AI Insight
Scientists have reanalyzed data from the Viking 2 Mars lander's seismometer from 1976 and identified a signal that may represent an actual marsquake originating from a region of Mars that showed seismic activity decades later. The original Viking missions included seismometers to study Mars's interior similar to how earthquakes reveal Earth's internal structure, but Viking 1's instrument failed to deploy and Viking 2's data were initially considered ambiguous with only two potential events recorded. This new analysis suggests at least one of those signals could be a genuine seismic event from a geologically active area.
Why it matters
This finding validates the potential scientific value of the decades-old Viking data and suggests Mars may have more seismic activity than initially concluded. The connection between the 1976 signal and a region that later showed activity provides evidence for ongoing geological processes on Mars and could inform future seismic monitoring missions.
Understand the Science
Earthquakes and the seismic waves they generate provide some of the best clues to Earth’s interior. To extend that success to other worlds, scientists placed seismometers on the Apollo missions to the moon and on the Viking Mars landers, which reached Mars in 1976. Though the Apollo detectors proved a resounding success, Viking’s results on Mars were less clear: Viking 1’s seismometer failed to deploy properly, and Viking 2 recorded only two ambiguous events.
Source: Reexamined Viking 2 signal reveals possible marsquake from region active decades later