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Lecture 3

ENSC 2001 Lecture Notes - Lecture 3: Natural Hazard, Northern Ontario, Land Degradation

3 pages28 viewsFall 2016

Department
Environmental Science
Course Code
ENSC 2001
Professor
Quentin Gall
Lecture
3

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ENSC 2001 A
Lecture 3
September 28, 2015
Natural Hazards and Earthquakes
Natural Hazards
1. A natural hazard is any geologic/geomorphologic process/ event, which has an adverse socio-
economic or life-threatening impact on humans
2. One of the natural hazards are hurricanes (Ex. Hurricane Katrina)
3. Tornados
4. Volcanism deposits nutrients in the land
Canadian Natural Disasters (1900-2005)
1. The number of natural disasters per year has been increasing from 1900 up to 2005
2. The number of geological disasters remain stable
3. The weather related disasters has also increased (1998 St. Lawrence Valley ice storm)
Deaths Due to Natural Disaster in Canada (1990-2005)
1. Number of fertilities decreasing because of the rapid intervention over the same period of time
2. The largest peak was in 1936 corresponds to the pan-Canadian heat wave (1,180 deaths)
3. 1916 peak was due to forest fires in Northern Ontario (250 deaths)
4. Other peaks are due to storms
5. 2010 active year for natural disasters
The frequency of Natural Hazards appears to have Increased Since 1960. Why?
1. Global reporting has increased, especially from places historically not heard from (television
increased communication increased)
2. Global population has doubled since 1960, therefore, natural hazards had greater impact on
humans (more humans to be impacted by the natural hazards)
3. Population density increases
4. Increased land degradation, example deforestation because of increased population using forests
in certain area (increased deforestation, increasing surface flooding, taking away vegetation =
more land slides)
5. Climate change (anthropogenic) increased weather related disasters
Natural Hazard Categories
1. 1) Exogenic Earth’s surface processes, example like flooding, mass movement of land, soil
erosion, fire (Inc. atmosphere; gravitational)
2. 2) Endogenic Earth’s internal processes Example: volcanism, earthquakes they are on the
earth’s surface but they started from internal processes
Assessing Natural Hazards
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