A discussion paper by Rowan Romayn (UiT), Alfred Hanssen (UiT), Bent Ole Ruud (UiB), Helene Meling Stemland (UiB), and Tor Arne Johansen (UiB & UNIS), titled “Passive seismic recording of cryoseisms in Adventdalen, Svalbard”, is in review for the journal The Cryosphere. The scientific community is invited to participate in the interactive discussion, which is open until 20 August 2020.
A series of transient seismic events were discovered in passive seismic recordings from 2D geophone arrays deployed at a frost polygon site in Adventdalen, Svalbard. These events contain a high proportion of surface wave energy and produce high-quality dispersion images through an innovative source localisation approach, based on apparent offset resorting and inter-trace delay minimisation, followed by cross-correlation beamforming dispersion imaging. The dispersion images are highly analogous to surface wave studies of pavements and display a complex multimodal dispersion pattern. Supported by theoretical modelling based on a highly simplified arrangement of horizontal layers, we infer that a ~ 3.5–4.5 m thick, stiff, high-velocity layer overlies a ~ 30 m thick layer that is significantly softer and slower at our study site. Based on previous studies we link the upper layer with syngenetic ground-ice formed in aeolian sediments, while the underlying layer is linked to epigenetic permafrost in marine-deltaic sediments containing unfrozen saline pore water. Comparing events from spring and autumn shows that temporal variation can be resolved via passive seismic monitoring. The transient seismic events that we record occur during periods of rapidly changing air temperature. This correlation along with the spatial clustering along the elevated river terrace in a known frost polygon, ice-wedge area and the high proportion of surface wave energy constitutes the primary evidence for us to interpret these events as frost quakes, a class of cryoseism. In this study we have proved the concept of passive seismic monitoring of permafrost in Adventdalen, Svalbard.
Romeyn, R., Hanssen, A., Ruud, B. O., Stemland, H. M., and Johansen, T. A. (in review): Passive seismic recording of cryoseisms in Adventdalen, Svalbard. The Cryosphere Discuss, in review, 2020. DOI: 10.5194/tc-2020-141. [intranet]