Today’s Earthquake Fact
East Coast earthquakes are felt over a much larger area than earthquakes occurring on the West Coast, because the eastern half of the country is mainly composed of older rock that has not been fractured and cracked by frequent earthquake activity in the recent geologic past. Rock that is highly fractured and crushed absorbs more seismic energy than rock that is less fractured.
Today in Earthquake History
April 23, 1984
M 4.4, Pennsylvania – This earthquake was centered near Marticville. It caused minor damage at Conestoga, where a garage shifted 1.3 centimeters off its foundation; plaster… Read More