Science

Reexamined Viking 2 signal reveals possible marsquake from region active decades later

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Briefings

A reanalysis of Viking 2's seismometer data suggests a possible marsquake originating from a region active decades later, challenging previous interpretations of the ambiguous events. The study utilizes seismometer data from Viking 2, which reached Mars in 1976, to investigate seismic activity. Key findings include the identification of a potential marsquake source and the observation of a region active decades later, though the evidence remains preliminary and subject to further verification.

Key points

• Viking 2's seismometer recorded only two ambiguous events during its Mars landing in 1976.
• A reanalysis suggests a possible marsquake from a region active decades later, challenging previous interpretations.

Context

Seismometers placed on the Apollo missions to the moon and Viking Mars landers, which reached Mars in 1976, provided clues about Earth's interior. Viking 1's seismometer failed to deploy properly, and Viking 2 recorded only two ambiguous events. This reanalysis aims to extend those clues to other worlds.

Limitations

The evidence is limited to two ambiguous events recorded by Viking 2's seismometer. The reanalysis is preliminary and subject to further verification. No additional background or context is supplied beyond the provided evidence.

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