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Seismic near-surface investigations at the InSight landing site

Schmelzbach, C. and Sollberger, D. and Stähler, S. and Grott, Matthias and Robertsson, J. and Giardini, D. (2023) Seismic near-surface investigations at the InSight landing site. In: 84th EAGE Annual Conference & Exhibition, pp. 1-5. 84th EAGE Annual Conference & Exhibition, 2023-06-05 - 2023-06-08, Wien. doi: 10.3997/2214-4609.2023101161. ISSN 2214-4609.

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Official URL: https://www.earthdoc.org/content/papers/10.3997/2214-4609.2023101161

Abstract

NASA’s InSight mission was the first mission to install a geophysical observatory on Mars, including a seismometer that allowed us to investigate the shallow subsurface with seismic techniques. To date, the seismic investigations of the subsurface at the InSight landing site included the analysis of the traveltimes of seismic waves emitted during the hammering of the heat probe, the compliance inversion of atmospheric pressure signals, and the inversion of frequency-dependent Rayleigh wave ellipticity from ambient vibrations. These results allowed us to establish a near-surface model consisting of a very low-velocity (vp » 120 m/s; vs » 60 m/s) layer at the top interpreted as low-density, high-porosity impact-fragmented regolith of sand-sized particles. Seismic velocities increase in the topmost metres with a boundary at a few meters depth, where the regolith transitions into fragmented basaltic lava. Seismic S-wave velocities >700 m/s below around 20 m depth are interpreted as shallow high-velocity Amazonian age basalt flows. A low-velocity (vs <500 m/s) zone at 30–75 m depth was associated with a sedimentary layer laying above older Amazonian or Hesperian age basalt flows with vs >1’500 m/s. A deep sedimentary layer has been proposed at around 175 m depth.

Item URL in elib:https://elib.dlr.de/193352/
Document Type:Conference or Workshop Item (Speech)
Title:Seismic near-surface investigations at the InSight landing site
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Schmelzbach, C.ETH Swiss Federal Institute of Technology, Zurich, SwitzerlandUNSPECIFIEDUNSPECIFIED
Sollberger, D.ETH Swiss Federal Institute of Technology, Zurich, SwitzerlandUNSPECIFIEDUNSPECIFIED
Stähler, S.ETH, SwitzerlandUNSPECIFIEDUNSPECIFIED
Grott, MatthiasUNSPECIFIEDhttps://orcid.org/0000-0002-8613-7096UNSPECIFIED
Robertsson, J.ETH Swiss Federal Institute of Technology, Zurich, SwitzerlandUNSPECIFIEDUNSPECIFIED
Giardini, D.Institute of Geophysics/Swiss Seismological Service, Swiss Federal Institute of Technology, (ETHZ), Honggerberg, CH-3093 Zurich, SwitzerlandUNSPECIFIEDUNSPECIFIED
Date:2023
Journal or Publication Title:84th EAGE Annual Conference & Exhibition
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
DOI:10.3997/2214-4609.2023101161
Page Range:pp. 1-5
ISSN:2214-4609
Status:Published
Keywords:Mars InSight SEIS seismology marsquakes interior structure
Event Title:84th EAGE Annual Conference & Exhibition
Event Location:Wien
Event Type:international Conference
Event Start Date:5 June 2023
Event End Date:8 June 2023
Organizer:European Association of Geoscientists and Engineers
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 Sensor Systems
Deposited By: Grott, Dr.rer.nat. Matthias
Deposited On:24 Jul 2023 09:24
Last Modified:24 Apr 2024 20:54

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