Natural hazards
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Natural Hazards. What are the greatest risks? Are these risks increasing? What are the costs associated with environmental hazards? Are the relative costs the same around the world? What controls these costs? How do we define risk?. So… What are common hazards.

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Natural Hazards

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Natural hazards

Natural Hazards

  • What are the greatest risks?

    • Are these risks increasing?

  • What are the costs associated with environmental hazards?

    • Are the relative costs the same around the world?

    • What controls these costs?

  • How do we define risk?


So what are common hazards

So… What are common hazards

  • Let’s list the hazards people think of when of when they think of natural hazards

  • Which of these are the most dangerous in the U.S.?

  • Which are the most expensive (in the U.S.)?


Data for u s

Data for U.S. ???

Data is a 150 year average from 19th and 20th centuries (Keller, 1999).


Number of hazard events world wide type of hazard no of events

Number of Hazard Events World WideType of Hazard No of Events

9476

2389

1337

986

899

793

782

448

269

259

240

168

84

77

18

Tornadoes (U.S. only)

Flood

Tropical Cyclone

Tsunami

Earthquake

Wind (other than tornado)

Drought

Landslide

Wild fire

Extreme temperature

Temperate winter storm

Volcano

Tornadoes (non-US)

Famine

Storm surge

For 20th century data from WHO (2002), U.S. tornado data are only for 1950-1995 for only F2-F5 size events


Numbers of deaths associated with natural disasters worldwide

Numbers of Deaths Associated with Natural Disasters Worldwide

Data for 20th century, based on WHO (2002) data.


Worldwide hazard ranking by cost type cost

Worldwide Hazard Ranking by CostType Cost

Earthquake

Flood

Tropical storm

Wind Storm

Wild Fire

Drought

Cold wave

Heat wave

Total

$248,624,900,000

$206,639,800,000

$80,077,700,000

$43,890,000,000

$20,212,800,000

$16,800,000,000

$9,555,000,000

$5,450,000,000

$631,250,200,000

Cost of natural hazards, summarized by type for top 100 most costly events of 20th century (WHO, 2002).


Natural hazards

F5 Tornado that hit Greensburg

Kansas, May 4, 2007

-Doppler radar gave a 20-minute warning

-Tornado was 1.5 miles across at its base

-95% of the town was leveled


Natural hazards

http://www.chaseday.com/tornadoes.htm


Natural hazards

Lightening strikes 100 times/second worldwide, with the greatest number of hits in central Africa. In the U.S. the greatest number of lightening strikes occur in Florida.

The Empire State building is hit on average 100 times/year.


Natural hazards

Sean & Michael McQuilken, 1975


Define some terms

Define some terms

  • What are precursor events?

  • What is forecasting?

  • How do warnings work?

  • What is risk?

    • What is acceptable risk?

  • What is the purpose of insurance?


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