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  • 1
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    Variable extent of anisotropic ice and soft sediment in the basal zone of Store Glacier (2018)
    PANGAEA
    In:  Supplement to: Hofstede, Coen Matthijs; Christoffersen, Poul; Hubbard, Bryn; Doyle, Samuel H; Young, Tun Jan; Diez, Anja; Eisen, Olaf; Hubbard, Alun L (2018): Physical Conditions of Fast Glacier Flow: 2. Variable Extent of Anisotropic Ice and Soft Basal Sediment From Seismic Reflection Data Acquired on Store Glacier, West Greenland. Journal of Geophysical Research-Earth Surface, 123(2), 349-362, https://doi.org/10.1002/2017JF004297
    Details
    Publication Date: 2023-03-16
    Description: Added are 5 seismic reflection data sets of Store Glacier, a tide water glacier in West Greenland Uummannaq Fjord. Two crossing profiles were recorded, 20140513, along the ice flow and 20140514, across the ice flow.
    Keywords: AWI_Glac; File content; File format; File name; File size; Glaciology @ AWI; Seismic reflection profile; SEISREFL; Store_Glacier; Uniform resource locator/link to file; West Greenland
    Type: Dataset
    Format: text/tab-separated-values, 25 data points
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  • 2
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    Seismic data from Colle Gnifetti glacie saddle around borehole KCI, Swiss Alps
    PANGAEA
    In:  Supplement to: Diez, Anja; Eisen, Olaf; Hofstede, Coen Matthijs; Bohleber, Pascal; Polom, Ulrich (2013): Joint interpretation of explosive and vibroseismic surveys on cold firn for the investigation of ice properties. Annals of Glaciology, 54(64), 201-210, https://doi.org/10.3189/2013AoG64A200
    Details
    Publication Date: 2023-06-27
    Description: Two seismic surveys were carried out on the high-altitude glacier saddle, Colle Gnifetti, Monte Rosa, Italy/Switzerland. Explosive and vibroseismic sources were tested to explore the best way to generate seismic waves to deduce shallow and intermediate properties (〈100 m) of firn and ice. The explosive source (SISSY) excites strong surface and diving waves, degrading data quality for processing; no englacial reflections besides the noisy bed reflector are visible. However, the strong diving waves are analyzed to derive the density distribution of the firn pack, yielding results similar to a nearby ice core. The vibrator source (ElViS), used in both P- and SH-wave modes, produces detectable laterally coherent reflections within the firn and ice column. We compare these with ice-core and radar data. The SH-wave data are particularly useful in providing detailed, high-resolution information on firn and ice stratigraphy. Our analyses demonstrate the potential of seismic methods to determine physical properties of firn and ice, particularly density and potentially also crystal-orientation fabric.
    Keywords: Colle_Gnifetti_KCI; Colle Gnifetti, Monte Rosa, Swiss Alps; File content; File size; ICEDRILL; Ice drill; Method comment; Uniform resource locator/link to sgy data file
    Type: Dataset
    Format: text/tab-separated-values, 28 data points
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  • 3
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    An update to Greenland and Antarctic ice sheet topography, cavity geometry, and global bathymetry (RTopo-2.0.4) (2019)
    PANGAEA
    In:  Supplement to: Schaffer, Janin; Kanzow, Torsten; von Appen, Wilken-Jon; von Albedyll, Luisa; Arndt, Jan Erik; Roberts, David H (2020): Bathymetry constrains ocean heat supply to Greenland's largest glacier tongue. Nature Geoscience, 13(3), 227-231, https://doi.org/10.1038/s41561-019-0529-x
    Details
    Publication Date: 2023-11-24
    Description: As an update to the RTopo-2.0.1 data set (https://doi.org/10.1594/PANGAEA.856844), RTopo-2.0.4 contains new original bathymetry data for the Northeast Greenland continental shelf. In the Southern Ocean, we added the Rosier et al. (JGR Oceans, 2018) bathymetry grid below Filchner Ice Shelf. This work was supported in part through the Deutsche Forschungsgemeinschaft (DFG) within the Special Priority Program (SPP) 1889 "Regional Sea Level Change and Society" (grant OGreen79), the German Federal Ministry for Education and Research (BMBF) within the GROCE project (Grant 03F0778A), the Natural Environment Research Council (NERC) large grant "Ice shelves in a warming world: Filchner Ice Shelf System" (NE/L013770/1), the NERC project "Greenland in a warmer climate: What controls the advance & retreat of the NE Greenland Ice Stream" (Grant NE/N011228/1), and the Helmholtz Climate Initiative "Regional Climate Change" (REKLIM).
    Keywords: AWI_PhyOce; File format; File name; File size; Greenland - Ice Sheet/Ocean Interaction: From process understanding to an analysis of the regional system; Greenland in a warmer climate: What controls the advance & retreat of the NE Greenland Ice Stream; GROCE; Helmholtz-Verbund Regionale Klimaänderungen = Helmholtz Climate Initiative (Regional Climate Change); Ice shelves in a warming world: Filchner Ice Shelf System; NERC_FISS; NERC_Greenland; Physical Oceanography @ AWI; Priority Programme 1889 Regional Sea Level Change and Society; REKLIM; RTopo; RTopo-2; SPP1889; Uniform resource locator/link to file
    Type: Dataset
    Format: text/tab-separated-values, 56 data points
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  • 4
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    Sea floor bathymetry under Ekström Ice Shelf, Antarctica, from a compilation of seismic vibroseis data (2019)
    PANGAEA
    Details
    Publication Date: 2024-01-30
    Description: A gridded bathymetry of the sea floor under Ekström Ice Shelf, Antarctica. The seismic data used to map the bathymetry were collected between 2010 and 2018, using two different seismic vibroseis sources. The same snow streamer was used for all data acquisition - a 1500 m long, 60 channel snow streamer, with 25 m group spacing. Each group contains eight gimballed P-wave SM-4, 14 Hz geo-phones. For each seismic profile, the reflection time of the sea floor horizon was identified. The data across all profiles was gridded and depth converted, using an ice velocity of 3601 m/s a sea-water velocity of 1451 m/s.
    Keywords: Bathymetry; Ekström; Ekstrom_Ice_Shelf; Ekström Ice Shelf; Ice shelf; MULT; Multiple investigations; seismic reflection; Sub-EIS-Obs; vibroseis
    Type: Dataset
    Format: image/tiff, 21.5 MBytes
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  • 5
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    Sea floor depth under Ekström Ice Shelf, Antarctica, from seismic vibroseis surveys 2010-2018 (2021)
    PANGAEA
    Details
    Publication Date: 2024-01-30
    Description: Sea floor depth under Ekström Ice Shelf, Antarctica - from seismic reflection profiles collected between 2010 and 2018. For each seismic profile, the reflection time of the sea floor and ice-shelf base was identified and the depth to the sea floor was calculated using an ice velocity of 3601 m/s a sea-water velocity of 1451 m/s. The depths are referenced to mean sea-level (geoid EIGEN-6C4 ). The seismic data used here were collected using two different seismic vibroseis sources. The same snow streamer was used for all data acquisition - a 1500 m long, 60 channel snow streamer, with 25 m group spacing. Each group contains eight gimballed P-wave SM-4, 14 Hz geo-phones. Please note these data are the point data used to create the gridded bathymetry product of the region, found here: doi:10.1594/PANGAEA.907951 Details of data acquisition and processing are given here: doi:10.1029/2019GL086187.
    Keywords: Bathymetry; Bed elevation; Corrected for surface elevation using the REMA model, re-reference to the EIGEN6C4 Geoid; Ekström; Ekstrom_Ice_Shelf; Ekström Ice Shelf; Ice shelf; LATITUDE; LONGITUDE; MULT; Multiple investigations; Number; seismic reflection; Sub-EIS-Obs; vibroseis
    Type: Dataset
    Format: text/tab-separated-values, 117684 data points
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  • 6
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    Seismic reflection data of a basal channel and ocean cavity at the ice shelf-grounding line area of Support Force Glacier, Filchner Ice Shelf, Antarctica (2021)
    PANGAEA
    Details
    Publication Date: 2024-04-20
    Description: Support Force Glacier (SFG) is a large ice stream feeding into the Filchner Ice Shelf. The active seismic survey is recorded at the sheet-shelf transition of SFG. We map the bed while grounded, the ocean cavity around a surface channel at the ice shelf and its counterpart at the base, the basal channel, and the seabed. The survey consists of 5 seismic reflection profiles, 2 along-flow profiles and 3 across-flow profiles. The 2.42GB seismic data were recorded with a 300 m long streamer consisting of 96 30Hz p-wave sensors. The sample rate is 0.5 ms, record length 3000 ms. The data is single fold, shot spacing is 150 m: line name: profile TC paper: direction: #shots: - 20170501 profile I along-flow 291 shots - 20170502 profile III across-flow 28 shots - 20170503 profile II along-flow 71 shots - 20170504 profile IV across-flow 40 shots - 20170506 profile V across-flow 50 shots Presented are for each line (20170501 used as example): - The raw shots: 20170501_RAW_SHOTS_EDITS_GEOM.segy - The Kirchhoff migrated and depth converted profiles: 20170501stat_TXmig_Zconv.segy - The shot x,y,z coordinates in longitude, latitude and surface height in meters above sea level (z, WGS84 ellipsoid): 20170501_GPS.txt
    Keywords: 300 m snow streamer with 96 gimballed 30 Hz vertical compressional wave (P-wave) sensors; ANT-Land_2016/17_FISP; AWI Antarctic Land Expedition; Binary Object; Binary Object (File Size); Event label; Filchner Ice Shelf Project; File content; FISP; FISP_2016-2017_20170501; FISP_2016-2017_20170502; FISP_2016-2017_20170503; FISP_2016-2017_20170504; FISP_2016-2017_20170506; Ice-shelf Channels; profile I; profile II; profile III; profile IV; profile V; Snow streamer; SSTREAM
    Type: Dataset
    Format: text/tab-separated-values, 54 data points
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  • 7
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    Three component shallow seismic mini-vibrator data of polar firn of Kohnen Station, East Antarctica (2021)
    PANGAEA
    Details
    Publication Date: 2024-04-20
    Description: In 2012 we performed an active seismic experiment at Kohnen Station, (S 75.0041, E 0.0637), Antarctica. We recorded two perpendicular seismic profiles. The source was a minivibrator (ELVIS, wheelbarrow sized) producing a 30-240 Hz, 10 s linear sweep. The receivers were 24 3-component spiked geophones place at 10 m (parallel line 20120553) or 5 m separation (perpendicular line 20120554). The first arrivals from the diving wave of the correlated sweep records were used to derive elastic modeli from the firn. We present the raw uncorrelated sweeps, the correlated sweeps and stacks used in the publication Schlegel, R. et al. (2019).
    Keywords: 20120553, 20120554; Binary Object; Binary Object (File Size); Comment; diving wave; East Antarctica, Kohnen station; File content; firn; Kohnen_based; Kohnen_seismic_2012; Kohnen Station; p-wave; SEIS; Seismic; s-wave; vibroseis
    Type: Dataset
    Format: text/tab-separated-values, 417 data points
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  • 8
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    Seismic reflection data show a local sedimentation bedform at the subglacial trough system of Isunnguata Sermia, West Greenland, September 2013 (2022)
    PANGAEA
    Details
    Publication Date: 2024-04-20
    Description: To check the possible presence of a subglacial lake in Isunnguata Sermia, West Greenland we collected two 5 km perpendicular profiles of seismic reflection data. The data revealed a 1.9 km by 450 m and 50 m thick lens-shaped body at the bottom of a subglacial 190 m deep trough, most likely consisting of stratified consolidated sediments possibly overlain by dilatant till. Liquid water seems present at the northern and eastern flank of the subglacial trough. The bed on the northern side of the trough consists of unconsolidated, possibly water containing sediments, whereas on the southern side it consists of more consolidated material.
    Keywords: AWI-20130521; AWI-20130522; AWI-20130532; Binary Object; Binary Object (File Size); Comment; Event label; File content; ice2sea; Profile; Seismic reflection profile; SEISREFL
    Type: Dataset
    Format: text/tab-separated-values, 46 data points
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