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The InSight landerās job is to detect these quakes with its seismometer, which itās been doing since February 2019. The instrument provides scientists with extremely rich seismic data on two phenomena in particular: the P-waves and S-waves that marsquakes produce. āP-waves are compressional waves, like sound in air, and they are the fastest waves that we see moving through any planetary body,ā says University of Cologne seismologist Brigitte Knapmeyer-Endrun, lead author on the paper that modeled Marsā crust. āAnd then we have the secondary waves, the S-waves, the shear waves. The motion is more like if you pluck a string on a guitar and it swings.ā