The Mars lander "InSight" measured three large quakes on the red planet within four weeks - including one that caused the Mars ground to shake for around an hour and a half.
The first two quakes on August 25 had strengths of 4.2 and 4.1, the US space agency NASA announced on Wednesday.
The longest and strongest earthquake measured by "InSight" so far happened on September 18 - it was 4.2 and lasted around an hour and a half.
The fact that the stationary lander, which arrived on Mars in 2018, was able to measure the earthquakes at all, is also due to a trick the NASA researchers used to ensure the energy supply of the seismometer: they scattered sand near a solar cell with a robotic arm of the lander.
When the wind blew this over the solar cell, it also took a large part of the dust deposited there with it - and the solar cell was able to continue to supply the lander with energy.