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high-aspect-ratio ignimbrite

A Dictionary of Earth Sciences | 1999 | 306 words | Copyright

high-aspect-ratio ignimbrite (HARI) An ignimbrite sheet displaying a value for the ratio of its average thickness (V) to its horizontal extent (H) of 10−2 to 10−3, where H is taken as the diameter of a circle with a surface area equal to that of the flow. Compare LOW-ASPECT-RATIO IGNIMBRITE.

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AILSA ALLABY and MICHAEL ALLABY. "high-aspect-ratio ignimbrite." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. 27 May. 2012 <http://www.encyclopedia.com>.

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