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In May of last year, NASA's Insight Mars lander detected an enormous seismic tremor reverberating just below the planet's surface. At a magnitude 4.7, it's the most powerful ever detected on the Red Planet — and indeed anywhere off world.
Initially, the most likely explanation scientists put forward was that the reverberations could have been caused by a meteoroid impact., found that after months of scouring the planet's surface, no evidence of a fresh impact has been discovered — meaning the tremendous tremor came from deep within the planet.It would be a hard impact to miss. Anything large enough to send out a record-shattering marsquake after smashing into the surface would blow open a crater hundreds of feet in diameter.
Most of the data gathered about Mars' seismic activity so far indicates that it's originating from a huge pair of trenches known as the Cerberus Fossae, which are believed to be the open wounds of an underlying fault where magma interactions could still persist.
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