Addison's Blog Issue #3: Local Earthquakes
Geological Findings of Earthquakes
September 6, 2022
For this week of Addison's Blog, we will be discussing the shocking discoveries as well as the history of earthquakes. Earthquakes are geological signs of ground shifting which are caused by other natural disasters, such as erupting volcanos from offshore islands, tsunamis, or from within the earth's crusts. There are four types of earthquakes which are volcanic, tectonic, explosion, and collapse.
Each of these earthquakes is different because of the impact they make on the earth's surface above ground and its inhabitants. For volcanic, these come from any volcanos that erupt which in turn causes tectonic movements. Tectonics is about the physical and chemical changes of the earth's edges when they break away from the mainland and form new forms after a series of decades. An example can be found in the previous issue of this blog. The third set of earthquakes is an explosion which is a major earthquake because it is caused by a sudden explosive field of energy like a nuclear bomb from the top of the earth's surface. As for the collapsing kind, these are the least effective types that can be found in underground mines or caverns which are made from small explosions of dynamite.
As we last spoke, we will be talking about the earthquakes in this country to discover the impact on the environment. One of the earthquakes in Canada began in the 1960s within the St. Lawrence river. One of these earthquakes happened in 1963 on January 5. The intensity was said to be extreme, and it was rumbling for about 750,000 square miles across the eastern part of the country. The results of this were some of the chimneys and shelves from some of the houses in the Massachusette Bay were cracked. No one was hurt during that incident.
Another earthquake that had quite an impact on Canada was a lot further back in the year 1933, in Baffin Bay, Nunavut Canada which is near the Arctic Circle. What's so special about this earthquake was that it was the largest earthquake to have ever been felt in North America. Although despite its depth of being 10 km long, there was no harm or hazard that affected any town due to its offshore location.
There have been numerous earthquakes in the western part of Canada which can be found offshore. An important vocabulary word to look at is "magnitude" which means the size of an event. Canada's largest earthquake on August 22, 1949, made history by beating the record of the 1906 San Francisco earthquake with a magnitude of 8.1. However, not all regions in Canada have earthquakes such as Manitoba, and Saskatchewan since they aren't quite near any offshore locations.
Links: https://www.earthquakescanada.nrcan.gc.ca/historic-historique/events/16630205-en.php
https://www.worlddata.info/america/canada/earthquakes.php
https://www.earthquakescanada.nrcan.gc.ca/historic-historique/events/19331120-en.php?wbdisable=true
https://earthquakescanada.nrcan.gc.ca/historic-historique/caneqmap-en.php
https://earthquakescanada.nrcan.gc.ca/zones/westcan-en.php
Very good seismic reflection on what the hazard is! Could you also add their mitigation efforts?
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