The moon may be dynamic and tectonically active like Earth - not the inert world...
WASHINGTON - The moon may be dynamic and tectonically active like Earth - not the inert world some scientists had believed it to be - based on a new analysis disclosed on Monday of quakes measured by seismometers in operation on the moon from 1969 and 1977.
Researchers examining the seismic data gathered during NASA’s Apollo missions traced the location of some of the quakes to step-shaped cliffs called scarps on the lunar surface that formed relatively recently, in geological terms, due to the ongoing subtle shrinking of the moon as its hot interior cools.
Earth’s tectonic activity is driven by its hot interior. The moon, which orbits our planet at a distance of about 239,000 miles , has a diameter of about 2,160 miles , a bit more than a quarter of Earth’s diameter. These faults push one part of the lunar crust up and over the adjoining part, said University of Maryland geologist and study co-author Nicholas Schmerr. They can reach up to about 330 feet tall and extend for many miles .
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