WITHDRAWN Swarm Events Observed by Insight
Description:
WITHDRAWN NASA's InSight mission has collected a rich seismic dataset, offering an unprecedented glimpse into Mars’ seismicity despite challenges such as commonly poor signal-to-noise ratios and single-station limitations. The Marsquake Service catalogues seismic events by their frequency content [1], with high frequency (HF) events being most commonly observed, yet least well understood. In light of new constraints from the observations of meteorite impacts and surface waves [2,3,4], we interpret HF event energy as propagating through Mars’ mantle rather than shallow crustal layers, as previously thought.
By mining the full denoised data of HF events [4] and applying deep learning phase pickers on HF envelopes, we provide epicentral distances with the latest set of Mars interior models and updated magnitudes. Further, we compare their signal similarity, and analyse their envelope shape in the context of Mars’ attenuation properties.
Our final catalogue includes 1430 HF events (re)located at around 2,600 km distance from InSight (+160% events with distance&magnitude). We investigate potential source regions, but given unclear polarisation, their full location remains speculative. Based on signal- and spatiotemporal similarities, we attribute the vast majority to a single source region and classify this subset as swarm events. These events have magnitudes around M1.5-2.5, a high b-value, strong seasonal rates, and a cumulative energy release equivalent to an M4 quake. For the remaining HF events, we propose alternative sources, such as meteorite impacts.
As a result, swarm events represent one of the main sources of seismic activity observed by InSight, alongside tectonic quakes, meteorite impacts and local thermal events.
Session: Exploring Planetary Interiors and Seismology: Observations, Models, Experiments and Future Missions [Poster]
Type: Poster
Date: 4/17/2025
Presentation Time: 08:00 AM (local time)
Presenting Author: Nikolaj
Student Presenter: No
Invited Presentation:
Poster Number: 100
Authors
Nikolaj Dahmen Presenting Author Corresponding Author nikolaj.dahmen@erdw.ethz.ch ETH Zurich |
John Clinton jclinton@sed.ethz.ch ETH Zurich |
Simon Stähler simon.staehler@eaps.ethz.ch ETH Zurich |
Savas Ceylan savas.ceylan@eaps.ethz.ch ETH Zurich |
Domenico Giardini domenico.giardini@eaps.ethz.ch ETH Zurich |
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WITHDRAWN Swarm Events Observed by Insight
Session
Exploring Planetary Interiors and Seismology: Observations, Models, Experiments and Future Missions