USGS · 70168759
Earthquakes, March-April 1991
Abstract
Two major earthquakes (7.0-7.9) occurred during this reporting period: a magnitude 7.6 in Costa Rica on April 22 and a magntidue 7.0 in the USSR on April 29. Destructive earthquakes hit northern Peru on April 4 and 5. There were no destructive earthquakes in the United States during this period.
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W. J. Person. 1992. Earthquakes, March-April 1991. https://pubs.usgs.gov/publication/70168759
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