The middle Mississippi River valley frequently experiences earthquakes. Three earthquakes that occurred in late 1811 and early 1812 near New Madrid, Missouri may have been the strongest earthquakes in recorded history for North America . Surface movements from these earthquakes briefly reversed the flow of the Mississippi River and formed a large lake. Effects from these earthquakes were observed as far away as Boston , Massachusetts , and the quake may have been felt by Native Americans in the Austin area (Frohlich and Davis, 2002).
Below are three seismograms from a magnitude 3.0 (M 3) earthquake that occurred in the New Madrid area at approximately 3:46 AM on June 19, 1987.
Fill in the chart with the appropriate information for each seismogram.
The immediate and short-term tremble generated on the earth's surface that varies from a small tremor to a wide motion generated by the sudden release of energy stored in the rock beneath the earth's surface is termed an earthquake. From the point of origin, seismic waves are disseminated in all directions.
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