Iceberg Harmonic Tremor, Seismometer Data, AntarcticaEntry ID: NSIDC-0349
Abstract: 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.
Data Set Citation
Dataset Originator/Creator: MacAyeal, D. R., E. Okal, R. Aster, and J. Bassis.
Dataset Title: Iceberg Harmonic Tremor, Seismometer Data, Antarctica
Dataset Series Name: NSIDC-0349
Dataset Release Date: 2008-10-01
Dataset Release Place: Boulder, Colorado USA
Dataset Publisher: NSIDC: National Snow and Ice Data Center
Dataset DOI: doi:10.7265/N5445JD6Online Resource: http://www.usap-dc.org/view/dataset/609349
Start Date: 2003-12-27Stop Date: 2003-12-28
Data Set Progress
Distribution Media: FTP
Distribution Size: 150 MB
Distribution Format: ASCII Text (.txt)
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.
Extended Metadata Properties
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Creation and Review Dates
DIF Creation Date: 2008-10-01
Last DIF Revision Date: 2017-08-23