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TitleNear-surface geophysical techniques for geohazards investigations: Some Canadian examples
AuthorHunter, J A; Burns, R A; Good, R L; Pullan, S; Pugin, A; Crow, H
SourceThe Leading Edge vol. 29, no. 8, 2010 p. 936-947,
Alt SeriesEarth Sciences Sector, Contribution Series 20100070
Mediapaper; on-line; digital
File formatpdf
Subjectsgeophysics; engineering geology; geophysical surveys; geophysical interpretations; electromagnetic mapping; e m surveys; soil types; terrain sensitivity; terrain types; landslides; slope stability; slope deposits; slope failures; earthquake studies; earthquake risk; earthquakes; geological hazards
Illustrationslocation maps; profiles; logs
ProgramEastern Canada Geohazards Assessment Project, Public Safety Geoscience
AbstractOver the last 40 years, there has been an expansion of activity in applications of near-surface geophysical techniques for various types of geohazards investigations in Canada; numerous national and international research groups have been working with the Near Surface Geophysics Section of the Geological Survey of Canada to develop techniques for specific Canadian engineering and environmental geohazards problems. A few of the more interesting examples from widespread parts of the country are discussed in this paper.
Canada is a northern country that has a unique near-surface geological history as exemplified by its particular unconsolidated overburden and bedrock conditions. From the point of view of engineering geophysics, a thumbnail sketch of the relevant geological conditions is as follows:
The central part of the country contains a large expanse of PreCambrian rock (the so-called Precambrian Shield) where outcrops abound. Onlapping the Shield rocks are progressively younger rock, primarily Paleozoic and younger sedimentary rock. Mountain building can be found on eastern, western, and northern boundaries of the country. Earthquake activity is associated with all of these areas; however, the highest hazard associated with urban centers occurs in some areas of the west coast of British Columbia. A modest, but still significant, shaking hazard can be found in the Ottawa-St. Lawrence River lowlands.