Seismic activity and structural features in the Charlevoix region, Quebec
Seismic activity and structural features in the Charlevoix region, Quebec
Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre (November 1987) 24 (11): 2118-2129
- body waves
- Canada
- Charlevoix
- craters
- cryptoexplosion features
- earthquakes
- Eastern Canada
- elastic waves
- en echelon faults
- engineering geology
- epicenters
- fault planes
- faults
- focus
- geologic hazards
- geomorphology
- impact craters
- impact features
- meteor craters
- microearthquakes
- monitoring
- neotectonics
- North America
- P-waves
- patterns
- Quebec
- rift zones
- Saint Lawrence Valley
- seismic risk
- seismic waves
- seismic zoning
- seismicity
- seismology
- seismotectonics
- tectonics
- velocity structure
The Charlevoix region is historically the most active earthquake zone in Eastern Canada. Understanding the links between its seismicity and the faults of the region is important for the assessment of earthquake risk along the St. Lawrence Valley. The region has been monitored by a microseismic array since 1977, yielding accurate locations of the hypocenters. Previous analyses of data from the array indicated a relationship between the earthquakes and the St. Lawrence Valley paleorift faults. As a sequel to previous studies, the relationships between the seismic activity and the faults of the region were reexamined through the use of the composite P-nodal solutions, in an effort to clarify the nature of faulting in the seismic zone. The main objectives of this paper are to delineate the details of faulting within the Charlevoix region and to determine the effect of the impact crater on the nature of faulting in this area.--Modified journal abstract.
