CGRG Bibliography of Canadian Geomorphology
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Author : Adams, J.; Bent, A.; Drysdale, J. A.; Halchuk, S.; Lamontagne, M.; Ma, S.; Wetmiller, R. J.; Woodgold, C.; and Dastous, J.-B.
Date : 2000.
Title : The 01 January 2000 Kipawa Earthquake (MN=5.2) and its relation to the 1935 MS=6.2 Timiskaming Earthquake.
Publication : 96th Annual Meeting of the Seismological Society of America, 9-12 April, Scripps Institution of Oceanography/University of California, San Diego, California.
Issue :
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Abstract
The Kipawa earthquake (mN=5.2 OTT; mb=4.5 pIDC) occurred 01 January 2000 at 11:22:57 UT (6:22 EST), shortly after the Y2K roll-over. All GSC computer systems functioned properly. The epicentre (46.88N 78.92W) was under Lac Kipawa about 10 km north of the town of Temiscaming, Quebec and effects were felt to distances of about 500 km. The "Felt Earthquake" form on the GSC Web pages has received more than 550 submissions from 170+ communities, to date. The shaking was very strong for residents within 50 km of the epicentre (intensity MM VI), and minor damage (fallen light objects, one broken ventilation pipe, and cracks in plaster) was reported. The seismograph EEO (Eldee, Ontario, 29 km) recorded a 0.023g vertical acceleration and a digital strong motion unit operated by Hydro-Quebec at 68 km distance recorded about 0.014g horizontal acceleration.As of 15 January 2000 there were just 17 aftershocks, ranging from ML -1.1 to mN 2.2. To supplement station EEO two portable recorders and a digital strong motion instrument were installed on 02 January 2000 at approximately 9 to 22 km epicentral distance. Preliminary analysis for the mainshock, from P-nodal and surface wave modelling, indicates thrust faulting on E-W or SE-NW trending planes and a depth of 13-16 km. The epicentre is within 15 km of that of the magnitude 6.2, 1935 Timiskaming earthquake, and lies in a cluster of 76 located earthquakes since 1935. The area averages one M>3 earthquake every second year. There is an indication of a NW-SE elongation (parallel to the major faults of the Ottawa valley) and focal mechanisms consistently show a NE-dipping NW-trending plane, which would be consistent with a fault outcropping under the Ottawa River and Lake Timiskaming. Seismotectonic analysis is continuing.
Bibliography of Canadian Geomorphology