Many small earthquakes occur annually in Eastern Canada, but moderate to strong earthquakes are infrequent. The 25 November 1988 MW 5.9 Saguenay mainshock remains the largest earthquake in the last 80 years in eastern North America. In this article, some aspects of that earthquake sequence were re-analyzed using several modern methods. The regional depth-phase modeling procedure was used to refine the focal depths for the foreshock, the aftershocks, and other MN ≥ 2.5 regional earthquakes. The hypocenters of 10 earthquakes were relocated using hypoDD. The spatial distribution of eight relocated hypocenters defines the rupture plane of the mainshock. The moment tensor for the mainshock was retrieved using three-component long-period surface wave records at station HRV (Harvard seismograph station) with additional constraints from P-wave polarities. One nodal plane is conclusively identified to be close to the rupture plane, and its strike is similar to the trend of the south wall of the Saguenay Graben. Based on the consistency between the strike of the nodal plane and the trend of the Graben, as well as the deep focal depth distribution, we suggest that the Saguenay earthquake sequence is related to the reactivation of one of the faults of the Saguenay Graben.
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Research Article|
May 07, 2018
Further studies on the 1988 MW 5.9 Saguenay, Quebec, earthquake sequence
Shutian Ma;
a
Department of Earth Sciences, Carleton University, 1125 Colonel By Drive, Ottawa, ON K1S 5B6, Canada.Corresponding author: Shutian Ma (email: shutian33@yahoo.ca).
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Dariush Motazedian;
Dariush Motazedian
a
Department of Earth Sciences, Carleton University, 1125 Colonel By Drive, Ottawa, ON K1S 5B6, Canada.
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Maurice Lamontagne
Maurice Lamontagne
b
Geological Survey of Canada, Natural Resources Canada, 601 Booth St, Ottawa, ON K1A 0E8, Canada.
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Canadian Journal of Earth Sciences (2018) 55 (10): 1115–1128.
Article history
received:
08 Nov 2017
accepted:
02 May 2018
first online:
17 Oct 2018
Citation
Shutian Ma, Dariush Motazedian, Maurice Lamontagne; Further studies on the 1988 MW 5.9 Saguenay, Quebec, earthquake sequence. Canadian Journal of Earth Sciences ; 55 (10): 1115–1128. doi: https://doi.org/10.1139/cjes-2017-0231
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