Universität zu Köln

Hobiger, M., Hallo, M., Schmelzbach, C., Staehler, S. C., Faeh, D., Giardini, D., Golombek, M., Clinton, J., Dahmen, N., Zenhaeusern, G., Knapmeyer-Endrun, B., Carrasco, S., Charalambous, C., Hurst, K., Kedar, S. and Banerdt, W. B. (2021). The shallow structure of Mars at the InSight landing site from inversion of ambient vibrations. Nat. Commun., 12 (1). BERLIN: NATURE PORTFOLIO. ISSN 2041-1723

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Abstract

We invert Rayleigh wave ellipticity curves extracted from ambient seismic vibrations at the InSight landing site to resolve, for the first time on Mars, the shallow subsurface to around 200 m depth. While our seismic velocity model is largely consistent with the expected stacks of lava flows, we find a seismic low velocity zone at about 30 to 75 m depth that we interpret as a sedimentary layer sandwiched between layers of basalt flows. Orbital and surface observations can shed light on the internal structure of Mars. NASA's InSight mission allows mapping the shallow subsurface of Elysium Planitia using seismic data. In this work, we apply a classical seismological technique of inverting Rayleigh wave ellipticity curves extracted from ambient seismic vibrations to resolve, for the first time on Mars, the shallow subsurface to around 200 m depth. While our seismic velocity model is largely consistent with the expected layered subsurface consisting of a thin regolith layer above stacks of lava flows, we find a seismic low-velocity zone at about 30 to 75 m depth that we interpret as a sedimentary layer sandwiched somewhere within the underlying Hesperian and Amazonian aged basalt layers. A prominent amplitude peak observed in the seismic data at 2.4 Hz is interpreted as an Airy phase related to surface wave energy trapped in this local low-velocity channel.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Hobiger, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hallo, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Schmelzbach, C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Staehler, S. C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Faeh, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Giardini, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Golombek, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Clinton, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Dahmen, N. UNSPECIFIED UNSPECIFIED UNSPECIFIED Zenhaeusern, G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Knapmeyer-Endrun, B. UNSPECIFIED UNSPECIFIED UNSPECIFIED Carrasco, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Charalambous, C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hurst, K. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kedar, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Banerdt, W. B. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-592003
DOI:	10.1038/s41467-021-26957-7
Journal or Publication Title:	Nat. Commun.
Volume:	12
Number:	1
Date:	2021
Publisher:	NATURE PORTFOLIO
Place of Publication:	BERLIN
ISSN:	2041-1723
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language ELYSIUM PLANITIA; WAVE; ELLIPTICITY; SCATTERING; MISSION; MOTION; MODEL Multiple languages Multidisciplinary Sciences Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/59200