Good Vibrations!
The first reports of ground vibrations on Mars show the red planet has a moderate level of seismic activity, intermediate between Earth and the Moon. This seismogram of a marsquake detected by the InSight seismometer on Sol 235 reveals two types of waves, a compression wave and a shear wave, demonstrated with a slinky by InSight team members Vedran Lekic and Nicholas Schmerr from the University of Maryland. This is the type of quake caused by plate tectonics on earth and the two waves can tell scientists a lot about the interior of the planet.
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SCRIPT:
Vedran Lekic, Associate Professor, University of Maryland Department of Geology:
What we’re looking at here is a record of ground vibrations on Mars, So this is the acceleration of the ground in the up/down direction, and what’s really exciting about this seismogram from Mars is that we see two types of waves coming in.
A “P” wave which is a compression wave, and an “S” wave, a shear wave.
And as you can see from Nick’s demonstration, these travel at different speeds through Mars which tells us about what kind of rocks Mars is made of.
