Essay on San Andrea Fault

479 Words 2 Pages
San Andrea Fault

Introduction

The San Andreas Fault is a geologic fault zone between two tectonic plates that runs from San Francisco south to San Diego in California. It is an area of frequent earthquakes caused by the plates sliding past each other. It is so called because it runs along the San Andreas Valley.

The San Andreas fault was brought dramatically to world attention in 1906 when sudden displacement along the fault produced the great San Francisco earthquake and fire. This earthquake was but one of many that have resulted throughout its life of about 15-20 million years.

Body

The entire San Andreas fault system is more than 800 miles long and extends to depths of at least 10 miles within the Earth. The fault is
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And they are moving inexorably in opposite directions.

Conclusion

There are records of earthquakes on the southern San Andreas fault going back thousands of years and can estimate an average repeat time for certain segments of the fault. We understand that the Los Angeles Basin is being broadly compressed from north to south due to a ben in the San Andreas, and that the compression is causing the San Gabriel and Santa Monica Mountains to be pushed upward on systems of faults at their bases.
Scientists have mapped some of those faults and inferred the existence of others using sophisticated techniques.

Then why can’t we predict earthquakes? One reason could be that for the most part earthquakes process tens of miles below the earth’s surface away from easy observation and they play out over geologic time. Scientists are continually proposing and testing theories to understand the complexities of the plate tectonics. New Microscopes to study the grounds of earthquakes have for the first time made quake prevention something to look forward to in the future.

References

http://quake.wr.usgs.gov/info/essay.html

http://www.encyclopedia.com/articles/11408.html

http://dectionary.msn.com/find/entry.asp?refid=1861701053

http://www.scvresources.com/geology/san_andreas.htm

http://visearth.ucsd.edu/VisE_Int/aralsea/tutorial.html

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