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Stratigraphic Cross Section—Interpreting the Geology (Educational)

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Uploaded on Jan 23, 2012

http://www.iris.edu/hq/inclass/search...

This animation shows a hypothetical cross section of the Earth, then takes you back to the beginning to walk you through the steps that would create this scenario.
Why study stratigraphy? And how does this relate to earthquakes?
The earthquake potential of an area can be determined by studying the relationships between rock strata, both locally and regionally. Faults and folds record a probable earthquake history, so by studying the age of the rocks we can gain an understanding about future earthquakes (applying "the past is a key to the future"). This is done by doing field work, studying drill-hole samples, and interpreting seismic reflection data.
Animation by Jenda Johnson, Earth Sciences Animated
Reviewed by Randall Milstein, Oregon State University

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