Overview of the 250 mobile seismological stations (Fairfield nodes) received in Sveagruva (Svalbard - Norway) for deployment as part of the Icewaveguide project.

• Main Author: Boué, Pierre
• Other Authors: Institut des Sciences de la Terre (ISTerre), Institut national des sciences de l'Univers (INSU - CNRS)-Institut de recherche pour le développement IRD : UR219-Université Grenoble Alpes (UGA)-Université Gustave Eiffel-Centre National de la Recherche Scientifique (CNRS)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )
• Format: Still Image
• Language: English
• Published: HAL CCSD 2019
• Subjects: Fairfield node; SISMOB; Seismological station; Field instrumentation; Seismology; RESIF; Station sismologique; Instrumentation mobile; Sismologie; [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph]; Arctic; Jan Mayen; Norway; Svalbard; Sveagruva; Vallunden; Global warming; ice pack; Sea ice
• Online Access: https://medihal.archives-ouvertes.fr/hal-03030345; https://medihal.archives-ouvertes.fr/hal-03030345/image; https://medihal.archives-ouvertes.fr/hal-03030345/file/ICEWAVEGUIDE_photo_31.jpg

The sea ice is disappearing with global warming, and if the trend is clear over the last few decades, scientists are still wondering about the speed of this disappearance, which seems much greater than the models predict.To better assess the quality of the polar ice (its thickness, its degree of fracturing), a team of scientists conducted a reconnaissance and test expedition in February and March 2019. The objective was to listen to the natural vibrations of the ice pack to deduce its mechanical characteristics (thickness, solidity, etc.). A pilot site was identified in Svalbard, at 78° north latitude, as close as possible to the Arctic pack ice. 250 seismic sensors (seismometers) from the SisMob mobile instrument park of Résif were installed there for one month to record the vibrations and murmurs of this small ephemeral pack ice (it forms only a few months per year) in the Sveagruva fjord.This picture shows the inventory of the stations and their preparation for deployment on Lake Vallunden (Svalbard - Norway) during Icewaveguide project.During the transport phase the nodes are switched off. Once on site they must be ""reactivated"". This step is done thanks to the yellow tablet that can be seen on the ground. It is connected to the nodes via the cable and allows the dialogue with the nodes. The first action carried out is therefore the starting of the nodes, an action which will allow the reception of the satellites necessary for the good synchronization of the data. The nodes are then deployed on the study area, where they will record the ground movements. Sismob is part of Résif, a national research infrastructure dedicated to the observation and understanding of the internal Earth structure and dynamics. Résif is based on observation networks of high technological level, composed of seismological, geodetic and gravimetric instruments densely deployed throughout France. The data collected allow to study with a high spatio-temporal resolution the ground deformation, the superficial and deep structures, the ...