The event of February 16, 1956, 2330 GMT,1 allegedly caused modified Mercalli intensity V and VI effects in North-Central Oklahoma and was felt and (or) heard over an area of 13,000 km2 to 22,000 km2. According to instrumental data, this event could not have been an earthquake of magnitude (mbLg) greater than 3. The event was probably a sequence of sonic booms from aircraft.

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