6W (2024-2024): Seismic reconnaisance of Milne Ice Shelf, Nunavut, Canada, as a platform for study of sea-ice using microsesism.

• University of Chicago

This project accomplishes three important missions: (1) assessment of the difference between microseism measured on land and microseism measured on floating ice in the Arctic (this will address one of the funded NSF projects at University of Chicago which will use land based data already collected and archived to assess the influence of sea ice on microseism), (2) a short-term seismic signal reconnaissance of the Milne Ice Shelf, located immediately north of the coast of Ellesmere Island in the Canadian Arctic, to determine the location's suitability for a longer-term deployment of a seismic array to study sea ice conditions in this important area of the Arctic Ocean, and (3) training and skill development of a graduate student at the University of Chicago who will be joining a Canadian field team on Milne Ice Shelf during July 2024. The project is funded primarily by the Canadian government, but the costs for the graduate student's participation in the field work will be paid by an existing NSF grant (Office of Polar Programs) held at the University of Chicago. Two broadband sensors, of the same type and configuration as successfully used in 2023, plus 2 nodes are requested. One broad band sensor and 2 nodes will be deployed on the Milne Ice Shelf proper, and one broadband will be deployed on land at a field staging camp called Purple Valley. The instrument array will be operated from approximately 5 July to 31 July. At the end of July 2024, when the field project concludes, the instruments will be hand carried back to Chicago for onward shipment to PASSCAL. Data from the short deployment will be assessed for microseism signal in the frequency band that is commonly influenced by sea ice processes in the surrounding ocean. Additional analysis will be made of the higher frequency signals so as to determine the likely frequency and source mechanisms of other cryoseisms, such as ice quakes, fracture events, and temperature related thermal buckling. At the end of 2024, the data will be deposited in the DMC following all rules, regulations and data formats required by IRIS PASSCAL.

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