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Joshua Smith

on 4 February 2014

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Transcript of Earthquakes


Sudden release of built up energy inside the Earth.
due to movement along faults.
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
Compressional (like a slinky)
solids and liquids
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.
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
Mercalli Scale
Full transcript