Abstract Distributed Acoustic Sensing (DAS) is a new technology in which seismic energy detected, at high spatial and temporal resolution, using the propagation of laser pulses fiber‐optic cable. We show analyses from first glaciological borehole DAS deployment to measure englacial subglacial properties Store Glacier, fast‐flowing outlet Greenland Ice Sheet. record compressional shear waves 1,043 m‐deep vertical profiles, sampled 10 m detect transition isotropic anisotropic ice 84%...

Supraglacial lake drainage events influence Greenland Ice Sheet dynamics on hourly to interannual timescales. However, direct observations are rare, and, date, no in situ studies exist from fast-flowing sectors of the ice sheet. Here, we present a rapid event at Store Glacier, west Greenland, 2018. The transported 4.8 <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mo>×</mml:mo> </mml:math> 10 6 m 3 meltwater glacier bed <mml:mo>∼</mml:mo> 5 h, reducing third...

Abstract Surface crevasses on the Greenland Ice Sheet (GrIS) capture nearly half of seasonal runoff, yet their role in transferring meltwater to bed has received little attention relative that supraglacial lakes and moulins. Here, we present observations crevasse ponding investigate controls hydrological behavior at a fast‐moving, marine‐terminating sector GrIS. We map surface meltwater, crevasses, surface‐parallel stress across ∼2,700 km 2 region using satellite data contemporaneous...

High-resolution observations from a 1043-m-deep borehole show highly variable ice properties and heterogeneous deformation.

Subglacial drainage systems exert control on glacier motion; however, the nature and evolution of these are not well established. Here, we report co-evolving state friction, water pressure flows at base Sermeq Kujalleq (Store Glacier), a fast-moving in west Greenland. Seismic records from centreline location major subglacial axis show stick-slip impulsive events (icequakes) to be far more frequent winter than summer. In contrast, amplitude low-frequency tremor low but high Additional insight...

Abstract Optical televiewer borehole logging within a crevassed region of fast‐moving Store Glacier, Greenland, revealed the presence 35 high‐angle planes that cut across background primary stratification. These were composed bubble‐free layer refrozen ice, most which hosted thin laminae bubble‐rich “last frozen” consistent with being traces former open crevasses. Several such last‐frozen observed in four traces, suggesting multiple episodes crevasse reactivation. The frequency generally...

We present relatively relocated earthquake hypocentres for >1000 microearthquakes (ML < 3) that occurred during the 2 weeks immediately prior to 2010 March 20 fissure eruption at Fimmvörðuháls on flank of Eyjafjallajökull volcano in Iceland. Our hypocentre locations lie predominantly horizontally separated clusters spread over an area 10 km2 and approximately 4 km below sea level (5 surface). Seismic activity final d preceding extended shallower levels <2 propagated surface site day started....

Abstract Subglacial hydrology modulates basal motion but remains poorly constrained, particularly for soft-bedded Greenlandic outlet glaciers. Here, we report detailed measurements of the response subglacial water pressure to connection and drainage adjacent water-filled boreholes drilled through kilometre-thick ice on Sermeq Kujalleq (Store Glacier). These provide evidence gap opening at ice-sediment interface, Darcian flow sediment layer, forcing in hydraulically-isolated cavities by...

Surface crevasses on the Greenland Ice Sheet capture nearly half of seasonal runoff, yet their role in transferring meltwater to bed has received little attention compared that supraglacial lakes and moulins. Here, we present observations crevasse ponding investigate controls hydrological behaviour at a fast-moving, marine-terminating sector Sheet. We map surface meltwater, crevasses, surface-parallel stress across ~2,700 km² region using satellite data contemporaneous uncrewed aerial...

Subglacial hydrology modulates basal motion but remains poorly constrained, particularly for soft-bedded Greenlandic outlet glaciers. Here, we report detailed measurements of the response subglacial water pressure to connection and drainage adjacent water-filled boreholes drilled through kilometre-thick ice on Sermeq Kujalleq (Store Glacier). These provide evidence gap opening at ice-sediment interface, Darcian flow sediment layer, forcing in hydraulically-isolated cavities by stress...

Optical televiewer borehole logging within a crevassed region of fast-moving Store Glacier, Greenland, revealed the presence 35 high-angle planes that cut across background primary stratification. These were composed bubble-free layer refrozen ice, most which hosted thin laminae bubble-rich ‘last frozen’ consistent with being traces former open crevasses. Several such last-frozen observed in four traces, suggesting multiple episodes crevasse reactivation. The frequency generally decreased...

Earth and Space Science Open Archive This work has been accepted for publication in Journal of Geophysical Research - Surface. Version RecordESSOAr is a venue early communication or feedback before peer review. Data may be preliminary. Learn more about preprints. preprintOpen AccessYou are viewing the latest version by default [v2]Controls on water storage drainage crevasses Greenland Ice SheetAuthorsThomas RussellChudleyiDPoulChristoffersenSamuel...

&amp;lt;p&amp;gt;Whilst marine-terminating glaciers in Greenland are significant contributors to global sea level rise, their thermodynamics poorly constrained by observations. Conventional discrete thermistor borehole sensing studies go some way addressing this but lack the spatial resolution effectively resolve key processes. Here, we detail results from fibre optic distributed temperature equipment installed a 1040 m hot water drilled 28 km inland of calving front Store Glacier,...

Optical televiewer borehole logging within a crevassed region of fast-moving Store Glacier, Greenland, revealed the presence 35 high-angle planes that cut across background primary stratification. These were composed bubble-free layer refrozen ice, most which hosted thin laminae bubble-rich ‘last frozen’ consistent with being traces former open crevasses. Several such last-frozen observed in four traces, suggesting multiple episodes crevasse reactivation. The frequency generally decreased...

Earth and Space Science Open Archive This work was has been accepted for publication in Geophysical Research Letters. Version of RecordESSOAr is a venue early communication or feedback before peer review. Data may be preliminary. Learn more about preprints. preprintOpen AccessYou are viewing the latest version by default [v1]Distributed Acoustic Sensing (DAS) Seismic Properties Borehole drilled on Fast-Flowing Greenlandic Outlet GlacierAuthors Adam D Booth iD Poul Christoffersen Charlotte...

&amp;lt;p&amp;gt;Investigating the physical conditions underlying and enabling fast glacier flow is crucial to understanding future stability of ice sheets, as well their impact on sea-level rise. Seismic surveys have been widely used measure material properties substrate, including seismic velocity structure, anisotropy, bed properties. While traditional rely natural seismicity or man-made sources such explosives, anthropogenic noise generated through ice-core drilling can also be a source....

We use cross-correlations of ambient seismic noise data between pairs 9 broadband three component seismometers to investigate variations in velocity structure and anisotropy the vicinity EastGRIP camp along across flow Northeast Greenland Ice Stream (NEGIS).From 9-component correlation tensors associated with all station we derive dispersion curves Rayleigh Love wave group velocities at frequencies from 1 25 Hz. The distributions exhibit for component. To better assess those variations,...