'Finally we know Mars is seismically active; we know it’s talking to us,' principal investigator Bruce Banerdt said.
Mars By Sarah Kaplan Sarah Kaplan Reporter for Speaking of Science Email Bio Follow April 24 at 3:09 PM For months, the spacecraft sat very still in the vast, empty expanse of a flat Martian plain, alone and undisturbed but for the thin whine of an alien wind.
Then, on April 6, InSight’s seismometer picked up a faint, eerie rumble — the sound, scientists say, of what is probably the first quake recorded on the surface of another planet.Now, he continued, “it’s just a matter of being patient, waiting and listening, and collecting the quakes as they come along.”
“It’s almost like an X-ray,” Banerdt said. The spacecraft’s exquisitely sensitive seismometer can track subtle changes in the waves as they pass through Mars’s crust, mantle and core. Finally, they decided that the signal must have come from a very small quake — about magnitude 2 or 2.5. Dozens of temblors just like it occur in Southern California every day, utterly unnoticed amid the noise of human activity and ocean waves.
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