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High‐Frequency Seismic Events on Mars Observed by InSight

Driel, Martin van and Ceylan, S. and Clinton, J. and Giardini, D. and Horleston, A. and Margerin, L. and Stähler, S. and Böse, Maren and Charalambous, C. and Kawamura, T. and Khan, A. and Orhand‐Mainsant, G. and Scholz, J.-R. and Euchner, F. and Knapmeyer, Martin and Schmerr, N. and Pike, W.T. and Lognonne, P. and Banerdt, W.B. (2021) High‐Frequency Seismic Events on Mars Observed by InSight. JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS, 126 (2), e2020JE006670. Wiley. doi: 10.1029/2020JE006670. ISSN 2169-9097.

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Official URL: http://dx.doi.org/10.1029/2020JE006670


The seismometer deployed on the surface of Mars as part of the InSight mission (Interior Exploration using Seismic Investigations, Geodesy and Heat Transport) has recorded several hundreds of marsquakes in the first 478 sols after landing. The majority of these are classified as high-frequency (HF) events in the frequency range from approximately 1 to 10 Hz on Mars' surface. All the HF events excite a resonance around 2.4 Hz and show two distinct but broad arrivals of seismic energy that are separated by up to 450 s. Based on the frequency content and vertical-to-horizontal energy ratio, the HF event family has been subdivided into three event types, two of which we show to be identical and only appear separated due to the signal-to-noise ratio. We show here that the envelope shape of the HF events is explained by guided Pg and Sg phases in the Martian crust using simple layered models with scattering. Furthermore, the relative travel times between these two arrivals can be related to the epicentral distance, which shows distinct clustering. The rate at which HF events are observed varies by an order of magnitude over the course of one year and cannot be explained by changes of the background noise only. The HF content and the absence of additional seismic phases constrain crustal attenuation and layering, and the coda shape constrains the diffusivity in the uppermost shallow layers of Mars.

Item URL in elib:https://elib.dlr.de/142294/
Document Type:Article
Title:High‐Frequency Seismic Events on Mars Observed by InSight
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Driel, Martin vanInstitute of Geophysics, ETH Zurich, Zurich, SwitzerlandUNSPECIFIED
Ceylan, S.Institute of Geophysics, ETH Zurich, SwitzerlandUNSPECIFIED
Clinton, J.Swiss Seismological Service, ETH Zürich, Zürich, SwitzerlandUNSPECIFIED
Giardini, D.Institute of Geophysics, Department of Earth Sciences, ETH Zurich, Zurich, SwitzerlandUNSPECIFIED
Horleston, A.University of BristolUNSPECIFIED
Margerin, L.Institut de Recherche en Astrophysique et PlanétologieUNSPECIFIED
Stähler, S.Institute of Geophysics, ETH Zurich, SwitzerlandUNSPECIFIED
Böse, MarenSwiss Seismological Service, ETH Zurich, Zurich, SwitzerlandUNSPECIFIED
Charalambous, C.Department of Electrical and Electronic Engineering, Imperial College, South Kensington Campus, London, UKUNSPECIFIED
Kawamura, T.Université de Paris, Institut de physique du globe de Paris, CNRS, Paris, FranceUNSPECIFIED
Khan, A.Institut für Geophysik, ETH Zürich, Switzerland; Institute of Theoretical Physics, University of Zurich, Zurich, SwitzerlandUNSPECIFIED
Orhand‐Mainsant, G.ISAE-SUPAERO, Toulouse University, Toulouse, FranceUNSPECIFIED
Scholz, J.-R.Max Planck Institute for Solar System Research, Göttingen, GermanyUNSPECIFIED
Euchner, F.Swiss Seismological Service, ETH Zurich, Zurich, SwitzerlandUNSPECIFIED
Knapmeyer, MartinMartin.Knapmeyer (at) dlr.dehttps://orcid.org/0000-0003-0319-2514
Schmerr, N.Department of Geology, University of Maryland, College Park, USAUNSPECIFIED
Pike, W.T.Department of Electrical and Electronic Engineering, Imperial College, London SW7 2AZ, UKUNSPECIFIED
Lognonne, P.Institut de Physique du Globe, Paris, FranceUNSPECIFIED
Banerdt, W.B.Jet Propulsion Laboratory, California Institute of Technology, Pasadena, USAUNSPECIFIED
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1029/2020JE006670
Page Range:e2020JE006670
Keywords:Mars InSight Marsbeben
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:19 May 2021 09:32
Last Modified:19 Nov 2021 20:31

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