Earthquakes

What happens for each of these types of earthquakes? Well done this is a great definition of each or the different types! || || The Richter magnitudes are based on a logarithmic scale (base 10). What this means is that for each whole number you go up on the Richter scale, the amplitude of the ground motion recorded by a seismograph goes up ten times. Using this scale, a magnitude 5 earthquake would result in ten times the level of ground shaking as a magnitude 4 earthquake. Really, what about the Micalli Scale? Can you find some information about this? Are there other scales that measure earthquakes also? || || What kind of earthquake was it. What was the impact on the city, how did they rebuild? What size was it. Are there any pictures that you can add in? Great information gathering guys. We were very lucky in Christchurch really. || || By Cassidy & Gabriel. Why should you cover your head, not neck? Beacause your head is more valuabler then your neck. Is an aftershock always going to be a less magnitude than the first earthquake? No, beacause we had a 4.4 then a 5.1 earthquake. So really the answer is no.
 * [[image:russleyreadersroom6/Picture_11.png]] || [[image:russleyreadersroom6/jpan.jpg width="258" height="193" caption="Earthquakes!!"]] ||
 * What are the common causes of earthquakes? ||  ||
 * An earthquake is what happens when to blocks suddenly slip past one another. The surface is named fault or fault plane. ||   ||
 * Are they all the same? ||  ||
 * No earthquakes are not all the same.Some are called Tectonic,Volcanic,Collapse and Explosion. The tectonic plates are manily caused by a 2 plates moving up and down. The volcanic earthquake is caused by an underground eruptions. The collapse earthquake are caused by humans belive it or not. Explosion earthquakes occur due to chemical or nuclear explosions.
 * How do they measure earthquakes? ||  ||
 * Earthquakes are measured with a seismograph on the Richter Scale and a Mercalli scale. The [|Mercalli scale]isn't considered as scientific as the Richter scale, though. Some witnesses of the earthquake might exaggerate just how bad things were during the earthquake and you may not find two witnesses who agree on what happened; everybody will say something different. The amount of damage caused by the earthquake may not accurately record how strong it was.
 * Where do earthquakes happen most? ||  ||
 * Most earthquakes happen underneath the ground surface. There is a pattern of earthquakes around the outside of the tectonic plates. Why is there a pattern on the world map below? ||  ||
 * Is there anywhere that doesn’t have earthquakes? ||  ||
 * There are some places on earth that can yhave earthquakes beacuse the countrys that have earthquakes are in the zone of the Pacfic Ring of Fire. On this map is shows the last earthquakes and aftershocks with in 5 days 23rd-28th June. Are you sure? || [[image:russleyreadersroom6/topMap_eveday.gif width="295" height="172" caption="Earthquakes that have happend around the world"]] ||
 * Describe an historic earthquake ||  ||
 * The San Francisco earthquake happend on Wednesday 18th of April 1906. The earthquake measured 7.9. From this earthquake over 3000 people died. The damage to the city and homes left 225,000 people homeless. To rebuild this city it cost them over $400 million dollars.
 * List 3 of the most recent earthquakes. ||  ||
 * The February 22nd Christchurch earthquake measured 6.3 on the Richter scale, March 11th Japan earthquake measured 9.0,May 12th Spain earthquake measured 5.1. How big were they? || [[image:russleyreadersroom6/imagesCA1678Z4.jpg width="233" height="174"]] ||
 * What is the difference between an earthquake and an aftershock? ||  ||
 * Earthquakes are bigger and stronger then aftershocks. ||  ||
 * What should you do in an earthquake? ||  ||
 * Get down, Cover your head with your hands and find some stable shelter. ||  ||

Wasn't our 2010 september 4th earthquake bigger than our feb 22nd? The September earthquake was bigger then the Febuary earthquake but the Febuary earthquake killed people and did more damage then the September earthquake. Also the Febuary earthquake was shollower then the September one﻿.

Can an earthquake happen when two plates pull apart? Yes it is called a Divergant Earthquake.