NASA’s Lunar Reconnaissance Orbiter (LRO) issued the latest imaging analysis of the moon. Its said, the moon experienced shrinkage which made the lunar surface wrinkled and this was due to earthquake shocks.
This analysis is based on a survey of more than 12,000 images. All the images show that the moon basin of Mare Frigoris near the north pole of the moon cracked and shifted. The moon basin Mare Frigoris is one of many broad basins that are assumed to have no activity from geological point of view.
Unlike the earth, the moon does not have a tectonic plate. Conversely, tectonic activity in the moon occurs slowly because its losing thermal, since it was formed 4.5 billion years ago.
This in turn makes the lunar surface wrinkle, like grapes that shrinks into raisins.
As mentioned by AFP on Tuesday (05/14/2019), the moon has a fragile crust. When an earthquake occurs and the interior shrinks, the surface breaks easily and produces what is called a thrust fault, where one part of the crust is pushed up to the adjacent parts.
This ultimately made the moon “take care” about 50 meters over the past several hundred million years. Apollo astronauts first began measuring seismic activity on the Moon in the 1960s and 1970s.
They found seismic activity mostly occurred in the abdomen of the moon, and only a small amount occurred on its surface. In an analysis published in Nature Geoscience, experts examined shallow moon earthquakes recorded during the Apollo mission and then linked them to the new surface features of the moon.
“Possibly, the earthquake in the moon is still happening today. Maybe all this time we have only seen tectonic earthquakes shake the Earth, so knowing that the moon was also shaked by an earthquake I think is very interesting,” said Nicholas Schmerr, assistant professor of geology at the University of Maryland.