The Moon is shrinking – and shaking as it does, according to new Nasa data.Over the last decade, scientists have established that as the inside of the Moon cooled, it shrivelled up a like a raisin. That left it riven with cliffs called 'thrust faults', marked all over its surface.Now a new
Over the last decade, scientists have established that as the inside of the Moon cooled, it shrivelled up a like a raisin. That left it riven with cliffs called"thrust faults", marked all over its surface.
The faults form when the crust moves around, and one part of the crust is pushed up over another. They form unusual-looking cliffs that can be seen from the surface, standing tall and many miles long. Comparing the two, they found that at least eight of the rumbles were coming from movement of plates beneath the Moon's surface, not from asteroid impacts or other explanations. That helped confirm that the Moon is still experiencing true tectonic activity, according to the new paper published in Nature Geoscience.
The seismic data was taken from instruments that astronauts dropped onto the surface during Apollo missions. The one left by Apollo 11 died after a few weeks – but the rest kept measuring, eventually picking up 28 different, shallow moonquakes between 1969 and 1977.
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