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Earthquakes

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by

Joshua Smith

on 4 February 2014

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Transcript of Earthquakes

Earthquakes

Sudden release of built up energy inside the Earth.
due to movement along faults.
http://www.livescience.com/37052-types-of-faults.html
http://www.classzone.com/books/earth_science/terc/content/visualizations/es1002/es1002page01.cfm?chapter_no=visualization
http://earthquake.usgs.gov/learn/animations/animation.php?flash_title=Shadow+Zone+Flash+Animation&flash_file=shadowzone&flash_width=220&flash_height=300
http://www.classzone.com/books/earth_science/terc/content/visualizations/es1009/es1009page01.cfm
Fault
A fracture in the crust of a planet (as the earth) or moon accompanied by a displacement of one side of the fracture with respect to the other .
Types of Faults
Normal Fault
A fault in which the hanging wall has moved downward relative to the footwall.
Reverse Fault
A fault in which the hanging wall has moved upward relative to the footwall.


Strike-Slip Fault
vertical (or nearly vertical) fractures where the blocks have mostly moved horizontally

Seismic Waves
Waves created by movement along a fault.
Provide insight into the makeup of Earth's interior
P-Waves
Primary
Compressional (like a slinky)
solids and liquids
S-waves
Secondary
Shear(Transverse wave)
solids only
Surface Waves
Finding Epicenters
The difference between P and S wave arrival time is used to determine distance to epicenter.
http://www.eram.k12.ny.us/education/page/download.php?fileinfo=RmluZGluZ0VwaWNlbnRlci5zd2Y6Ojovd3d3L3NjaG9vbHMvc2MvcmVtb3RlL2ltYWdlcy9kb2NtZ3IvNDQ2ZmlsZTU4NjIuc3dm&sectiondetailid=17500
Shadow Zones
Due to the difference in densities of the material that makes up Earth's interior.
P-waves: solids and liquids
S-wave: solids only
Measuring Earthquake
damage and energy

Richter scale
vs.
Mercalli Scale
Full transcript