Geology topics

Research about Ross Sea

Source-linked reports with geographic coverage including Ross Sea.

4 recordsLinked to original sources

USGS2017

Landsat TM image maps of the Shirase and Siple Coast ice streams, West Antarctica

Fifteen 1: 250000 and one 1: 1000 000 scale Landsat Thematic Mapper (TM) image mosaic maps are currently being produced of the West Antarctic ice streams on the Shirase and Siple Coasts. Landsat TM images were acquired between 1984 and 1990 in an area bounded approximately by 78°-82.5°S and 120°- 160° W. Landsat TM bands 2, 3 and 4 were combined to produce a single band, thereby maximizing data content and improving the signal-to-noise ratio. The summed single band was processed with a combination of high- and low-pass filters to remove longitudinal striping and normalize solar elevation-angle effects. The images were mosaicked and transformed to a Lambert conformal conic projection using a cubic-convolution algorithm. The projection transformation was controled with ten weighted geodetic ground-control points and internal image-to-image pass points with annotation of major glaciological features. The image maps are being published in two formats: conventional printed map sheets and on a CD-ROM.

Annals of Glaciology↗

USGS2007

Regional seismic stratigraphic correlations of the Ross Sea: Implications for the tectonic history of the West Antarctic Rift System

Using existing and new seismic reflection data, new and updated correlations of late Oligocene-early Miocene RSS-2 strata were made between the southern parts of Ross Sea basins. Previous studies documented Cretaceous extension across much of Ross Sea. We interpret that Cenozoic extension also occurred across Ross Sea. Subsidence during and following this extension deepened existing basins and may have initiated basins in the west, subsiding ridges between basins below sea level during the late Oligocene. Pre-Oligocene strata record cessation of L. Cretaceous extension in easternmost Ross Sea. Successively younger Cenozoic extension occurred from east to west across the rest of Ross Sea.

Open-File Report↗

USGS1992

Gravity modelling across the Transantarctic Mountains, Northern Victoria Land

During GANOVEX V and GANOVEX VI, new gravity data were collected in northern Victoria Land. The GANOVEX V data cover the Mt. Melbourne 1:250.000 quadrangle, while the GANOVEX VI data Transantarctic Mountains south of the Drygalski Ice Tongue. The two data sets are connected by a coastal traverse. The measurements were constrained by satellite-positioned elevation (GPS) data and, in some cases, ice depth radar echo-sounding. Complete Bouguer corrections have been attempted to compensate for the effects of rugged terrain and surrounding ice. In the Mt. Melbourne quadrangle the regional gravity gradient is uniform, decreasing inland by 2.0 mgal/km. South of the Drygalski Ice Tongue the regional gradient is 3.0 mgal/km but becomes flat and variable inland over Beacon Supergroup rocks. Both profiles are consistent with a flexural uplift crustal model. A coast-parallel gravity profile reveals a long-wavelength anomaly of approximately 100 mgal amplitude, which is likely caused by a deep seated source. Gravity models suggest that crustal thickening on the order of 5.0 km to 5.5 km at the coastline between Terra Nova Bay and the region south of the ice tongue could account for the coastal anomaly. The increase in thickness might lie across two "domains" of different uplift, or perhaps in some way be related to a structure dating from the time of the Gondwana breakup.

Book chapter↗

USGS1987

Recording and processing procedures for multi-channel seismic-reflection data collected in the western Ross Sea, Antarctica

During 1984, over 2300 km of multichannel seismic-reflection data were recorded by the U.S. Geological Survey in the western Ross Sea and Iselin Bank regions. A temporary loss and sinking of the streamer led to increasing the streamer tow depth to 20 m, which resulted in some attenuation of frequencies in the 30-50 Hz range but no significant difference in resolution of the stacked data. Severe water bottom multiples were encountered and removed by dip-filtering, weighted stacking, and severe post-NMO muting.

Book chapter↗