Marsquakes rock and roll

phys.org | 4/23/2019 | Staff
Cayley1561 (Posted by) Level 3
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Fifty years after Apollo 11 astronauts deployed the first seismometer on the surface of the moon, NASA InSight's seismic experiment transmits data giving researchers the opportunity to compare marsquakes to moon and earthquakes.

Seismologists operating the Marsquake Service at ETH Zurich literally rocked and rolled as they experienced, for the first time, two "marsquakes" in the university's quake simulator. Researchers uploaded actual data from marsquakes detected on Martian solar day or Sol 128 and 173.The marsquakes were detected by the SEIS seismometer, whose highly sensitive electronics were delivered by the Aerospace Electronics and Instruments laboratory at ETH.

SEIS - Seismometer - Signals - Mars - Researchers

SEIS contains arguably the most sensitive seismometer ever operated, capable of detecting even the faintest seismic signals on Mars. Researchers had to amplify the marsquake signals by a factor of 10 million in order to make the quiet and distant tremors perceptible in ETH Zurich's quake simulator and to compare them with a similarly amplified moon and earthquake.

"We are currently observing two families of quakes on Mars," says Dr. Simon Stähler. "The first quake was a high frequency event more similar to a moonquake than we expected. The second quake was a much lower frequency, and we think this may be due to the distance. The lower frequency quake likely occurred further away from the seismometer. Compared to the duration of earthquakes, both types of the marsquakes last longer."

Waves - Earth - Seconds - Minutes - Moonquakes

While seismic waves that travel through the Earth typically persist between 10s of seconds to a few minutes, moonquakes can last up to an hour or more. The extent of the seismic signal is due to distance and to differences in geological structures. If one compares the surfaces of the Earth and the moon, it might be surprising to learn that the Earth's crust is more homogeneous than that of the moon. Billions of years of meteorite...
(Excerpt) Read more at: phys.org
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