USGS · 70162480
Earthquake history of Oklahoma
Abstract
The strongest and most widely felt earthquake in Oklahoma occurred on April 9, 1952. The intensity VII (Modified Mercalli Scale) tremor was felt over 362,000 sqaure kilometres. A second intensity VII earthquake, felt over a very small area, occurred in October 1956. In addition, 15 other shocks, intensity V or VI, have originated within Oklahoma.
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C. A. von Hake. 1976. Earthquake history of Oklahoma. https://pubs.usgs.gov/publication/70162480
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