Author:
Buchbinder G. G. R.,Anglin F. M.,McNicoll Roger
Abstract
The construction of a rock and earth-filled dam in the La Grande River valley, Quebec has created a hydroelectric reservoir with a maximum depth of 145 m and a volume of 61.7 × 109 m3. No seismicity in this Precambrian Shield region above magnitude 0.1 was observed in the reservoir zone in the 27 months preceding the filling. Microearthquakes of magnitude less than 1 started under the reservoir when a water depth of 90 m was reached after 30 days and this activity continued for about 3 months. A second series of microearthquakes began in the same active zone when the rate of filling increased twofold. The seismically active area is confined to a zone 4 km × 7 km and no deeper than 5 km. The microearthquakes are considered to be the result of minor reactivation of old faults under the reservoir in response to the increased pore pressure.
Publisher
Canadian Science Publishing
Subject
General Earth and Planetary Sciences
Cited by
7 articles.
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