Inside Earth, Chapter 2, Section 2

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Presentation transcript:

Inside Earth, Chapter 2, Section 2 Earthquakes Inside Earth, Chapter 2, Section 2

Cause of Earthquakes Why do earthquakes occur? An earthquake occurs when rocks break along a fault. This sudden release of energy causes seismic waves. The spot underground where the rock breaks is called the focus, and is deep in Earth’s crust.

Seismograph What is a seismograph? How does it work? A device used to record the ground movements caused by seismic waves as they move through Earth. How does it work? http://www.wwnorton.com/college/geo/egeo/flas h/8_3.swf

Three Types of Scales There are three types of scales used to measure the magnitude/intensity of an earthquake: Mercalli scale – not a precise measurement, describes how earthquakes affect people, buildings, and the land http://www.abag.ca.gov/bayarea/eqmaps/doc/mmi.html Richter scale – was used when mechanical seismographs were used; measures earthquakes that are small and nearby

Scale Used Today Moment Magnitude Scale Geologists use this today because it is the most accurate. Estimates the total energy released by an earthquake. Rates earthquakes of all sizes, near and far http://www.usgs.gov/newsroom/article.asp?ID=2679 article on high magnitude earthquakes http://earthquake.usgs.gov/learn/topics/richter.php article about the Richter scale

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