S1222a – The Largest Marsquake Detected by InSight
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Date
2023-03-16
Publication Type
Journal Article
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yes
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Abstract
NASA’s InSight has detected a large magnitude seismic event, labelled S1222a. The event has a moment magnitude of M(Ma)(W)4.7, with 5 times more seismic moment compared to the second largest even. The event is so large that features are clearly observed that were not seen in any previously detected events. In addition to body phases and Rayleigh waves, we also see Love waves, minor arc surface wave overtones, and multi-orbit surface waves. At long periods, the coda event exceeds 10 hours. The event locates close to the North-South dichotomy and outside the tectonically active Cerberus Fossae region. S1222a does not show any evident geological or tectonic features. The event is extremely rich in frequency content, extending from below 1/30 Hz up to 35 Hz. The event was classified as a broadband type event; we also observe coda decay and polarization similar to that of very high frequency type events.
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Publication status
published
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Editor
Book title
Journal / series
Volume
50 (5)
Pages / Article No.
Publisher
American Geophysical Union
Event
Edition / version
Methods
Software
Geographic location
Date collected
Date created
Subject
Mars; Seismology; InSight; Body waves; Surface waves; Tectonics
Organisational unit
03476 - Giardini, Domenico / Giardini, Domenico
02818 - Schweiz. Erdbebendienst (SED) / Swiss Seismological Service (SED)
Notes
Funding
ETH-06 17-2 - Exploring the shallow subsurface of Mars with seismic methods (ETHZ)