Michele W. Berger | Nov. 4, 2013 | Weather.com
Ever experienced an earthquake? The shaking — sometimes severe, sometimes mild — starts as quickly as it stops, the result of movement deep within the Earth’s layers. We feel the vibrations because of seismic waves, energy that “radiates outward from the fault in all directions,” according to the U.S. Geological Survey, “like ripples on a pond.”
Believe it not, something similar happens on the moon, and it’s called — you may have guessed it — a moonquake.
“The Apollo seismometers were all in one relatively small region on the front side of the moon,” said Clive R. Neal, associate professor of civil engineering and geological sciences at Notre Dame, to Bell. “We’re especially ignorant of the lunar poles.”