INTEGRATED IMAGING OF JERS-1 AND ERS-1 SAR DATA FOR EARTHQUAKE 
TECTONIC INVESTIGATION OF THE NAHANNI EARTHQUAKE AREA IN 
NORTHWEST TERRITORIES, CANADA 
W.M. Moon!, V. Singhroy2, Roy Kuoda?, Maurice Lamontagn? and Y. Yamaguchi? 
1. Geophysics, The University of Manitoba, Winnipeg, Canada R3T 2N2 
2. Applications division, Canada Center for Remote Sensing, Ottawa, Canada K1A 0Y7 
3. Geological Survey of Japan, Tsukuba, Ibaraki, 305 Japan 
4. Seismology, Geological Survey of Canada, Ottawa, Canada K1A 0Y3 
ABSTRACT 
The Nahanni region, Northwest Territories, Canada is a remote area and has been seismically 
very active. As a collaborative research project, the investigation team acquired JERS-1 
SAR, ERS-1 SAR, SPOT and Landsat data in addition other geophysical data such as 
earthquake epicenter data for main shocks and af ter-shocks. Recently there have been several 
large earthquakes near the North Nahanni River including the ones on 5 October 1985 (Ms 
6.6), 23 December 1985 (Ms 6.9) and 25 March 1988 (Ms 6.2). The earthquakes occurred 
within a small relatively undeformed plateau, the Mackenzie Plain, in the Foreland Fold Belt 
created along the northeastern Cordillera during the Columbia or Laramide Orogeny. One of 
the problems in studying the geological and tectonic setting of the Nahanni epicentral region 
has been lack of comprehensive geological and geophysical data, perhaps due to remote 
isolation and logistic difficulties in accessing the study area. In this study an attempt was 
made to use space-borne L- and C-band SAR digital image and optical (Landsat and SPOT) 
image data to compliment other available information. Detailed investigation of the surface 
structural features of individual as well as the final integrated composite images over the 
epicentral area indicates that there are several new structural features intersecting the major 
northwest trending Iverson thrust fault and accompanying structures at the earthquake 
epicentral region. 
KEY WORDS : SAR, Geological Remote Sensing, Earthquake, Integration 
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