From the Planetary Society Blogpost InSight Update, sols 25-42: Seismometer sensors working! Tricky setup and cable management on Mars
This is an animated GIF: It's fairly subtle, you may not notice at first!
IPGP / David Ducros
Animation showing the "recentering" operation of the InSight seismometer's Very Broad Band (VBB) seismic pendulums. Recentering is a calibration activity that fine-tunes the instrument's sensitivity to slow seismic waves. There are three VBB sensors in the SEIS instrument.
In some more technical detail, what is the effect of the recentering operation on the VBB seismic pendulums? Is it as simple as just making sure their equilibrium position is centered (which doesn't sound like a proper calibration) or is there more going on?