natural disaster is an event of nature that takes human lives or
Types of natural disaster:
conditions: Blizzard, Cyclone, Hurricane, Tornado.
Floods and their
Fires and fire
disease: Plague, Epidemiology.
earthquake is the shaking of the earth’s surface caused by rapid
the earth’s rocky outer layer. Earthquakes occur when energy stored
earth, usually in the form of strain in rocks, suddenly releases. This
is transmitted to the surface of the earth by earthquake waves.
destruction an earthquake causes depends on its magnitude and duration,
amount of shaking that occurs. The size varies from small,
shaking to large shocks felt over thousands of kilometres. Earthquakes
deform the ground, make buildings and other structures collapse, and
tsunamis (large sea waves). Lives may be lost in the resulting
or seismic tremors, occur at a rate of several hundred per day around
world. A worldwide network of seismographs (machines that record
the earth) detects about one million small earthquakes per year. Very
earthquakes, such as the 1964 Alaskan earthquake, which measured 9.2 on
Richter scale and caused millions of dollars in damage, occur worldwide
every few years. Moderate earthquakes, such as the 1989 tremor in Loma
California (magnitude 7.0 on the Richter scale), and the 1995 tremor in
Japan (magnitude 6.8), occur about 20 times a year.
the last 500 years, earthquakes around the world have killed several
people including over 240,000 in the 1976 T’ang-Shan, China,
Worldwide, earthquakes have also caused severe property and structural
Adequate precautions, such as education, emergency planning, and
stronger, more flexible, safely designed structures, can limit the loss
and decrease the damage caused by earthquakes.