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TitleThe utilization of RADARSAT-1 imagery for the characterization of terrestrial impact landforms
AuthorSmith, S K; Grieve, R A F; Harris, J R; Singhroy, V H
SourceSpecial issue on the applications of RADARSAT-1 data in geology; by Singhroy, V H (ed.); Canadian Journal of Remote Sensing vol. 25, no. 3, 1999 p. 218-228,
Alt SeriesGeological Survey of Canada, Contribution Series 2003126
Alt SeriesEarth Sciences Sector, Contribution Series 20042812
PublisherInforma UK Limited
Mediapaper; on-line; digital
File formatpdf
ProvinceQuebec; Nunavut; Newfoundland and Labrador
NTS13M; 14D; 21M; 22N; 34B; 58H
AreaMistastin; Charlevoix; Lac à l'Eau Claire; Manicouagan; Devon Island; Haughton
Lat/Long WENS -92.0000 -88.0000 76.0000 75.0000
Lat/Long WENS -76.0000 -62.0000 57.0000 52.0000
Subjectsgeophysics; extraterrestrial geology; structural geology; geophysical surveys; geophysical interpretations; radar imagery; satellite imagery; craters; meteorite craters; erosion; RADARSAT-1; Manicouagan Impact Structure; Haughton Astrobleme
Illustrationslocation maps; satellite images; tables; sketch maps; digital elevation models
Released2014 07 31
AbstractFive large complex terrestrial impact structures were examined to determine the utility of RADARSAT-1 data to analyze these landforms. All impact structures studied were readily apparent in the RADARSAT-1 data. In particular, the impact structures superimposed their own distinctive fracture patterns on the regional pattern, which results in the production of an isotropic pattern of fracturing in the interior crater floor and an exterior halo of radial and circumferential fracturing. It is apparent, however, that the depth and extent of erosion, and lithological variations, at individual impact structures have considerable effect on the overall appearance and the visibility of impact-related fracturing in the RADARSAT-1 data. The rim dimensions and extent of fracturing visible in the data are comparable to previous estimates based on field studies. In some cases, the RADARSAT-1 data can be used to assist in lithological mapping. For example, the impact melt rocks at the Manicouagan structure have a distinctive appearance in the radar data, due to their structural homogeneity and subsequent effects of glaciation. Lithological contact mapping with RADARSAT-1 data is also possible in the image of the Haughton structure on Devon Island, in the Canadian Arctic, as areas of different reflectivity correspond to geologic maps of the area. It is concluded that the RADARSAT-1 data does have utility in characterizing the terrestrial impact structures examined, but it is variable in both the features expressed, or emphasized, and as a synoptic mapping tool. In all cases, adequate confidence for interpretation of the radar data in structural/lithological mapping required additional knowledge, usually field based.

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