A broad-band seismometer (Guralp 40T, with Quanterra Q330 digitizer/baler) was operated at a site called "Nascent Iceberg" (located on the Ross Ice Shelf about 1 km north of a large rift expected to eventually break and produce the next iceberg from the Ross Ice Shelf) from November 2004 through November 2006. This instrument recorded during the October - May time period of each year when solar ... power was available to maintain battery voltage. The data collected consist of 3 channels (two horizontal, one vertical) sampled at both 100 Hz and at 1 Hz. The 100 Hz data is archived with the IRIS data archive program, and users may consult with IRIS about obtaining this data. Here, the 1 Hz signal (on 3 channels) is archived for convenience of glaciological users wishing to examine how sea-swell and other longer-period signals influence the Ross Ice Shelf.The data time series (1 Hz on 3 channels) are processed from "raw" instrument records to obtain ground (ice surface) motion (in 3 directions). Instrument response characteristics have been accounted for (by deconvolution) in the analysis required to obtain ground motion.
The raw 1 Hz data is also available (soon) at IRIS.
Originating Center: University of Chicago, United States Antarctic Program, National Science Foundation