Aaron

__**Earthquakes!**__
 * Earthquakes affect millions of people every year. **
 * Read on to find out more about earthquakes. **


 * How earthquakes are causedmedia type="custom" key="10059261" **
 * Earthquakes are caused by tow tectonic plates on the earth’s crust that are rubbing pushing or puling together to create movement. The movement in the earth releases the presser in rocks. **


 * How earthquakes are measured **
 * Earthquakes can be measured by inSAR or a seismograph. A Interferometric Synthetic Aperture Radar also known as inSAR, uses imagers to generate maps of the surface of the earth. Differences in the phases of the waves returning to the satellite or aircraft are used to generate these maps. A seismograph is also a way of telling if an earthquake occurs. A seismograph has a wire attached to a weight with a pen on the weight. The pen scribes on a scroll of paper when an earthquake occurs. **


 * Preparing for earthquakes **
 * A few steps you would think about when building a house should include **
 * ** A low centre of gravity **
 * ** Long and strong foundations **
 * ** Strong but flexible steel frames **
 * ** The building moves with the tremor **

**by Aaron Church **