Sunday, January 19, 2014

 Hurricane is one of the hazards that is accommodated by wind and sometimes rain. It is mostly destructive due to the strong winds and strong rains. It is also called typhoons in the western Pacific or cyclones in Australia and Indian Ocean. It forms over tropical oceans. It also has a low pressure. It moves counter-clockwise in northern hemisphere. 
Volcanoes are mountains or hills, that have a crater or vent through which lava, rock fragments, hot vapor, and gas are being or have been erupted from the earth`s crust. The eruption might take through a day or it may last up to years. It is also one of the most disastrous natural calamities on earth. Mount Pinatubo was one of the most destructive calamity in the 20th century. It affected the great amount of area in the Southeast Asia.
There are differences between the two natural disasters. Here are the differences:

Volcanic Eruption
Typhoons and Hurrican
Magnitude
No single feature to measure how big the volcano is.
There is the intensity to measure hyrricane on the saffir-simpson scale. This is to measure the wind speed and air pressure in the scale of 1-5.
Duration
It can last from less than a day to years.
It can last till days and up to years.
Spatial Distribution
Volcanoes can be found in continental settings or oceanic settings. This means that volcanoes can be found in either land or underwater.  

Severe Cyclonic Storm: North Indian Ocean 

Tropical Cyclone: South and Southwest Indian Ocean 

Severe Tropical Cyclone: Southwest Pacific Ocean and Southeast Indian Ocean 

The more familiar term, "hurricane", is used in the Atlantic Ocean and the eastern Pacific Ocean


Predictability
Volcanic eruptions are very difficult to predict, however, it is said that the beginning of a volcanic eruption is easier to predict than to predict the end of a volcanic eruption.

Hurricanes are very erratic; prediction is difficult

Regularity and Frequency
Shown in the Volcanic Explosivity Index table, non-explosive to gentle explosions occur frequently, and daily, compared to very big volcanic eruptions with a plume height of >25 km, which happen about once every 10,000 years. 

See the table below

Storm Frequency
Tropical storms and Typhoons by month,
for the period 1959–2011 (Northwest Pacific)
Month
Count
Average
Jan
25
0.5
Feb
12
0.2
Mar
23
0.4
Apr
34
0.6
May
63
1.2
Jun
90
1.7
Jul
205
3.9
Aug
296
5.6
Sep
262
4.9
Oct
210
4.0
Nov
133
2.5
Dec
66
1.2
Annual
1419
26.8

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