Entry_ID: NSIDC-0349
Entry_Title: Iceberg Harmonic Tremor, Seismometer Data, Antarctica
Group: 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
End_Group
Group: Personnel
   Role: Investigator
   First_Name: Douglas
   Middle_Name: R.
   Last_Name: MacAyeal
   Email: drm7@uchicago.edu
   Phone: 1 773 752-6078 x
   Fax: 773 702  9509 x
   Group: Contact_Address
      Address: University of Chicago
      Address: Geophysical Sciences
      Address: Department of Geophysical Sciences
      Address: University of Chicago
      Address: 5734 S. Ellis Ave.
      City: Chicago
      Province_or_State: IL
      Postal_Code: 60637
      Country: USA
   End_Group
End_Group
Group: Personnel
   Role: Investigator
   First_Name: Emile
   Last_Name: Okal
   Group: Contact_Address
      Address: Northwestern University
      Address: Department of Earth and Planetary Sciences
      City: Evanston
      Province_or_State: Illinois
      Postal_Code: 60208-2150
      Country: USA
   End_Group
End_Group
Group: Personnel
   Role: Investigator
   First_Name: Richard
   Last_Name: Aster
   Group: Contact_Address
      Address: New Mexico Tech
      Address: Dept. of Earth & Environmental Science
      City: Socorro
      Province_or_State: New Mexico
      Postal_Code: 87801
      Country: USA
   End_Group
End_Group
Group: Personnel
   Role: Investigator
   First_Name: Jeremy
   Last_Name: Bassis
   Group: Contact_Address
      Address:  University of California, San Diego
      Address: Institute for Geophysics and Planetary Physics, Scripps Institution of Oceanogra
      City: La Jolla,
      Province_or_State: California
      Postal_Code: 92093-0225
      Country: USA
   End_Group
End_Group
Group: Personnel
   Role: Technical Contact
   First_Name: NSIDC
   Last_Name: User Services
   Email: nsidc@nsidc.org
   Phone: 1 303 492-6199 x
   Fax: 1 303  492-2468 x
   Group: Contact_Address
      Address: National Snow and Ice Data Center
      Address: CIRES, 449 UCB
      Address: University of Colorado
      City: Boulder
      Province_or_State: CO
      Postal_Code: 80309-0449
      Country: USA
   End_Group
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Cryosphere
   Term: Glaciers/Ice Sheets
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Cryosphere
   Term: Glaciers/Ice Sheets
   Variable_Level_1: Icebergs
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Cryosphere
   Term: Sea Ice
   Variable_Level_1: Icebergs
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Cryosphere
   Term: Sea Ice
   Variable_Level_1: Sea Ice Motion
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Cryosphere
   Term: Snow/Ice
   Variable_Level_1: Ice Motion
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Oceans
   Term: Sea Ice
   Variable_Level_1: Icebergs
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Oceans
   Term: Sea Ice
   Variable_Level_1: Sea Ice Motion
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Terrestrial Hydrosphere
   Term: Snow/Ice
   Variable_Level_1: Ice Motion
End_Group
ISO_Topic_Category: Climatology/Meteorology/Atmosphere
Keyword: Antarctica
Keyword: Iceberg
Keyword: Ross Ice Shelf
Keyword: seismology
Keyword: seismometer
Source_Name: FIELD INVESTIGATION
Source_Name: FIELD SURVEYS
Group: Temporal_Coverage
   Start_Date: 2003-12-27
   Stop_Date: 2003-12-28
End_Group
Data_Set_Progress: complete
Group: Spatial_Coverage
   Southernmost_Latitude: -77
   Northernmost_Latitude: -77
   Westernmost_Longitude: 168
   Easternmost_Longitude: 168
End_Group
Group: Location
   Location_Category: CONTINENT
   Location_Type: ANTARCTICA
End_Group
Data_Set_Language: English
Originating_Center: AGDC
Group: Data_Center
   Data_Center_Name: NSIDC > National Snow and Ice Data Center
   Data_Center_URL: http://nsidc.org
   Group: Personnel
      Role: Data Center Contact
      First_Name: NSIDC
      Last_Name: User Services
      Email: nsidc@nsidc.org
      Phone: 1 303 492-6199 
      Fax: 1 303  492-2468 
      Group: Contact_Address
         Address: National Snow and Ice Data Center
         Address: CIRES, 449 UCB
         Address: University of Colorado
         City: Boulder
         Province_or_State: CO
         Postal_Code: 80309-0449
         Country: USA
      End_Group
   End_Group
End_Group
Group: Data_Center
   Data_Center_Name: AGDC > Antarctic Glaciological Data Center
   Data_Center_URL: http://nsidc.org/agdc/
   Group: Personnel
      Role: Data Center Contact
      First_Name: AGDC
      Last_Name: User Services
      Email: nsidc@nsidc.org
      Phone: 1 303 492-6199 x
      Fax: 1 303  492-2468 x
      Group: Contact_Address
         Address: National Snow and Ice Data Center
         Address: CIRES, 449 UCB
         Address: University of Colorado
         City: Boulder
         Province_or_State: CO
         Postal_Code: 80309-0449
         Country: USA
      End_Group
   End_Group
End_Group
Group: Distribution
   Distribution_Media: FTP
   Distribution_Size: 150 MB
   Distribution_Format: ASCII Text (.txt)
End_Group
Group: 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.

End_Group
Group: 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.

End_Group
Group: Related_URL
   Group: URL_Content_Type
      Type: VIEW PROJECT HOME PAGE
   End_Group
   URL: http://nsidc.org/agdc/index.html
   Description: AGDC Web site
End_Group
Group: Related_URL
   Group: URL_Content_Type
      Type: VIEW PROJECT HOME PAGE
   End_Group
   URL: http://nsidc.org/agdc/index.html
   Description: Antarctic Glaciological Data Center Web site
End_Group
Group: Related_URL
   Group: URL_Content_Type
      Type: VIEW RELATED INFORMATION
   End_Group
   URL: http://nsidc.org/data/nsidc-0347.html
   Description: Continuous GPS (static) Data from the Ross Ice Shelf, Antarctic
End_Group
Group: Related_URL
   Group: URL_Content_Type
      Type: VIEW RELATED INFORMATION
   End_Group
   URL: http://nsidc.org/data/nsidc-0347.html
   Description: Continuous GPS (static) Data from the Ross Ice Shelf, Antarctica
End_Group
IDN_Node: AMD/US
Metadata_Name: CEOS IDN DIF
Metadata_Version: 9.7
DIF_Creation_Date: 2008-10-01
Last_DIF_Revision_Date: 2013-03-18
DIF_Revision_History:  Added DOI