Earthquake in Gujarat, Mumbai

October 21, 2011 00:15
Earthquake in Gujarat, Mumbai

 

Eartquake in Gujarat

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AHMEDABAD: An earthquake measuring 5.3 on the Richter scale jolted Gujarat tonight
but there was no immediate report of any casualty or damage.  The epicentre of the quake

of moderate intensity, which shook the state at around 2248 hours, was 20km south
east of Sasangir near Vansthli town in Junagadh district, said Indian Met Department.

Officials said the quake was felt for 25 seconds in Junagadh and people rushed out of
their homes in panic.

The tremor was felt in several other parts of the state including Ahmedabad.

The state was rocked by a 7.6 magnitude earthquake on January 26, 2001 leaving 20,000
people dead and causing widespread destruction with the worst-affected being the Kutch region.

Earthquakes are caused by a sudden shift / movement deep under ground in the
Earth's tectonic plates.  On the surface, we see this as the shaking of the ground, causing
damage to poorly built structures.

The most powerful earthquakes can destroy even the best built structures. Earthquakes can
also cause other disasters including tsunamis and volcanic eruptions.

Earthquakes occur unpredictably along fault lines, capable of killing thousands of people.
Seismometers can detect the strength of an earthquake.  It gives a number on the Richter
scale devised by Charles Richter:
 

Descriptor

Richter
magnitudes

Earthquake Effects

Frequency of
occurrence

Micro

Less than 2.0

Microearthquakes, not felt.

About 8,000
per day

Very minor

2.0-2.9

Generally not felt, but
recorded.

About 1,000
per day

Minor

3.0-3.9

Often felt, but rarely causes
damage.

49,000
per year (est.)

Light

4.0-4.9

Noticeable shaking of indoor |
items, rattling noises.
Significant damage unlikely.

6,200
per year (est.)

Moderate

5.0-5.9

Can cause major damage to
poorly constructed buildings
over small regions.
At most slight damage to well
designed buildings.

800
per year

Strong

6.0-6.9

Can be destructive in areas up to
about 100 miles across in
populated areas.

120
per year

Major

7.0-7.9

Can cause serious damage over
larger areas.

18
per year

Great

8.0-8.9

Can cause serious damage in areas
several hundred miles across.

1
per year

Rare great

9.0 or greater

Devastating in areas several
thousand miles across.

1
per 20 years



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