This is the third major quake InSight has detected in a month
The quakes might not have been detected at all had the mission not taken action earlier in the year, as Mars’ highly elliptical orbit took it farther from the Sun. Lower temperatures required the spacecraft to rely more on its heaters to keep warm; that, plus dust buildup on InSight’s solar panels, has reduced the lander’s power levels, requiring the mission to conserve energy by temporarily turning off certain instruments.
The team managed to keep the seismometer on by taking a counterintuitive approach: They used InSight’s robotic arm to trickle sand near one solar panel in the hopes that, as wind gusts carried it across the panel, the granules would sweep off some of the dust. The plan worked