Hofstede, Coen Matthijs (2022): Seismic reflection data show a local sedimentation bedform at the subglacial trough system of Isunnguata Sermia, West Greenland, September 2013 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.949168
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Abstract:
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.
Supplement to:
Hofstede, Coen Matthijs; Wilhelms, Frank; Neckel, Niklas; Fritzsche, Diedrich; Beyer, Sebastian; Hubbard, Alun L; Pettersson, Rickard; Eisen, Olaf (2023): The Subglacial Lake That Wasn't There: Improved Interpretation From Seismic Data Reveals a Sediment Bedform at Isunnguata Sermia. Journal of Geophysical Research: Earth Surface, 128(10), e2022JF006850, https://doi.org/10.1029/2022JF006850
Project(s):
ice2sea (ice2sea)
Funding:
Coverage:
Median Latitude: 67.029881 * Median Longitude: -48.624580 * South-bound Latitude: 67.011055 * West-bound Longitude: -48.680343 * North-bound Latitude: 67.055912 * East-bound Longitude: -48.567941
Date/Time Start: 2013-09-22T00:00:00 * Date/Time End: 2013-09-24T00:00:00
Minimum Elevation: 1353.0 m * Maximum Elevation: 1398.0 m
Event(s):
AWI-20130521 * Latitude Start: 67.034293 * Longitude Start: -48.680343 * Latitude End: 67.032728 * Longitude End: -48.567941 * Date/Time: 2013-09-22T00:00:00 * Elevation Start: 1363.0 m * Elevation End: 1398.0 m * Method/Device: Seismic reflection profile (SEISREFL) * Comment: along-flow profile
AWI-20130522 * Latitude Start: 67.055912 * Longitude Start: -48.621948 * Latitude End: 67.011055 * Longitude End: -48.626450 * Date/Time: 2013-09-23T00:00:00 * Elevation Start: 1367.0 m * Elevation End: 1353.0 m * Method/Device: Seismic reflection profile (SEISREFL) * Comment: across flow profile
AWI-20130532 * Latitude Start: 67.033000 * Longitude Start: -48.624600 * Latitude End: 67.012300 * Longitude End: -48.626200 * Date/Time: 2013-09-24T00:00:00 * Elevation Start: 1363.0 m * Elevation End: 1353.0 m * Method/Device: Seismic reflection profile (SEISREFL) * Comment: amplitude versus offset across-flow profile
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | Hofstede, Coen Matthijs | |||
| 2 | Profile | Profile | Hofstede, Coen Matthijs | Profile / dataset | ||
| 3 | File content | Content | Hofstede, Coen Matthijs | |||
| 4 | Binary Object | Binary | Hofstede, Coen Matthijs | |||
| 5 | Binary Object (File Size) | Binary (Size) | Bytes | Hofstede, Coen Matthijs | ||
| 6 | Comment | Comment | Hofstede, Coen Matthijs | Figure in Hofstede et al. (2023) |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Basic curation (CurationLevelB) * Processing Level: PANGAEA data processing level 3 (ProcLevel3)
Size:
46 data points
Data
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| 1 Event | 2 Profile | 3 Content | 4 Binary | 5 Binary (Size) [Bytes] | 6 Comment |
|---|---|---|---|---|---|
| README | README_20130521_522_532.txt | 3.6 kBytes | |||
| AWI-20130521 | along-flow profile | raw shots with geometry | 20130521.segy | 437.2 MBytes | |
| AWI-20130521 | along-flow profile | trace edited, static corrected shots | 20130521_EDITS.segy | 394.5 MBytes | |
| AWI-20130521 | along-flow profile | band-pass (BP,30-550 Hz) filtered, spiking deconvoluted stack | 20130521_DCstack.segy | 223.7 MBytes | Figure 4c |
| AWI-20130521 | along-flow profile | Post stack, Kirchhoff time migrated profile | 20130521_TXmig_v1.segy | 223.7 MBytes | Figure 4a |
| AWI-20130522 | across flow profile | raw shots with geometry | 20130522.segy | 340.1 MBytes | |
| AWI-20130522 | across flow profile | trace edited, static corrected shots | 20130522_EDITS.segy | 332.3 MBytes | |
| AWI-20130522 | across flow profile | band-pass (BP,30-550 Hz) filtered, spiking deconvoluted stack | 20130522_DCstack.segy | 228.3 MBytes | Figure 3c |
| AWI-20130522 | across flow profile | Post stack, Kirchhoff time migrated profile | 20130522_TXmig_v2.segy | 228.3 MBytes | Figure 3a |
| AWI-20130532 | AVO dataset | raw shots with geometry | 20130532.segy | 236.3 MBytes | |
| AWI-20130532 | AVO dataset | 9 BP filtered shots offset 0-1790 m increasing in 200 m steps. shot7 misfire | 20130532_BP.segy | 101.6 MBytes | Figure 5 |
| AWI-20130521 | Navigation datasets | latitude, longitude, utmn, utme, elevation | 20130521_sps_WGS84_UTM.txt | 4.7 kBytes | |
| AWI-20130522 | Navigation datasets | latitude, longitude, utmn, utme, elevation | 20130522_sps_WGS84_UTM.txt | 3.6 kBytes | |
| AWI-20130532 | Navigation datasets | utme, utmn, elevation | 20130532_sps_UTM.txt | 1.2 kBytes |