https://www.nationalgeographic.com/scie ... und-mars2/
MILLIONS OF MILES away, a robot geologist stands alone on the dusty surface of Mars, listening for faint seismic echoes in the ground below. Its finger on the red planet’s pulse is sensitive enough to pick up the whoosh of wind, the drone of dust devils, the creak of tectonic cracks, and many other rumbles ricocheting though the planet’s insides.
While most of these signals have been indistinct murmurs, two have stood out loud and clear, allowing scientists to trace them back to their source: the first active fault zone yet found on the red planet.
Known as marsquakes, the events clocked in between magnitude 3 and 4, according to data from NASA’s InSight lander presented at a recent American Geophysical Union conference. While the two quakes are small by Earth standards, they’re among the largest yet detected on Mars. Scientists were able to trace both quakes to an area known as Cerberus Fossae, a series of deep gashes that lingers some 994 miles to the east of InSight’s landing zone.
Well it’s still dead just less dead than thought. 
If they were sure it was completely dead there wouldn’t have been any instruments to find the activity. Always good to check.
