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Earthquakes

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mya mohabbati

on 16 September 2015

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Transcript of Earthquakes

What is an Earthquake?
An earthquake is a type of a natural disaster. They are caused when two tectonic plates push, rub or slide against each other. Earthquakes are measured by the Richter scale and the Modified Mercalli scale. Some earthquakes can not be felt, but others can cause road damage, destruction of buildings and can even leave many people in risk for their lives.
Where do earthquakes Occur?
The outer layer of the earth which is called the earth's crust, is made up of several pieces called plates. Earthquakes usually occur along the edge of the oceanic plates and continental plates.
The Richter Scale
The Modified Mercalli Scale
The Modified Mercalli Scale rates the intensity of an earthquake. It was developed in 1931 by two seismologists named Harry Wood and Frank Neumann.
Bibliography
earthquake.usgs.gov/learn/topics/mercalli.php
science.howstuffworks.com/nature/natural-disasters/earthquake6.htm
earthquake.usgs.gov/learn/glossary/?term=Richter%20scale
www.geo.mtu.edu/UPSeis/where.html
www.geo.mtu.edu/UPSeis/why.html

The Richter Scale measures the amount of energy an earthquake releases. The Richter Scale was developed by Charles F. Richter in 1935. He also was a geologist in that time. He thought of the Richter Scale as a mathematical device to measure earthquakes.
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