Pressure ridge

Type of topographic ridge

A pressure ridge is a topographic ridge produced by compression.

Depending on the affected material, "pressure ridge" may refer to:

* Pressure ridge (ice), between ice floes[1]
* Pressure ridge (lava), in a lava flow[1]
* Pressure ridge (seismic), in a fault zone[1]

In a seismic context, a pressure ridge can range in size from a few-metres-long mound, to a kilometres-long lateral ridge.[2] It is the result of one or several earthquakes occurring on certain types of fault geometries, such as compressional bends or stepovers along strike-slip faults.[2][3] A pressure ridge can for instance be the result of a deep-set obstruction on the fault plane, which leads to material being pushed up during earthquakes.[2]

## See also

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* Earth sciences portal

* Ridge (meteorology), an elongated area of relatively high atmospheric pressure

## References

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1. ^ a b c Neuendorf, K.K.E.; Mehl, J.P. Jr.; Jackson, J.A., eds. (2005). Glossary of Geology (5th ed.). Alexandria, Virginia: American Geological Institute. p. 514\. ISBN 978-0922152896.
2. ^ a b c "Pressure Ridge: Dragon's Back Pressure Ridge, Carrizo Plain National Monument". OpenTopography: High-Resolution Topography Data and Tools. La Jolla, CA: OpenTopography Facility, University of California San Diego. Retrieved 18 August 2022.
3. ^ Štěpančíková, Petra. "Transpression; Pressure ridge" (PDF). Tectonic geomorphology and paleoseismology. Prague, Czech Republic: Czech Academy of Sciences, Department of Engineering Geology, Institute of Rock Structure and Mechanics. Retrieved 9 June 2022.

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