Department of Geophysical Imaging

Cryoseismology

Temporal distribution of ‘glacier-induced’ events from the HSPB station. ‘Low-frequency glacier-related’ marked in orange, ‘Highfrequency glacier-related’ marked in blue and plotted on top of ‘LFGR’ (a) 1 month step distribution with the mean monthly temperature – red solid line, and summed monthly precipitation – black dotted line, a data gap is indicated by the shaded rectangle; (b) monthly distribution of all events summed over 2008–2014, with summed precipitation – black solid line, and mean temperature in each month over 2008–2014 – red solid line; and (c) distribution of all events between 2008 and 2014, with the mean temperature in warm months (VI-XI) – red solid line, the summed precipitation in warm months (VI-XI) – black solid line, whole year mean temperature – red dashed line and whole year summed precipitation – black dotted line.

Glaciers are dynamic systems that are in constant motion. Their movement, changes in their stress regime, cracks and crevasse expansion, iceberg calving and ice-basal friction all release energy, which can release detectable seismic signals.

Our research focuses on glaciers located in Hornsund, southern Spitsbergen, in the vicinity of Polish Polar Station, with special interest in Hans glacier.

We developed an automatic procedure capable of detecting glacier-induced seismic events using records from a single permanent seismological station located nearby Hans glacier. To distinguish between glacial and non-glacial signals, We developed a fuzzy logic algorithm based on the signal frequency and energy flow analysis.

The paper presenting 7-years long glacier activity analysis is available on-line HERE.

In September 2017 We have installed a seismic monitoring network around the Hans glacier calving cliff. The network have been recording permanently till May 2018. The data is being processed right now and is available online HERE. More on that topic can be find in Seismology chapter of SESS 2019 report and in project log. The project is carried by Wojciech Gajek and coworkers, financed by an internal grant of Institute of Geophysics Polish Academy of Sciences.

A map of temporal seismic network and Hans glacier terminus. Station installed on rocks are marked with cirles, station installed on glacier are marked with dots.