Discovery Metadata System

Seismic reflection and refraction shot gathers from Korff Ice Rise, West Antarctica, 2015


GB/NERC/BAS/PDC/01970

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Summary

Abstract:
In 2015 a 3.7 km long seismic reflection profile was collected along the ice divide at Korff Ice Rise, West Antarctica, aiming to study basal conditions and englacial properties. Additionally, short refraction shot gathers were collected to study firn properties and constrain P-wave velocities in the firn. This dataset consists of the reflection and refraction data as a series of SEG-Y files.

This study is part of the British Antarctic Survey programme Polar Science for Planet Earth. All data were collected with the support of the British Antarctic Survey.

Keywords:
reflection, refraction, seismic, subglacial

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Citation

Agnew, R., Brisbourne, A., & Smith, A. (2025). Seismic reflection and refraction shot gathers from Korff Ice Rise, West Antarctica, 2015 (Version 1.0) [Data set]. NERC EDS UK Polar Data Centre. https://doi.org/10.5285/e9ed7128-eeed-4478-b308-8d1ea347dfa4

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REFERENCE MATERIALS

REFERENCE MATERIALS

RELATED DATA SET METADATA

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Constraints

Access Constraints:  None.
Use Constraints: Data supplied under Open Government Licence v3.0 http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/.

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Basic Information

Creation Date: 2024-12-13
Dataset Progress: Complete
Dataset Language: English
ISO Topic Categories:  
  • Geoscientific Information
  • Inland Waters
Parameters:
  • Cryosphere > Glaciers/Ice Sheets
  • Cryosphere > Glaciers/Ice Sheets > Glacier Facies
Personnel:
Name UK Polar Data Centre
Role(s) Metadata Author
Organisation British Antarctic Survey
   
Name Ronan Agnew
Role(s) Investigator, Technical Contact
Organisation British Antarctic Survey
   
Name Alex Brisbourne
Role(s) Investigator
Organisation British Antarctic Survey
   
Name Andrew M Smith
Role(s) Investigator
Organisation British Antarctic Survey
   
Parent Dataset: N/A

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Additional Information

Reference: Associated paper:
Agnew, R. S., Booth, A. D., Brisbourne, A. M., Clark, R. A., Livermore, P. W., & Smith, A. M. (2025). Subglacial conditions from converted-wave seismic reflection amplitudes: Synthetic experiments and case study reveal a frozen bed at an Antarctic ice rise. Journal of Geophysical Research: Earth Surface, 130, e2025JF008475. https://doi.org/10.1029/2025JF008475

References:

Agnew RS, Clark RA, Booth AD, Brisbourne AM, Smith AM (2023). Measuring seismic attenuation in polar firn: method and application to Korff Ice Rise, West Antarctica. Journal of Glaciology 1-12. https://doi.org/10.1017/jog.2023.82.

Agnew RS, Brisbourne AM, Clark RA, Smith AM, Livermore PW, Booth AD (2025) Subglacial conditions from converted-wave seismic reflection amplitudes: Synthetic experiments and case study at an Antarctic ice rise. In prep for submission to JGR: Earth Surface.
Quality: Reflection: 8000 Hz sample rate with GPS shot trigger timing; 24 bit recording
Refraction: 16000 Hz sample rate with GPS shot trigger timing
Lineage/Methodology: Reflection profile: Georods were deployed at intervals of 10 m. Receiver spreads were alternately at 30 m offset and split, with the shot point within the spread. Geometry is assigned in SEG-Y headers. No processing has been included. The source was 150 g Pentolite at 20 m depth.
Refraction gathers: Refrac 01 - 48 receivers, 10 m channel interval, 510 m offset. Source: 150 g Pentolite at surface.
Refrac 02 - 48 receivers, 10 m channel interval, 30 m offset. Source: 150 g Pentolite at surface.
Refrac 03 - 48 receivers,'expanding spread' geometry; i.e. channel interval 2.5 m to 390 m, progressively increasing receiver intervals: 2.5 m between 2.5 m and 20 m, 5 m between 20 and 50 m, and 10 m between 50 m and 390 m. The source was a seismic detonator at surface.

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Locality

Temporal Coverage:
Start Date 2015-01-01
End Date 2015-01-31
   
Spatial Coverage:
Latitude  
Southernmost -78.734
Northernmost -78.707
Longitude  
Westernmost -68.508
Easternmost -68.38
Altitude  
Min Altitude 358.2 m
Max Altitude 373.8 m
Depth  
Min Depth N/A
Max Depth N/A
   
Data Resolution:
Latitude Resolution N/A
Longitude Resolution   N/A
Horizontal Resolution Range N/A
Vertical Resolution Reflection: incidence < 80 m
Vertical Resolution Range N/A
Temporal Resolution N/A
Temporal Resolution Range N/A
   
Location:
Location Antarctica
Detailed Location   Korff Ice Rise

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Instrumentation

Sensor(s):
  • SEISMOGRAPHS
Data Collection: Seismic: Recorded on 2 x 24 channel Geometrics Geode with 48 x 40 Hz Georods.


Source:
Reflection: 150 g high explosive shots at 20 m depth.
Refraction: REFRAC_01, REFRAC_02: 150 g Pentolite at surface.
REFRAC_03: seismic detonator at surface.

Resolution:
Reflection: The normal incidence Fresnel zone is less than 80 m (minimum 150 Hz dominant frequency).

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Storage

Distribution:
Distribution Media Online Internet (HTTP)
Distribution Size N/A
Distribution Format  N/A
Fees N/A
   
Data Storage: Reflection: 31 files of IBM Real SEG-Y; 2 sec records, 8 kHz sampling, 48 channels, 10 m channel interval, geometry is assigned but no processing has been included. Shot gathers are alternately 30 m offset and split spread. Filename format is K01_XXXX.segy, where XXXX is the shot position along the line.
Refraction: 3 files of IBM real SEG-Y; 1 sec records; 48 channels, 16 kHz sampling.
K01_REFRAC_01.segy - 10 m channel interval, 510 m offset.
K01_REFRAC_02.segy - 10 m channel interval, 30 m offset.
K01_REFRAC_03.segy - 'expanding spread' geometry; i.e. channel interval 2.5 m to 390 m, progressively increasing receiver intervals: 2.5 m between 2.5 m and 20 m, 5 m between 20 and 50 m, and 10 m between 50 m and 390 m. Source: seismic detonator at surface.

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