About Earthquake

earthquake damagesAbout 100,000 to 500,000 earthquakes occur each year but only few are major and causes damage to lives and buildings. It was difficult to predict well before the quake occurs until now. An earthquake is the result of a sudden release of energy in the Earth’s crust that creates seismic waves. When the epicenter of a large earthquake is located offshore it causes tsunami. Earthquake is measured in Richter scale. The magnitude of 5 to 9 is risk and causes serious damages to lives and buildings. Earthquakes can also trigger landslides, and occasionally volcanic activity.

The Earth is formed of several layers. When there is relative motion of the layers or when slip or thrust occurs it causes tremor. Earthquakes create various types of waves with different velocities. Seismic wave fields are recorded by a seismometer. There are different types of seismometers like pendulum, electronic sensors and teleseismometers.

Earthquakes in 2013

Region No. of times Scale
Afghanistan 1 5.6
Alaska 4 6.1 to 7.5
Amsterdam Island 1 6.4
Argentina 1 6.1
Balleny Islands 1 6
Canada 1 6
Chile 5 6.2 to 6.8
China 3 5.8 to 6.6
Christmas Island 1 6.7
Colombia 2 6.6 to 6.9
Falkland Islands 1 7
Fiji 2 6.1 to 6.5
Georgia 4 6.1 to 7.3
Greece 2 6.2 to 6.4
Guatemala 2 6.2 to 6.6
India 3 4.7 to 5.8
Indonesia 7 5.3 to 6.5
Iran 3 5.6 to 7.7
Japan 7 5.8 to 7.1
Kegen, Almaty 1 6
Kermadec Islands 5 6.0 to 6.5
Kuril Islands 3 6.1 to 7.2
Maluku 1 6
Mariana Islands 4 6.0 to 6.8
Mexico 4 6.0 to 6.5
Mid-Atlantic Ridge 1 6.6
New Zealand 3 6.1 to 6.6
Nicaragua 1 6.5
Pakistan 2 6.8 to 7.7
Papua New Guinea 9 6.0 to 7.3
Peru 3 6.0 to 7.1
Philippines 2 6.2 to 7.1
Prince Edward Islands 1 6.1
Russia 4 6.0 to 6.6
Santa Cruz Islands 9 6.0 to 8.0
Sea of Okhotsk 2 6.7 to 8.3
Solomon Islands 1 6.1
Sumatra 1 6.1
Taiwan 3 6.0 to 6.3
Tonga 3 6.2 to 7.4
Vanuatu 2 6.0 to 6.1
Venezuela 1 6.1