Follow the CO2 (ICDP Eifel): Pre-site survey by large-N passive seismology (Survive)

艾菲尔火山是中欧分布火山作用的世界级范例。在全球比较中，突出的不仅是它的两个第四纪子田的大小和火山的数量，而且在大约700 ka内喷发超过350次的喷发率。所有已知的艾菲尔火山喷发都发生在史前时期，现在高度城市化的地区。该提案的主要目标是解决和表征东艾菲尔火山场（EEVF）声母中心下方上地壳的小尺度P波和s波速度异常，ICDP-EIFEL计划在该区域进行第一期和第二期钻探。速度异常的组合对理解和解释残余岩浆储层以及解决温度升高的体积构成了重要的限制。此外，如果结合对二氧化碳脱气、变形和地震活动的测量，可以支持浅层热液系统的模型。这一目标应通过结合波形和地震活动性分析的局部地震层析成像和环境地震噪声层析成像来实现。为了进行分析，将使用2022年9月至2023年8月期间运行的超过494个地震台站的临时大n地震实验数据，并辅以永久地震台网和光纤（分布式声传感）的数据。

The volcanoes of the Eifel represent a world-class example of distributed volcanism in Central Europe. Outstanding in global comparison are not only the size of its two Quaternary subfields and number of volcanoes, but also the rate of eruptions with more than 350 eruptions within ca. 700 ka. All known eruptions in the Eifel occurred at prehistoric times in a now highly urbanized region. The main objective of this proposal is to resolve and characterize small scale P- and S-wave velocity anomalies in the upper crust beneath the phonolitic centres of the East Eifel Volcanic Field (EEVF), where the ICDP-EIFEL drilling phase 1 and 2 is planned. The combination of velocity anomalies pose important constraints to understand and interpret the remnant magma reservoirs, and to resolve volumes that have enhanced temperatures. Additionally, a model for the shallow hydrothermal system can be supported, if combined with measurements for CO2 degassing, deformation and seismicity. This objective shall be approached by local earthquake tomography and ambient seismic noise tomography in combination with waveform and seismicity analysis. For the analysis, data of a temporary Large-N seismological experiment with more than 494 seismic stations, which was operational between September 2022 and August 2023, complemented by data of the permanent seismic network and fibre optics (distributed acoustic sensing), will be used.