Over forty years ago while visiting the Moon, astronauts left seismometers that sent data back to the scientists waiting on good old terra firma for results. These seismometers were left active for over a decade and now many years later a professor from Notre Dame and his team set to work once again looking at the data.
What they found is that the Moon has earthquakes or “moonquakes” as it were. Apparently there are several different kinds of quakes that can happen on the Moon. The first are hundreds of miles below the surface, some are simply vibrations set off by meteorites striking the surface. Still others are simply due to thermal expansion. and then there are the shallow moonquakes, the ones that, according to the scientists, we need to watch out for. These are only tens of miles below the surface and can reach a 5.5 on the Richter scale. However, quakes on the Moon have some features that differ from ours and make them more intense. Many of these shallow moonquakes went on for a good ten minutes, and the researcher in charge said the Moon was “ringing like a bell”. Learning more about these quakes is very important if any country is ever to set up a base on the Moon.