Superconducting Gravimeter Data from Buchholz, Eifel - Level 1

The International Geodynamics and Earth Tides Service (IGETS) was established in 2015 by the International Association of Geodesy IAG. IGETS continues the activities of the Global Geodynamics Project (GGP) between 1997 and 2015 to provide support to geodetic and geophysical research activities using superconducting gravimeter (SG) data within the context of an international network. As part of this network, the Eifel Gravimetric Observatory Germany (EIGOG) was established by the GFZ Helmholtz Centre for Geosciences in August 2025. Continuous time-varying gravity and atmospheric pressure data from the SG at EIGOG are integrated in the IGETS data base hosted by GFZ.

The EIGOG observatory is located at the Buchholz Provostry (Propstei Buchholz) in the municipality of Burgbrohl. It is part of a multiparameter station for the monitoring and analysis of seismic and volcanic signals within the Central European Volcanic Province Observatory (CVO) in the Eifel region. Additional sensors at Buchholz are GNSS, InSAR corner reflector, seismometer, tiltmeter, groundwater level and a weather station. The operation and maintenance of the EIGOG instrumentation is done by staff of the GFZ.

EIGOG is a high precision gravimetric observatory with the dual-sphere OSG D037 manufactured by GWR Instruments as core instrument, one of the two SGs operating at Sutherland, South Africa, until December 2024 (Förste et al., 2016, http://doi.org/10.5880/igets.su.l1.001). The time series of gravity and barometric pressure from the OSG D037 starts in August 2025. The SG is active and the time series is kept up to date regularly with a time delay of a few months. The time sampling of the raw gravity and barometric pressure data of IGETS Level 1 is 1 second and 1 minute. For a detailed description of the IGETS data base and the provided files see Voigt et al. (2016, http://doi.org/10.2312/GFZ.b103-16087).

国际大地动力学与地球潮汐服务（International Geodynamics and Earth Tides Service, IGETS）由国际大地测量协会（International Association of Geodesy, IAG）于2015年创立。IGETS承接了1997年至2015年全球大地动力学项目（Global Geodynamics Project, GGP）的相关工作，旨在依托国际联网的超导重力仪（superconducting gravimeter, SG）数据，为大地测量与地球物理研究活动提供支持。作为该观测网络的组成部分，德国亥姆霍兹地学研究中心（GFZ Helmholtz Centre for Geosciences）于2025年8月建成德国埃菲尔重力观测台（Eifel Gravimetric Observatory Germany, EIGOG）。EIGOG产出的超导重力仪连续时变重力与大气压强数据，已汇入由GFZ托管的IGETS数据库。

EIGOG观测台位于布尔格布罗尔市的布赫霍尔茨修道院（Propstei Buchholz），是埃菲尔地区中欧火山省观测台（Central European Volcanic Province Observatory, CVO）内多参数监测站的组成部分，用于地震与火山信号的监测与分析。布赫霍尔茨观测点还部署了额外的传感器，包括全球导航卫星系统（Global Navigation Satellite System, GNSS）、干涉合成孔径雷达（Interferometric Synthetic Aperture Radar, InSAR）角反射器、地震计、倾斜仪、地下水位监测设备以及气象站。EIGOG观测仪器的运维工作由GFZ的工作人员负责。

EIGOG是以GWR仪器公司（GWR Instruments）制造的双球型OSG D037为核心仪器的高精度重力观测台，该仪器曾是南非萨瑟兰地区运行的两台超导重力仪之一，直至2024年12月（Förste等，2016，http://doi.org/10.5880/igets.su.l1.001）。OSG D037采集的重力与大气压强时间序列始于2025年8月，目前仪器仍处于正常运行状态，时间序列以数月的延迟定期更新。IGETS一级数据（Level 1）的原始重力与大气压强数据采样率分别为1秒与1分钟。如需了解IGETS数据库及所提供文件的详细说明，请参阅Voigt等（2016，http://doi.org/10.2312/GFZ.b103-16087）。