Final Canada Blog

Canada is a country that experiences virtually every type of natural hazard we know of.  From Hurricanes to Tornadoes, Volcanoes to Earthquakes, forest fires to landslides, Canada experiences all that Mother Nature has to offer.  However, not all regions of Canada experience each of these disasters.  Many of these hazards only occur in small regions of Canada.  Others occur very infrequently or in such remote areas that they do not impact the general population of Canada.  However there are two hazards that are widespread throughout Canada and these hazards are also directly related to one another.  Each year, the hazards that cause the most destruction and expense are Landslides and Severe Weather.

Canada experiences precipitation in all forms, rain, sleet, hail, snow, and ice.  Due to the warmth of the Pacific Ocean, the western coast of Canada receives very little snow, but can receive over 100 inches of rain per year.  Other regions on the Atlantic coast receive rain mixed with severe incoming wind in hurricane or cyclone from.  Snowfall generally increases when traveling west from the Atlantic, with the Rocky Mountains receiving an annual 240 inches of snow.  This combination of heavy wind, rain, and snow in such a cold climate can cause damage to power lines, roads, trains, and buildings.  After the initial impact of the rain and snow and as the ice and snow begins to melt, our second natural hazard begins to occur.

Landslides are very frequent in Canada, due to several geographical factors.  The terrain of Canada is very mountainous and unstable.  This can cause debris and loose rock to fall, even without the outside influence of rain or water.  The heavy rain and snow Canada gets each year also leads to additional landslides.  During or following heavy rainstorms, landslides often form due to the force at which the rain hits or washes down a mountainside.  This flowing water can pick up rocks, mud, and other debris, gaining speed as it descends down a slope.     

Snow and freezing conditions only amplify the impact of landslides.  The snow itself can often add to the weight on loose soil, thus causing the initial slide.  Other times, the snow can be piled so high, a small amount of melt to the bottom layer of snow can lead to an Avalanche.  These landslides of snow can reach up to 280/mph and weigh up to 100,000 tons.  Sometimes these are triggered skiers, and each year there are stories about adventurers who do not survive their fall. 

Where we truly see how the severe weather can lead to landslides is the impact of ice.  Rainwater can become trapped in the small cracks between rocks on the large mountainsides of the Canadian wilderness.  Due to cold temperatures, this water will then freeze inside the rocks, expanding and increasing the size of the cracks.  When the ice melts, the water is released, and the structure of the rocks has been weakened.  Over time, this can lead to massive landslides containing tons of rock. 

The most advanced technology is being employed in order to monitor the movement of entire mountains by taking frequent satiate images to check for any differences.  In addition to increasing the range of this photo monitoring program, I would also monitor seismic activity for any warning signs of strong activity that could trigger a slide.  While there is little that can be done about weather, implementing stronger infrastructure for at risk areas would help reduce the impact of severe weather.  Identifying at risk locations and taking necessary precautions to reinforce structures and roads would also decrease damage caused by weather.  Both events need to be announced to the public as soon as possible, and evacuation of high risk areas would also reduce loss of life. 

There are many regions of Canada that could be identified as high risk.  Personally, I see the most at risk areas of Canada also to be the most remote.  Areas with low population often are less prepared to endure loss of power, roads, or water.  The Northeast, specifically Newfoundland, is sparsely populated, and experiences some of the most severe weather in Canada.  Other places such as Yukon and Northwest Territory would be at risk for landslides due to their rocky terrain.

If I was to build a house in Canada, I would choose to build it in Vancouver, British Columbia.  Just over 30 miles north of Washington, Vancouver is a city with virtually the same hazard risks as here in California, with a lot more rain.  This is a city that has plenty of resources, and less risk of landslides and forest fires than a more mountainous, remote region of Canada.  There is always the chance of a major earthquake, volcano, or tsunami, caused by the three tectonic plates along the Pacific coast.  However the risks of tornadoes, hurricanes, and landslides decreases greatly due to the climate of the Pacific as opposed to the east coast.  Personally, I am more comfortable with rare chance of an earthquake here on the Pacific coast, than the annual hurricane or blizzard experienced by the Atlantic coast.    

http://www.britannica.com/EBchecked/topic/91513/Canada/43271/Climate

http://www.statcan.gc.ca/tables-tableaux/sum-som/l01/cst01/phys08a-eng.htm

http://www.currentresults.com/Weather/Canada/Cities/precipitation-annual-average.php

http://enr.construction.com/news/environment/archives/050614.asp

http://www.redcross.ca/what-we-do/emergencies-and-disasters-in-canada/for-home-and-family/make-a-plan/planning-for-landslides

https://www.nrcan.gc.ca/hazards/landslides

Coastal Hazards in Canada

Canada has the longest ocean coastline in the world, and experiences a great amount of erosion.  While most of this coastline erodes at a moderate rate of less than 3 feet per year, parts of the Atlantic coastline experience up to 30 feet per year.  Some islands off the coast of Nova Scotia have incurred so much erosion, that the islands have now disappeared into the ocean.  Our textbook estimates that approx. 1 billion dollars are spent each year to control the erosion on the coast line. 

The eastern Atlantic coast of Canada’s shorelines is on a relatively inactive section of coast, of its distance from the convergent plate boundaries.  This leads to barrier islands and sandy beaches.  The western coast however is located near several active plate boundaries, which creates a very rocky mountainous coastline.  This coastline is also influenced by thick layers of ice, and movement of glaciers. 

The coastal region of Canada has an extreme rise between low and high tides.  This will produce “flood tides” that can rush in very quickly.  With a tidal range of 50 feet, these tides can come in as quickly as 3 feet every 23 min.  This quick change in tide level can be very dangerous for those who are not prepared for it.  This can lead to rip currents, and can catch even the most experienced swimmers in a very strong current.  In the event of a rip current, remaining calm and swimming parallel to the shore is the best way to get out of the current.   Attempting to swim directly at the current is generally unsuccessful, so swimming laterally to find a break in the strong current to swim back to shore  is the best way to avoid being swept further.

Information taken from Chapter 11 of our textbook, as well as:

http://www.tourismpei.com/beach-safety

https://www.nrcan.gc.ca/earth-sciences/science/water/marine-coastal-processes/10896

Tornadoes in Canada

The pattern of tornadoes in Canada is very similar to here in the United States.  The central plains region in the US is nicknamed “Tornado Alley”, specifically from North Dakota to Kansas.  Manitoba and Saskatchewan lie directly above this region, and experience many tornadoes each year.  Saskatchewan can experience up to 18 tornadoes per year.  The most devastating tornado in the history of Canada occurred in 1912, in Regina, Saskatchewan.  It caused 28 deaths, hundreds of injuries, and over 400 buildings destroyed. 

Canada is vulnerable to many types of extreme weather.  Each year Canada is hit with blizzards, ice storms, hurricanes, heat waves and tropical storms.  Environment Canada is the agency responsible for issuing weather alerts.  Environment Canada is responsible for warning the public when conditions exist that may produce tornadoes or other extreme weather. Using radio, television, newspapers, its internet site, and weather phone lines, Environment Canada provides information regarding at risk area and evacuation locations.  There is also a program called “Weather Watchers,” a group of volunteer weather enthusiasts who monitor the skies for any extreme weather on the horizon.  Environment Canada employs 31 weather satellites, which cover areas prone to thunderstorms and severe weather conditions, as well as where 98% of the population is located.  Most regions of Canada advise to seek the shelter of a sturdy desk in the event of a tornado.  Half of the deaths from tornadoes occur from mobile homes being hit, due to the lack of foundation.  Exiting the mobile home and finding shelter in a ditch away from any possible debris.  

http://www.theweathernetwork.com/news/articles/tornadoes-in-canada-everything-you-need-to-know/25876/1/1

http://www.getprepared.gc.ca/cnt/hzd/trnds-en.aspx

http://www.ec.gc.ca/meteo-weather/default.asp?lang=En&n=F3FC6CAA-1

http://www.cbc.ca/news/canada/saskatchewan/top-10-deadliest-tornadoes-in-canadian-history-1.1267514

Sinkholes in Canada

Sinkholes in Canada are actually a very common occurrence.  Sinkholes are common where the rock below the land surface is limestone, carbonate rock, salt beds, or rocks that can naturally be dissolved by the ground water circulating through them.  While many sinkholes are caused naturally by erosion and landslides under the surface of the earth, the sinkholes in Canada are in many cases man made.  Most sinkholes in Canada form under roads, due to the rupture or cracking of water and sewage lines underneath the roads.  The harsh winter and constant freezing and defrosting of these water systems puts a great amount of stress on the pipes below the roads.  Even a small leak can cause water to gradually seep into the soil under the roads, which will compromise the ability of the soil to support the surface above.  Over time, this can cause serious damage to the pipes and roads.  In some cases, when the pipes burst, the volume of water released into the earth can create sudden sinkholes with little or no warning signs.  

Certain areas of Canada are more prone to sinkholes do to a surface or subsurface layer of soft silt, leftover from the latest ice age.  This soft soil can cause risks of subsidence, especially near train tracks in remote areas.  Due to the large amount of snow melt each year, the runoff can cause the silt to soften and erode.  If the wrong structure is built on top of this silt, the structure can be destroyed.  This issue has been addressed, and efforts are being made to use higher quality materials in the construction of roads and water lines.  Many of the older, existing roads were built with a softer clay like soil beneath them.  Officials have worked to identify current risks for sinkholes, and are attempting to reinforce these areas.  This can prove to be difficult, as it would cause road closures and is an expensive process.  

http://www.canadianunderwriter.ca/news/hole-picture/1002925051/?&er=NA

http://globalnews.ca/news/401401/a-list-of-the-worst-sinkholes-in-canada-and-around-the-world/

http://www.cbc.ca/news/canada/why-the-ground-suddenly-gives-way-1.907424

Canada Landslides

Each year, there are thousands of landslides throughout Canada. The combination of steep mountains and melting ice flows makes Canada particularly vulnerable to landslides.  Each winter, when the frozen ice covering the mountains melts, it can cause the rocks to release from the mountain.  There are several strategies that are used to prevent the damage.

One interesting strategy that is being used in Canada is the use of satellite photo monitoring in high risk areas.  For example at Turtle Mountain, the satellite compares the position of  rock movement over a period of time to ensure the risk of landslides has not increased.  The distance is tracked over a period of about 24 days, and can detect movement of as little as 5 millimeters.  This information can be vital for preparing for a flow.

Other tactics used involve government planning to alert citizens of pending disaster.  Promoting people in high risk areas to take extra precautions such as evacuation plans, staying away from power lines, and understating that the grounds may be unstable for several days following an event.    

 

http://enr.construction.com/news/environment/archives/050614.asp

http://www.redcross.ca/what-we-do/emergencies-and-disasters-in-canada/for-home-and-family/make-a-plan/planning-for-landslides

https://www.nrcan.gc.ca/hazards/landslides

Tsunamis In Canada

The British Columbia coast is the only part of Canada that is at serious risk of experiencing a Tsunami.  Located on the Pacific Coast, between Washington and Alaska, British Columbia does have measures in place in the event of a tsunami.  BC uses a system of Watch, Advisory, and Warning.

Tsunami watch would be triggered by seismic activity occurring.  In the evening of seismic activity, local communities are notified they may be in danger of a Tsunami.  This is the notification that communities should start preparing, and they should implement their emergency plans.  Evacuation is not necessary at this point, but people should start to prepare for that possibility.

Tsunami Advisory are issued when seismic activity has created currents and conditions that could impact coastal areas.  While this does not pose a significant threat to lives and structures, the conditions could become dangerous.  At this point, harbors, marinas, and beaches should be evacuated, and people should avoid the coast.

Tsunami Warnings are issues when there is impending danger to the coast, as well as communities nearby.  All public evacuation plans should be implemented, and all coastal areas must be evacuated.  Coastal roads will be closed, and beach access will be restricted to emergency vehicles.

The threat of tsunamis is always present on the western coast of Canada, due to the 3 intersecting faults.  Currently, the tsunami warning system in BC is managed by the United States Department of Commerce.  British Columbia is included in the National Oceanic and Atmospheric Administration which is detects tsunamis and provides notification to all countries along the Pacific Ocean.  The Emergency Management British Columbia is in charge of receiving these alerts, and informing those communities at risk.

http://www.embc.gov.bc.ca/em/hazard_preparedness/Tsunami_Brochure/Prepare_for_Tsunami.html

http://www.canadiangeographic.ca/tsunami/tsunamis_canada.asp

Volcanic Activity in Canada

There has only been one documented volcanic eruption in the late 1700's, however there are many dormant volcanoes along the western coast of Canada.  The Tseax Cone Volcano occurred about 1775, and was responsible for approximately 2,000 deaths.  The lava destroyed several villages and created toxic gas around the area.  Lava flows engulfed the Nass river, forever changing the landscape.  

Currently, there are six volcanoes along the convergent plate boundary that separates the Juan de Fuca and North American plates.  While this area is considered to be in the “Ring of Fire” that is notorious for volcanic activity, these major events have occurred in Washington and Alaska.  The 1980 Mt. St. Hellens eruption occurred just 400 km from the US Canada border.  Mt. Baker, which is just 40 km from the US/Canada border, would be the biggest volcanic risk to the Canadian people in the province of British Columbia. 

Mt. Baker experienced a minor eruption in 1870, and steam can be seen coming from the top peak on a cold day.  Although this does not indicate a pending eruption, this does illustrate that Mt. Baker could erupt someday.  While an eruption of Mt. Baker would likely not cause significant destruction in British Columbia, there would be secondary effects.  A thick layer of ash would impair the air quality of British Columbia, as well as stress many of their emergency resources.  The risk of volcanic activity is very low, however dramatic seismic activity could change all of that.  

http://www.embc.gov.bc.ca/em/hazard_preparedness/volcano/volcano-hazards-in-bc.pdf

https://www.publicsafety.gc.ca/cnt/mrgnc-mngmnt/ntrl-hzrds/vlcnc-rptn-eng.aspx

http://volcanoes.usgs.gov/volcanoes/baker/baker_geo_hist_115.html

http://www.canadiangeographic.ca/blog/posting.asp?ID=439