Article Dans Une Revue Geophysical Research Letters Année : 2023

A Tectonic Origin for the Largest Marsquake Observed by InSight

Benjamin Fernando
Ingrid Daubar
Constantinos Charalambous
Abdullah Al Ateqi
Dimitra Atri
Ernest Hauber
Jonathon Hill
Ralph Lorenz
Lujendra Ojha
Daniela Tirsch
Natalia Wójcicka

Résumé

Abstract The S1222a marsquake detected by InSight on 4 May 2022 was the largest of the mission, at 4.7. Given its resemblance to two other large seismic events (S1000a and S1094b), which were associated with the formation of fresh craters, we undertook a search for a fresh crater associated with S1222a. Such a crater would be expected to be ∼300 m in diameter and have a blast zone on the order of 180 km across. Orbital images were targeted and searched as part of an international, multi‐mission effort. Comprehensive analysis of the area using low‐ and medium‐resolution images reveals no relevant transient atmospheric phenomena and no fresh blast zone. High‐resolution coverage of the epicentral area from most spacecraft are more limited, but no fresh crater or other evidence of a new impact have been identified in those images either. We thus conclude that the S1222a event was highly likely of tectonic origin.

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hal-04247218 , version 1 (18-10-2023)

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Benjamin Fernando, Ingrid Daubar, Constantinos Charalambous, Peter Grindrod, Alexander Stott, et al.. A Tectonic Origin for the Largest Marsquake Observed by InSight. Geophysical Research Letters, 2023, 50 (20), ⟨10.1029/2023GL103619⟩. ⟨hal-04247218⟩
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