The AlpArray programme is a multinational, European consortium to advance our understanding of orogenesis and its relationship to mantle dynamics, plate reorganizations, surface processes and seismic hazard in the Alps-Apennines-Carpathians-Dinarides orogenic system. The AlpArray Seismic Network has been deployed with contributions from 36 institutions from 11 countries to map physical properties of the lithosphere and asthenosphere in 3D and thus to obtain new, high-resolution geophysical images of structures from the surface down to the base of the mantle transition zone. With over 600 broadband stations operated for 2 years, this seismic experiment is one of the largest simultaneously operated seismological networks in the academic domain, employing hexagonal coverage with station spacing at less than 52 km. This dense and regularly spaced experiment is made possible by the coordinated coeval deployment of temporary stations from numerous national pools, including ocean-bottom seismometers, which were funded by different national agencies. They combine with permanent networks, which also required the cooperation of many different operators. Together these stations ultimately fill coverage gaps. Following a short overview of previous large-scale seismological experiments in the Alpine region, we here present the goals, construction, deployment, characteristics and data management of the AlpArray Seismic Network, which will provide data that is expected to be unprecedented in quality to image the complex Alpine mountains at depth.

Bundesanstalt für Geowissenschaften und Rohstoffe Geozentrum Hannover Stilleweg 2 30655 Hannover Germany

Christian Albrechts Universität Kiel Otto Hahn Platz 1 24118 Kiel Germany

Department of Earth and Environmental Sciences Ludwig Maximilians Universität Theresienstrasse 41 80333 Munich Germany

Department of Meteorology and Geophysics University of Vienna Althanstrasse 14 1090 Vienna Austria

Dipartimento di Scienze della Terra dell'Ambiente e della Vita Università degli Studi di Genova Corso Europa 26 16132 Genoa Italy

Freie Universität Berlin Malteserstrasse 74 100 12249 Berlin Germany

Geodetic and Geophysical Institute Research Centre for Astronomy and Earth Sciences Hungarian Academy of Sciences Sopron 9400 Hungary

GEOMAR Helmholtz Centre for Ocean Research Kiel Wischhofstr 1 3 24148 Kiel Germany

Geophysical Institute Karlsruhe Institute of Technology KIT Hertzstr 16 76187 Karlsruhe Germany

Helmholtzzentrum Potsdam Deutsches GeoForschungsZentrum GFZ Telegrafenberg 14473 Potsdam Germany

Institut de Physique du Globe de Paris Sorbonne Paris Cité Université Paris Diderot UMR 7154 CNRS 75238 Paris Cedex 05 France

Institut de Physique du Globe de Strasbourg UMR 7516 Université de Strasbourg EOST CNRS 5 rue René Descartes 67084 Strasbourg Cedex France

Institut für Geophysik Westfälische Wilhelms Universität Münster Corrensstrasse 24 48149 Münster Germany

Institute of Earth and Environmental Science University of Potsdam Karl Liebknecht Strasse 24 25 14476 Potsdam Golm Germany

Institute of Earth Sciences Faculty of Geosciences and Environment University of Lausanne UNIL Mouline Géopolis 1015 Lausanne Switzerland

Institute of Geology Mineralogy and Geophysics Faculty of Geosciences Ruhr Universität Bochum 44780 Bochum Germany

Institute of Geophysics Czech Academy of Sciences Boční 2 1401 1a 141 31 Prague 4 Czech Republic

Institute of Geophysics Department of Earth Sciences ETH Zürich Sonneggstrasse 5 8092 Zurich Switzerland

Institute of Geosciences Goethe University Frankfurt Altenhöferallee 1 60438 Frankfurt am Main Germany

Istituto Nazionale di Geofisica e Vulcanologia Via di Vigna Murata 605 00143 Rome Italy

Istituto Nazionale di Oceanografia e di Geofisica Sperimentale Via Treviso 55 33100 Udine Italy

Kövesligethy Radó Seismological Observatory MTA CSFK GGI Meredek u 18 Budapest 1112 Hungary

Republic Hydrometeorological Service of Republic of Srpska 7800 Banja Luka Bosnia and Herzegovina

Slovenian Environment Agency Vojkova 1b 1000 Ljubljana Slovenia

Swiss Seismological Service at ETH Zürich Sonneggstrasse 5 8092 Zurich Switzerland

Université Côte d'Azur UPMC CNRS Observatoire de la Côte d'Azur IRD Géoazur 250 Rue Albert Einstein 06560 Valbonne France

Université Grenoble Alpes Université Savoie Mont Blanc CNRS IRD IFSTTAR ISTerre 38000 Grenoble France

University of Leipzig Talstrasse 35 04103 Leipzig Germany

University of Zagreb Horvatovac 95 10 000 Zagreb Croatia

Zentralanstalt für Meteorologie und Geodynamik Hohe Warte 38 1190 Vienna Austria

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