An earthquake (also known as quake or temblor) is the result of a sudden release of energy in the Earth's crust that creates seismic waves. The seismic waves are ones of energy that travel through the earth. The seismic activity of an area refers to the frequency, type and size of earthquakes experienced over a period of time. Earthquakes are measured using seismometers.


The seismic areas are located in zones of plates contact. Some of these plates have failures. In those failures, the energy is acumulated, and when there is a huge accumulation of it, this ejected it. That's why eartquakes are casued. Other reasons why eartquakes ocurre are because of volcanic eruptions or landslides.


The concequences of earthquakes could be as desavasteting as problematic. For example, if the estructure of the houses in the city is not safe, they probably fall down. Not just the fact of the damage in the buildings, but also the danger of being in coastal zones. Most of earthquakes damages are not caused by the earthquake itself, but are caused by the tsunamis that ocurre later.


One of the most recent examples of disastrous eartquakes is the Japan Earthquake. On 11th March, a 9.0 grade earthquake ocurred in front of the cost of Honshu, at 130km from Sendai. Luckly, Japan is a seismic zone that is always prepared to this kind of disaster. But unluckly, they weren't ready for a tsunami. The tusanmi got there just a few hours after the quake. It caused a lot of devastation, more than 14.000 deaths, 5.000 injured, and 10.000 people missing. All the disaster cost exceed $300 billion, making it the most expensive natural disaster on record.


Another memorable earthquake is the Chile Quake, the 27th of February in 2010. It reached a magnitude of 8.8 grades, and also was impacted by the tsunami that happend a few hours later. There were over 525 deaths including that more than 500.000 houses were distroyed.


What you have to do in case of eartquakes:

According to Department of Conservation scientists, is very important to know what to do if you are in a earthquake.

* First and most improtant: DO NOT PANIC. Try to relax so then you can start thinking.

* If you are indoors, stay there. Get under a desk or table, or stand against a wall. Stay away of exterior walls, glass, heavy furniture, fireplaces and appliances. The kitchen is a particularly dangerous place. If you are in an office building, stay away from windows and outside walls and do not use the elevator.

* If you are outside, get into the open. Stay clear of buildings, power lines or anything else that could fall on you.

* If you are driving, move the car out of traffic and stop. Avoid parking under or on bridges. Try to get clear of trees, light posts, signs and power lines.

* If you are in a mountainous area, be aware of landslides. Likewise, if you're near the ocean, be aware about tsunamis. Get to high ground.

There are also some tips about what to do AFTER an earthquake.

*Check for fire or fire hazards. If you smell gas, shut off the gas valve. If there's evidence of damage to electrical wiring, shut off the power at the control box.

*If the phone is working, only use it in case of emergency. Likewise, avoid driving if possible to keep the streets clear for emergency vehicles.

*Listen to the radio for important information and instructions. Remember that aftershocks, sometimes large enough to cause damage in their own right, generally follow large quakes.

*If you leave home, leave a message telling friends and family your location.

In conclusion, earthquakes are natural disasters that can't be predicted, so we always have to be prepared for them. We advise people to get information and remember the tips about what to do during a quake and after one. In this way we can avoid stresfull situations and bad moments which can change our life. BE PREPARED!