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Iceberg Harmonic Tremor, Seismometer Data, Antarctica

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Entry ID

NSIDC-0349

Summary

Seismometers were placed on a 25 km by 50 km iceberg called C16 in the Ross Sea, Antarctica, to identify the Iceberg harmonic Tremor (IHT) source mechanism and to understand the relevance of IHT to iceberg calving, drift and break-up. The seismic observations reveal that the IHT signal consists of extended episodes of stick-slip icequakes (typically thousands per hour) generated when the ice-cliff edges of two tabular icebergs rub together during glancing, strike/slip type iceberg collisions (e.g., between C16 and B15A). With the source mechanism revealed, IHT may provide a promising signal useful for the study of iceberg behavior and iceberg-related processes such as climate-induced ice-shelf disintegration.

Here, a single day of seismometer data for a single station on iceberg C16 is provided as an example of "a day in the life of an iceberg" for use by scientists and students wishing to know more about IHT. The station data is from C16 "B" site on C16's northeast corner, and the day is 27 December, 2003, a day when B15A struck C16 and caused an episode of tremor that was particularly easy to identify and understand.

This represents only a small fraction of the total data that exist for the seismic program on iceberg C16. The full data are archived at the IRIS data center (where seismic data is commonly archived). This one-day data set is to provide glaciologists with ready access to a good example of IHT that they can use for teaching and for demonstration purposes. Data are available in comma-delimited ASCII format and Matlab native mat files. Data are available via FTP.

Geographic Coverage

 

Spatial Coordinates:
N: -77°     S: -77°     E: 168°     W: 168°    

Data Set Citation

Dataset Creator: Douglas MacAyeal
Dataset Title: Iceberg Harmonic Tremor, Seismometer Data, Antarctica
Dataset Release Date: 2008-10-01
Dataset Release Place: Boulder, Colorado USA
Dataset Publisher: NSIDC: National Snow and Ice Data Center
Online Resource: http://nsidc.org/data/nsidc-0349.html
Dataset DOI: http://dx.doi.org/10.7265/N5445JD6

Temporal Coverage

Start Date: 2003-12-27
Stop Date: 2003-12-28

Location Keywords

  • CONTINENT ANTARCTICA

Science Keywords

  • Cryosphere Glaciers/Ice Sheets
  • Cryosphere Glaciers/Ice Sheets Icebergs
  • Cryosphere Sea Ice Icebergs
  • Cryosphere Sea Ice Sea Ice Motion
  • Cryosphere Snow/Ice Ice Motion
  • Oceans Sea Ice Icebergs
  • Oceans Sea Ice Sea Ice Motion
  • Terrestrial Hydrosphere Snow/Ice Ice Motion

Ancillary Keywords

  • Antarctica
  • Iceberg
  • Ross Ice Shelf
  • seismology
  • seismometer

ISO Topic Category (View Definitions)

  • Climatology/Meteorology/Atmosphere

Platform

  • FIELD INVESTIGATION
  • FIELD SURVEYS

Data Set Progress

complete

Originating Center

AGDC

Data Center

National Snow and Ice Data Center
Data Center URL: http://nsidc.org

Data Center Personnel

Name: NSIDC User Services
Phone: 1 303 492-6199
Fax: 1 303 492-2468
Email: nsidc@nsidc.org
Contact Address:

  • National Snow and Ice Data Center
  • CIRES, 449 UCB
  • University of Colorado

City: Boulder
Province or State: CO
Postal Code: 80309-0449
Country: USA

Antarctic Glaciological Data Center
Data Center URL: http://nsidc.org/agdc/

Data Center Personnel

Name: AGDC User Services
Phone: 1 303 492-6199 x
Fax: 1 303 492-2468 x
Email: nsidc@nsidc.org
Contact Address:

  • National Snow and Ice Data Center
  • CIRES, 449 UCB
  • University of Colorado

City: Boulder
Province or State: CO
Postal Code: 80309-0449
Country: USA

Distribution

Distribution Media: FTP
Distribution Size: 150 MB
Distribution Format: ASCII Text (.txt)

Personnel

Douglas Macayeal
Role: INVESTIGATOR
Phone: 1 773 702-8027
Email: drm7@midway.uchicago.edu
Contact Address:

  • Department of Geophysical Sciences
  • University of Chicago
  • 5734 S. Ellis Ave.

City: Chicago
Province or State: IL
Postal Code: 60637
Country: USA

Emile Okal
Role: INVESTIGATOR
Contact Address:

  • Northwestern University
  • Department of Earth and Planetary Sciences

City: Evanston
Province or State: Illinois
Postal Code: 60208-2150
Country: USA

Richard Aster
Role: INVESTIGATOR
Contact Address:

  • New Mexico Tech
  • Dept. of Earth & Environmental Science

City: Socorro
Province or State: New Mexico
Postal Code: 87801
Country: USA

Jeremy Bassis
Role: INVESTIGATOR
Contact Address:

  • University of California, San Diego
  • Institute for Geophysics and Planetary Physics, Scripps Institution of Oceanogra

City: La Jolla,
Province or State: California
Postal Code: 92093-0225
Country: USA

NSIDC User Services
Role: TECHNICAL CONTACT
Phone: 1 303 492-6199 x
Fax: 1 303 492-2468 x
Email: nsidc@nsidc.org
Contact Address:

  • National Snow and Ice Data Center
  • CIRES, 449 UCB
  • University of Colorado

City: Boulder
Province or State: CO
Postal Code: 80309-0449
Country: USA

Related URL

VIEW PROJECT HOME PAGE
AGDC Web site

VIEW PROJECT HOME PAGE
Antarctic Glaciological Data Center Web site

VIEW RELATED INFORMATION
Continuous GPS (static) Data from the Ross Ice Shelf, Antarctic

VIEW RELATED INFORMATION
Continuous GPS (static) Data from the Ross Ice Shelf, Antarctica

Reference

MacAyeal, D. R., E. A. Okal, R. C. Aster, and J. N. Bassis (2008), Seismic and hydroacoustic tremor generated by colliding icebergs, J. Geophys. Res., 113, F03011, doi:10.1029/2008JF001005.

Metadata Name and Version

Metadata Name: CEOS IDN DIF
Metadata Version: 9.7

Creation and Review Dates

DIF Creation Date: 2008-10-01
Last DIF Revision Date: 2013-03-18

Metadata Views

DIF Text-Only

Directory Interchange Format (DIF) in plain text

DIF XML

Directory Interchange Format (DIF) in Extensible Markup Language (XML)

FGDC HTML

U.S. Federal Geographic Data Committee (FGDC) Content Standard for Digital Geospatial Metadata (CSDGM)

ISO HTML

International Organization for Standardization (ISO) 19115:2003 Geographic Information Metadata

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