Seismic bathymetry surveys of Subglacial Lake CECs, West Antarctica, 2016 and 2022

Subglacial Lake CECs was previously identified using radar profile data. Subglacial Lake CECs lies beneath 2650 m of ice, close to the Ellsworth Mountains at the divide between the Minnesota Glacier and Rutford and Institute Ice Streams in Antarctica. Four seismic reflection profiles were acquired across the lake to determine water column depth and investigate lake bed properties. Shot gathers with 48 channels and a maximum offset of 500 m were recorded. A seismic refraction experiment was undertaken to determine seismic velocities in the firn. Dual frequency and RTK GPS were used to determine shot locations. Seismic surveys indicate a maximum water depth of 301.3 +/- 1.5 m, at the widest part of the lake, with an estimated lake volume of 2.5 +/- 0.3 km3. Imaging of the ice-lake interface indicates topography with slopes of up to 1.9 degrees.

This research was supported by the Natural Environment Research Council, British Antarctic Survey (Polar Science for Planet Earth Programme) and Centro de Estudios Cientificos, Valdivia, Chile.

Alternate title: Polar Data Centre (PDC) record GB/NERC/BAS/PDC/01724

Date (Publication): 2023-03-28

Citation identifier: http://www.antarctica.ac.uk/dms/metadata.php?id= / GB/NERC/BAS/PDC/01724

Point of contact

Organisation name	Individual name	Electronic mail address	Role
British Antarctic Survey		pdc@bas.ac.uk	Custodian
NERC EDS UK Polar Data Centre	Brisbourne, A., Rivera, A., Zamora, R., Napoleoni, F., Smith, A., Ortega, M., & Uribe Parada, J.	pdc@bas.ac.uk	Originator

Maintenance and update frequency: Unknown

Keywords

NDGO0001

NERC OAI Harvesting

NERC_DDC

GCMD Parameter Valids

EARTH SCIENCE > Cryosphere > Glaciers/Ice Sheets
EARTH SCIENCE > Solid Earth > Seismology > Seismic Profile

BAS Free-text keywords

Antarctica
bathymetry
hydrology
seismic
subglacial lake

Use limitation: Data supplied under Open Government Licence v3.0 http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/.

Access constraints: Other restrictions

Other constraints: Data supplied under Open Government Licence v3.0 http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/.

Language: English

Topic category

Elevation
Geoscientific information
Inland waters

Begin date: 2022-01-14

End date: 2022-01-19

Reference system identifier: OGP / urn:ogc:def:crs:EPSG::4326

Distribution format

Distributor contact

Organisation name	Individual name	Electronic mail address	Role
Polar Data Centre - British Antarctic Survey		pdc@bas.ac.uk	Distributor

OnLine resource

Protocol	Linkage	Name
http		GET DATA

Hierarchy level: Dataset

Domain consistency

Measure identification: INSPIRE / Conformity_001

Conformance result

Title: INSPIRE Data Specification on unknown theme Guidelines

Date

Explanation: See the referenced specification

Pass: No

Statement: Due to a mis-fire, shot CECD_1440 was repeated with the new shot hole located 3 m offset from the original line towards the CECB line. The time interval between drilling to hole backfilling was only 45 minutes.

Similarly, shots CECB_1200 and CECB_1440 repeated as initial shot failed. Loaded and shot on the same day.

Seismic Reflection

Relative uncertainty in source locations is +/- 50 mm.

Relative uncertainty in receiver location is +/- 200 mm.

Absolute uncertainty in all positions is +/- 2 m.

Uncertainty in shot depth +/- 1 m but can be estimated from the surface ghost.

Seismic Refraction

Relative uncertainty in locations is +/- 25 mm to 50 m then +/- 200 mm onwards.