower Rhine Embayment also includes several large-scale open-pit lignite mines. This proposal aims to refurbish the strong motion network ot the Bensberg seismic observatory, consisting of 23 stations within 60 km of Cologne, and enhance the performance of the existing seismic networks by adding five new strong motion and five new microseismic stations as well as an innovative laser-based DAS (Distributed Acoustic Sensing) interrogator unit that can measure ground motion with unprecedented spatial resolution by using light scattering in optical fibres. The data acquisition of the strong motion network has been in continuous 24/7 operations for the past 15 years and is increasingly prone to failures. Besides, it is outdated and no longer compatible with current (64-bit) computers, so it needs to be replaced completely. The new data acquisition will provide continuous real-time data access and produce data in a standard format, for easy exchange and sharing via European Open Data initiatives and closer collaboration with neighbouring seismological surveys. The main aim of the strong motion network, besides aiding in locating microseismic events in the vicinity of each individual station, is the unclipped recording of ground motion in case of strong earthquakes. These recordings, also at locations close to the source, are instrumental for deriving parameters of relevance to earthquake engineering, and accordingly in developing ground motion prediction equations for the region and estimating seismic hazard. Since large earthquakes are rare in the Lower Rhine Embayment (i.e. have an estimated recurrence interval of 15 to 20 years for magnitude 5.0), continuous long-term monitoring is mandatory. The additional strong motion stations will help to address the question of the influence of recultivated areas vs. naturally deposited sediments on the amplitudes of ground motion, which is of high relevance for estimates of seismic ground motion in the areas affected by open-pit lignite mines. Additional microseismic stations will increase the detection efficiency and performance of the network in microseismic monitoring. The DAS interrogator unit provides new observables with multiple benefits, e.g. to earthquake location, mapping of faults, studying the sub-surface structure and its small-scale variations, which have important implications for amplification of ground motion during earthquakes. We aim to use the DAS interrogator unit in dedicated measurement campaigns, e.g. across known or suspected faults, in areas with sedimentary cover where a better knowledge of the elastic parameters of the subsurface would be beneficial for both hazard assessment and microseismic event location, or in aftershock monitoring, to make the best use of this innovative technology.

科隆是唯一一个遇到严重地震危险的德国城市。周围的下莱茵河胚胎还包括几个大型开放坑褐煤矿。该提案旨在翻新本堡地震观测站的强大运动网络，由科隆60公里以内的23个站组成，并通过添加五个新的强力运动和五个新的Microse震荡站来增强现有的地震网络的性能，并使用基于创新的激光介绍的动作（分布式的声音）动作（分布式的声音）动作（分布式的声音）动作（分布式的）动作（分布式的）动作（分布）的动作，光纤中的散射。在过去的15年中，强大运动网络的数据获取一直在24/7的连续操作中进行，并且越来越容易出现故障。此外，它已过时，并且不再与当前（64位）计算机兼容，因此需要完全更换它。新的数据采集将提供连续的实时数据访问，并以标准格式生产数据，以便于欧洲开放数据计划，并与邻近的地震学调查进行更紧密的合作。强大的运动网络的主要目的除了帮助在每个站点附近定位微震震事件外，在发生强烈地震的情况下，地面运动的记录是未拉的。这些记录也是在靠近来源的位置，有助于得出与地震工程相关的参数，因此，在为该地区开发地面运动预测方程并估算地震危险方面。由于在莱茵河下部的较低地震中很少见（即5.0级的估计复发间隔为15至20年），因此必须连续长期监测。额外的强运动站将有助于解决重新栽培区域与自然沉积沉积物对地面运动振幅的影响的问题，这对于受开放坑褐煤矿山影响的区域的地震地面运动的估计很高。其他微震动站将提高网络在微观震荡监测中的检测效率和性能。 DAS询问器单元提供具有多个好处的新可观察物，例如到地震位置，断层的映射，研究地下结构及其小规模变化，这对地震期间地面运动的扩增具有重要意义。我们的目标是在专门的测量活动中使用DAS询问单元，例如在已知或怀疑的断层中，在具有沉积覆盖的地区，对地下的弹性参数的更好了解将有助于危害评估和微震震活动位置或在余震监测中，以充分利用这项创新技术。