Seismic sources of InSight marsquakes and seismotectonic context of Elysium Planitia, Mars

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Since its deployment, the SEIS (Seismic Experiment for Interior Structure) instrument (Lognonné et al., 2019) as part of the InSight (Interior Exploration using Seismic Investigations, Geodesy and Heat Transport) lander has been passively recording marsquakes (Banerdt et al., 2020) for over 1300 Sols (a Sol is a Martian day and corresponds to ∼24 hr 40 min) since landing, including ∼90 marsquakes at teleseismic distances with moment magnitudes (M w ) in the range 2.5-4.2 (

Section: Resultsmentioning

confidence: 99%

Observation of a Core‐Diffracted P‐Wave From a Farside Impact With Implications for the Lower‐Mantle Structure of Mars

Durán

Khan

Ceylan

et al. 2022

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“…The event appears to lie about 10° to the south of the farthest Eastern extent of Cerberus Fossae, by a considerably margin the most seismically active region on Mars (Giardini et al., 2020; Perrin et al., 2022; Rivas‐Dorado et al., 2022; Stähler et al., 2022; Zenhäusern et al., 2022). The majority of located seismic events locate within this region (Ceylan et al., 2022) and a clear link between the surface fault system and source mechanisms is suggested (Brinkman et al., 2021; Jacob et al., 2022). S1222a locates in a region closer to the North‐South dichotomy (Smith et al., 2001).…”

Section: Event Overviewmentioning

confidence: 99%

S1222a—The Largest Marsquake Detected by InSight

Kawamura

Clinton

Zenhäusern

et al. 2023

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104

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“…With the estimates of Martian seismicity available at the time, 1–10 events of M W 5.3 were predicted over the course of the mission, and so it was expected that this method could be applied to several of the largest events observed by InSight. In reality, both the daily wind‐induced noise that is much larger than 10 −9 m/s 2 /Hz 1/2 (e.g., Lognonné et al., 2020) and a seismicity generating mostly M W < 4 events (Brinkman et al., 2021; Ceylan et al., 2022; Clinton et al., 2020; Giardini et al., 2020; Jacob et al., 2022) has made this method impossible for events prior to S1222a. This was, therefore, the first event that exceeded the pre‐mission estimated magnitude threshold, and it provides an excellent test case for the method at last.…”

Section: Introductionmentioning

confidence: 99%

Locating the Largest Event Observed on Mars With Multi‐Orbit Surface Waves

Panning

Banerdt

Beghein

et al. 2023

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Prior to the 2018 landing of the InSight mission, the InSight science team proposed locating Marsquakes using multiple orbit surface waves, independent of seismic velocity models, for events larger than MW4.6. The S1222a MW4.7 of 4 May 2022 is the largest Marsquake recorded and the first large enough for this method. Group arrivals of the first three orbits of Rayleigh waves are determined to derive the group velocity, epicentral distance, and origin time. The mean distance of 36.9 ± 0.3° agrees with the Marsquake Service (MQS) distance based on body wave measurements of 37.0 ± 1.6°. The origin time from surface waves is systematically later than the MQS origin time by 20 s. Backazimuth estimation is similar to body wave estimations from MQS although suggesting a shift to the south. Backazimuth estimates from R2 and R3 are more scattered, but do show clear elliptical motion.