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| Canada–US Passive Seismic Network | |
|---|---|
| Name | Canada–US Passive Seismic Network |
| Country | Canada; United States |
| Established | 1990s |
| Type | Seismological network |
| Operators | Geological Survey of Canada; United States Geological Survey; academic institutions |
| Instruments | Broadband seismometers; nodal arrays; GPS timing |
| Purpose | Seismic monitoring; tomography; earthquake research |
Canada–US Passive Seismic Network
The Canada–US Passive Seismic Network is a cross-border array of seismic stations for recording natural and anthropogenic seismicity across Canada and the United States. It supports research by agencies and institutions such as the Geological Survey of Canada, the United States Geological Survey, University of British Columbia, Caltech, and Massachusetts Institute of Technology. The network has contributed to studies involving the San Andreas Fault, the Cascadia subduction zone, the New Madrid Seismic Zone, and the Queen Charlotte Fault.
The network integrates instruments deployed by organizations including the Geological Survey of Canada, the United States Geological Survey, the Pacific Northwest Seismic Network, the Berkeley Seismological Laboratory, the Seismological Society of America, and university groups from University of Washington, University of California, Berkeley, and University of Toronto. Stations span provinces and states from British Columbia and Yukon through Alaska to Washington (state), Oregon, California, Montana, North Dakota, Minnesota, Michigan, New York (state), and Maine (U.S. state). The array supports collaborations with international bodies such as the International Seismological Centre, the Incorporated Research Institutions for Seismology, and the North American Plate. Data products have been used alongside datasets from the Global Seismographic Network, the Canadian Hazard Information Service, and regional catalogs like the Comprehensive Nuclear-Test-Ban Treaty Organization monitoring.
Early passive seismic efforts trace to regional initiatives by the Geological Survey of Canada and the United States Geological Survey in the late 20th century. Key programs and campaigns included experiments run by research groups at Stanford University, Harvard University, Princeton University, University of Alaska Fairbanks, and McGill University. Influential projects involved tomographic and ambient-noise studies inspired by methods published by teams at Massachusetts Institute of Technology and California Institute of Technology. Funding and policy support arrived via agencies such as the Natural Sciences and Engineering Research Council of Canada, the National Science Foundation (United States), and provincial bodies like the British Columbia Ministry of Energy, Mines and Low Carbon Innovation. Collaborative field campaigns referenced operational models from the Alaska Earthquake Center, the Pacific Northwest Seismic Network, and the Southern California Seismic Network.
Station design followed standards by the Incorporated Research Institutions for Seismology and instrument specifications used by the Global Seismographic Network. Equipment vendors and laboratories linked to the network included manufacturers and research groups associated with Nanometrics, Güralp Systems, Streckeisen (Streckeisen Werke), and facilities at Lamont–Doherty Earth Observatory. Typical installations used broadband seismometers, short-period sensors, and nodal arrays deployed by teams from University of Calgary, University of Alaska Fairbanks, University of Oregon, and Oregon State University. Time synchronization employed Global Positioning System receivers and timing standards referenced to institutions like the National Institute of Standards and Technology and Natural Resources Canada. Stations were sited near infrastructure managed by entities such as Parks Canada, the Alaska Department of Transportation & Public Facilities, and municipal partners including City of Vancouver and City of Seattle.
Raw waveform data were archived in formats compatible with the IRIS Data Management Center and processed using software developed at institutions including Massachusetts Institute of Technology, Caltech, University of California, Los Angeles, and ETH Zurich. Analysis techniques drew on methodologies from publications by researchers at Scripps Institution of Oceanography, Woods Hole Oceanographic Institution, and NOAA. Processing pipelines incorporated ambient-noise correlation, receiver function analysis, and full-waveform inversion as practiced by groups at Columbia University, University of Arizona, and University of British Columbia. Seismic event catalogs were cross-referenced with entries from the ANSS Comprehensive Catalog, the Canadian National Seismograph Network, and the USGS National Earthquake Information Center. Data sharing policies were influenced by agreements modeled after the International Federation of Digital Seismograph Networks.
The network enabled advances in crust and mantle imaging, contributing to tomographic models of the Juan de Fuca Plate, the Gorda Plate, and the Farallon Plate remnants. Studies using the array informed hazard assessments for the Cascadia subduction zone megathrust, constrained rupture processes on the San Andreas Fault, and refined seismicity patterns within the New Madrid Seismic Zone. Research teams from University of California, Santa Barbara, University of Colorado Boulder, University of Illinois Urbana-Champaign, and University of Minnesota used the data to study induced seismicity near resource developments overseen by agencies such as the Department of Energy (United States). The network supported earthquake early warning research allied with projects at ShakeAlert partners including US Geological Survey and multiple state agencies. Cross-disciplinary applications involved glaciological studies collaborated with University of Alaska Fairbanks and geodesy integrations with Jet Propulsion Laboratory GPS analyses.
Governance and collaboration involved federal agencies such as the Geological Survey of Canada and the United States Geological Survey, provincial bodies like the Government of British Columbia, and academic consortia including Incorporated Research Institutions for Seismology and the Seismological Society of America. Multilateral agreements referenced models from the North American Free Trade Agreement era for data exchange, while funding and oversight connected to Natural Sciences and Engineering Research Council of Canada, the National Science Foundation (United States), and regional research networks such as the Pacific Northwest Seismic Network. Operational logistics required coordination with indigenous authorities including First Nations in British Columbia and territorial governments such as the Government of Yukon.
Challenges included station density gaps in northern regions like Nunavut and the Yukon, logistic constraints in remote terrain typified by the St. Elias Mountains, and environmental impacts in sensitive areas managed by Parks Canada. Technical limitations involved noise levels in urban corridors such as Los Angeles, Vancouver, and Seattle, and data latency issues for real-time applications requiring integration with systems managed by Northern California Earthquake Data Center and Pacific Northwest Seismic Network. Funding instability affected long-term maintenance, with programmatic support dependent on agencies like the National Science Foundation (United States), Natural Sciences and Engineering Research Council of Canada, and state or provincial budgets.
Category:Seismological networks