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 ﻿S am, Fish and Josh on Earthquakes

= =  Earthquakes  media type="custom" key="9879717" Sam McCabe L4C Lloyd street primary school Earthquakes are one of the most devastating and destructive things known to man today. They kill, destroy, damage peoples family, animals and crops. They cannot only do these monsters ruin lives but can cut out communication in the area or even the city! Why do earthquakes happen? Earthquakes are caused by the earth’s tectonic plates moving and rubbing against each other. Where these plates meet are called fault lines. There are three different types of earthquakes. The first earthquake is the primary waves or (p) waves for short. These are the fast by far of the three waves moving at an astonishing of 8 killermeters per second! As fast as this must sound, this primary wave causes the least damage of the three earthquakes. All earthquakes are horrible but this one is the best one to come across. If you didn’t have the technology to measure earthquakes, you would recognise this earthquake because of the load ripping sound it makes before the shaking starts. This second wave is called a secondary wave or (s) wave. These don’t move as fast as the primary wave moving at the speed of 4.5 killermeters per second. But slower is better according to the secondary wave resulting in a lot more damage. It has a worse effect on the surface above because this earthquake moves in a ripple like motion. (Moving up and down and side to side.) The final wave is the surface wave, as you most likely guessed from the name, this earthquake travels on the surface of the ground. This wave moves really slow compeered to the other two waves moving as slow as 1.5 killermeters per second. These do about as much damage as the secondary wave but what’s funny about this wave is that it causes more damage father away from the **epicentre**. The **epicentre** is the middle of the earthquake Where the earth buckles and heaves under pressure. =What’s so bad about earthquakes?= Everything about them, they cause nothing good. They cause lose of: crops, communication, houses and property, money supplies. Water, gas, and plumbing pipes destroyed. Luckily engineers have invented pipes that can bend and stretch under pressure when an earthquakes hit. When earthquakes hit some building fall and crumble sometimes with people in it, people die and get trapped under fallen building such as in new Zealand and in Japan which i will talk about later =What is an aftershock?= Aftershocks follow after the main shocks, this could be any of the waves I talked about earlier (this could be a (p) wave or a (s) wave) These can be strong on weak there is no way you can know. Aftershocks can go on for days, weeks, months and years after the main shock. =What happened to Japan then?= Japan has had a lot of earthquakes in its past history but lately there has been a lot of horrible earthquakes in the past months having a tsunami and a massive 9.0 earthquake and over **300** aftershocks over 5.0. in Japan there are broken cars and houses and homeless people.

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