to a number of changes in the way Canadians are dealing with volcanic hazards. For example, The Barrier, an unstable lava dam retaining the Garibaldi Lake system of southwestern British Columbia, has in the past unleashed several debris flows, most recently in 1855–1856. This led to the evacuation of the small resort village of Garibaldi nearby and the relocation of residents to new recreational subdivisions away from the hazard zone. Should The Barrier completely collapse, Garibaldi Lake would be entirely released and downstream damage in the Cheakamus and Squamish rivers would be considerable, including major damage to the town of Squamish and possibly an impact-wave on the waters of Howe Sound that would reach Vancouver Island. The Interagency Volcanic Event Notification Plan, Canada's volcanic emergency notification program, was established to outline the notification procedure of some of the main agencies that would be involved in response to a volcanic eruption in Canada, an eruption close to Canada's borders, or an eruption significant enough to have an effect on Canada and its people. It focuses primarily on aviation safety because jet aircraft can quickly enter areas of volcanic ash. The program notifies all impacted agencies that have to deal with volcanic events. Aircraft are rerouted away from hazardous ash and people on the ground are notified of potential ash fall. Monitoring Currently no volcanoes in Canada are monitored closely enough by the Geological Survey of Canada to ascertain how active their magma chambers are. An existing network of seismographs has been established to monitor tectonic earthquakes and is too far away to provide a good indication of what is happening beneath them. It may sense an increase in activity if a volcano becomes very restless, but this may only provide a warning for a large eruption. It might detect activity only once a volcano has started erupting. See also List of volcanoes in Canada Geography of Canada References External links Catalogue of Canadian volcanoes CVO Menu - Canada Volcanoes and Volcanics Overview of Canadian volcanoes/Canada volcanoes Global Volcanism Program: Volcanoes of Canada and the western USA GVP: Volcanoes of Canada Erica A. Massey: A Comparative Study of Glaciovolcanic Palagonitization of Tholeitic and Alkaline Sideromelane in Helgafell, Icland, and Wells Gray-Clearwater Volcanic Filed, BC, Canada. B.Sc., The University of British Columbia, 2014 Geographic areas of seismological interest Natural history of Canada Natural hazards in Canada