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The seismicity of Mars

Giardini, D. and Stähler, S. and van Driel, M and Clinton, J. and Knapmeyer, Martin and Lognonne, P. and Banerdt, B. (2020) The seismicity of Mars. 80. Jahrestagung der Deutschen Geophysikalischen Gesellschaft, München.

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Official URL: https://dgg2020.smart-abstract.com/sessionplanner/#/event/16775

Abstract

NASA’s InSight mission deployed the Seismic Experiment for Interior Structure (SEIS) instrument on Mars, with the goal of detecting, discriminating, characterizing and locating the seismicity of Mars and study its internal structure, composition and dynamics. 44 years since the first attempt by the Viking missions, SEIS has revealed that Mars is seismically active. So far, the Marsquake Service (MQS) has identified 365 events that cannot be explained by local atmospheric or lander-induced vibrations, and are interpreted as marsquakes. We identify two families of marsquakes: (i) 35 events of magnitude MW=3-4, dominantly long period in nature, located below the crust and with waves traveling inside the mantle, and (ii) 330 high-frequency events of smaller magnitude and of closer distance, with waves trapped in the crust, exciting an ambient resonance at 2.4Hz. Two long period events with larger SNR and excellent P and S waves occurred on Sol 173 and 235, visible both on the VBB and the SP channels; the location of these events has been determined at distances of 26°-30° towards the East, close to the Cerberus Fossae tectonic system. Over ten additional long period events show consistent body-wave phases interpreted as P and S phases and can be aligned with distance using models of P and S propagation. Marsquakes have spectral characteristics similar to seismicity observed on the Earth and Moon. From the spectral characteristics of the recorded seismicity and the event distance, we constrain attenuation in the crust and mantle, and find indications of a potential low S-wave-velocity layer in the upper mantle. In contrast, the high-frequency events provide important constraints on the elastic and anelastic properties of the crust. The first seismic observations on Mars deliver key new knowledge on the internal structure, composition and dynamics of the red planet, opening a new era for planetary seismology. Here we review the seismicity detected so far on Mars, including location, distance, magnitude, magnitude-frequency distribution, tectonic context and possible seismic sources.

Item URL in elib:https://elib.dlr.de/138331/
Document Type:Conference or Workshop Item (Speech)
Title:The seismicity of Mars
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Giardini, D.Institute of Geophysics, Department of Earth Sciences, ETH Zurich, Zurich, SwitzerlandUNSPECIFIED
Stähler, S.Institute of Geophysics, ETH Zurich, SwitzerlandUNSPECIFIED
van Driel, MInstitute of Geophysics, ETH Zurich, SwitzerlandUNSPECIFIED
Clinton, J.Swiss Seismological Service, ETH Zürich, Zürich, SwitzerlandUNSPECIFIED
Knapmeyer, MartinMartin.Knapmeyer (at) dlr.dehttps://orcid.org/0000-0003-0319-2514
Lognonne, P.institut de physique du globe, paris, franceUNSPECIFIED
Banerdt, B.Jet Propulsion Laboratory, USAUNSPECIFIED
Date:2020
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:InSight Mars Marsbeben
Event Title:80. Jahrestagung der Deutschen Geophysikalischen Gesellschaft
Event Location:München
Event Type:national Conference
Organizer:Deutsche Geophysikalische Gesellschaft
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Space Exploration
DLR - Research theme (Project):R - Project InSight - HP3
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Physics
Deposited By: Knapmeyer, Dr. Martin
Deposited On:26 Nov 2020 10:14
Last Modified:26 Nov 2020 10:14

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