We aim to contribute to the European Green Deal, the UN Sustainable Development Goals and the Horizon Europe objectives through the development of a Geological Service for Europe, which focuses on the planet itself: the earth beneath our feet. The subsurface holds indispensable resources for European industries and opportunities to decarbonise our economy, but also requires careful management to preserve a healthy and safe living environment for Europe’s citizens. Structurally addressing the EU dimension in geological services is needed because the scale of many societally and economically relevant geological features exceeds that of individual countries. Addressing transnational and continental-scale problems requires innovation, standardisation, harmonisation as well as a shared vision. We aim to build the Geological Service for Europe based on Europe’s best practices and implement the Service with the backing of the Union. Existing geological surveys, the national custodians of geological information, have amassed huge legacies of data and information that are difficult to merge. This project will continue the harmonisation and standardisation effort initiated in earlier projects. We aim to create joint services that can support acceleration of the energy and climate transitions, as well as a larger critical mass of intra-European cooperation through convergence of our research agendas, as key steps to increase the amount and quality of results we are aiming for. A common thread in this project is innovation in ways in which subsurface information is conceptualised, organised, visualised, delivered and translated to the needs of a wide range of audiences, and the methodologies to achieve this. Building on the groundwork laid in the GeoERA program, we will scale up and out, not only scientifically, but also in involving national stakeholders in the network, in order to create support and eventually obtain a mandate for a European Service on a permanent basis.

Imaging the Earth's interior has always been one of the key challenges in geosciences as it is a prerequisite for understanding our planet's internal dynamics and the coupling between its inner and outer envelopes. Gravity measurements at different altitudes (ground, airborne and space-based observations) provide a unique imaging tool, as they supply direct information on mass changes at different spatio-temporal scales. Following decades of research, developments and industrial transfers, quantum technology reached a high level of maturity and it is now possible to deliver operational quantum gravimeters offering various advantages with respect to devices that have been hitherto used. Aligned with the objective of strengthening EU’s strategic autonomy and competitiveness, EQUIP-G proposes to deploy a network of quantum gravimeters in Europe. This will represent the first step towards establishing the terrestrial segment of the pan-European quantum gravimetry infrastructure, revolving around a shared instrumentation facility (Instrumental Park). For this purpose, quantum gravimeters, dual quantum gravi-gradiometers and an onboard quantum gravimeter will be employed. These instruments will be comprehensively tested, before being deployed in the field. We will demonstrate, through innovative measurement strategies, the ability of the quantum gravity network to contribute to EU priorities, such as green deal, energy management and risk mitigation. Metrological oversight will ensure that all collected quantum gravity data will be SI traceable. Data will be managed in line with the FAIR principles and with a long-term perspective to establish a TCS for gravimetry within EPOS. EQUIP-G will engage in strong community building, aimed at involving the whole European gravimetry community in the development of the long-term Instrumental Park initiative that will extend beyond the end of the project, democratizing the use of quantum gravity devices produced in Europe.