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The first experiment on hectometer scale is the Bedretto Reservoir Project (BRP), which studies geothermal exploration. Compared with decameter scale experiments, the financial and organizational costs are significantly increased in hectometer scale experiments and the implementation of high-resolution monitoring comes with considerable risks. We discuss in detail risks for monitoring equipment in hectometer scale experiments and introduce the BRP monitoring network, a multi-component monitoring system combining sensors from seismology, applied geophysics, hydrology, and geomechanics. The multi-sensor network is installed inside long boreholes (up to 300 m length), drilled from the Bedretto tunnel. Boreholes are sealed with a purpose-made cementing system to reach (as far as possible) rock integrity within the experiment volume. The approach incorporates different sensor types, namely, piezoelectric accelerometers, in situ acoustic emission (AE) sensors, fiber-optic cables for distributed acoustic sensing (DAS), distributed strain sensing (DSS) and distributed temperature sensing (DTS), fiber Bragg grating (FBG) sensors, geophones, ultrasonic transmitters, and pore pressure sensors. The network was realized after intense technical development, including the development of the following key elements: rotatable centralizer with integrated cable clamp, multi-sensor in situ AE sensor chain, and cementable tube pore pressure sensor.<\/jats:p>","DOI":"10.3390\/s23063315","type":"journal-article","created":{"date-parts":[[2023,3,22]],"date-time":"2023-03-22T06:35:28Z","timestamp":1679466928000},"page":"3315","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":26,"title":["Multi-Disciplinary Monitoring Networks for Mesoscale Underground Experiments: Advances in the Bedretto Reservoir Project"],"prefix":"10.3390","volume":"23","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7739-2554","authenticated-orcid":false,"given":"Katrin","family":"Plenkers","sequence":"first","affiliation":[{"name":"Department of Earth Sciences, ETH Zurich, 8092 Zurich, Switzerland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Andreas","family":"Reinicke","sequence":"additional","affiliation":[{"name":"Nagra, 5430 Wettingen, Switzerland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Anne","family":"Obermann","sequence":"additional","affiliation":[{"name":"Swiss Seismological Service, ETH Zurich, 8092 Zurich, Switzerland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Nima","family":"Gholizadeh Doonechaly","sequence":"additional","affiliation":[{"name":"Department of Earth Sciences, ETH Zurich, 8092 Zurich, Switzerland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hannes","family":"Krietsch","sequence":"additional","affiliation":[{"name":"Department of Earth Sciences, ETH Zurich, 8092 Zurich, Switzerland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Thomas","family":"Fechner","sequence":"additional","affiliation":[{"name":"Geotomographie, 56567 Neuwied, Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9525-4609","authenticated-orcid":false,"given":"Marian","family":"Hertrich","sequence":"additional","affiliation":[{"name":"Department of Earth Sciences, ETH Zurich, 8092 Zurich, Switzerland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Karam","family":"Kontar","sequence":"additional","affiliation":[{"name":"Solexperts, 8617 Moenchaltorf, Switzerland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hansruedi","family":"Maurer","sequence":"additional","affiliation":[{"name":"Department of Earth Sciences, ETH Zurich, 8092 Zurich, Switzerland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Joachim","family":"Philipp","sequence":"additional","affiliation":[{"name":"Gesellschaft f\u00fcr Materialpr\u00fcfung und Geophysik mbH (GMuG), 61231 Bad Nauheim, Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Beat","family":"Rinderknecht","sequence":"additional","affiliation":[{"name":"BRtechnik, 8713 Zurich, Switzerland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Manuel","family":"Volksdorf","sequence":"additional","affiliation":[{"name":"Drillwerk, 30457 Hanover, Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5573-7638","authenticated-orcid":false,"given":"Domenico","family":"Giardini","sequence":"additional","affiliation":[{"name":"Department of Earth Sciences, ETH Zurich, 8092 Zurich, Switzerland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Stefan","family":"Wiemer","sequence":"additional","affiliation":[{"name":"Swiss Seismological Service, ETH Zurich, 8092 Zurich, Switzerland"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2023,3,21]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"1767","DOI":"10.1029\/2000GL011547","article-title":"Seismic and Micromechanical Studies of Rock Fracture","volume":"27","author":"Young","year":"2000","journal-title":"Geophys. 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