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Re-evaluation of Apollo 17 Lunar Seismic Profiling Experiment data

Heffels, Alexandra and Knapmeyer, Martin and Oberst, Jürgen and Haase, I. (2017) Re-evaluation of Apollo 17 Lunar Seismic Profiling Experiment data. Planetary and Space Science, 135, pp. 43-54. Elsevier. DOI: 10.1016/j.pss.2016.11.007 ISSN 0032-0633

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Official URL: http://dx.doi.org/10.1016/j.pss.2016.11.007

Abstract

We re-analyzed Apollo 17 Lunar Seismic Profiling Experiment (LSPE) data to improve our knowledge of the subsurface structure of this landing site. We use new geometrically accurate 3-D positions of the seismic equipment deployed by the astronauts, which were previously derived using high-resolution images by Lunar Reconnaissance Orbiter (LRO) in combination with Apollo astronaut photography. These include coordinates of six Explosive Packages (EPs) and four geophone stations. Re-identified P-wave arrival times are used to calculate two- and three-layer seismic velocity models. A strong increase of seismic velocity with depth can be confirmed, in particular, we suggest a more drastic increase than previously thought. For the three-layer model the P-wave velocities were calculated to 285, 580, and 1825 m/s for the uppermost, second, and third layer, respectively, with the boundaries between the layers being at 96 and 773 m depth. When compared with results obtained with previously published coordinates, we find (1) a slightly higher velocity (+4%) for the uppermost layer, and (2) lower P-wave velocities for the second and third layers, representing a decrease of 34% and 12% for second and third layer, respectively. Using P-wave arrival time readings of previous studies, we confirm that velocities increase when changing over from old to new coordinates. In the three-layer case, this means using new coordinates alone leads to thinned layers, velocities rise slightly for the uppermost layer and decrease significantly for the layers below.

Item URL in elib:https://elib.dlr.de/109959/
Document Type:Article
Title:Re-evaluation of Apollo 17 Lunar Seismic Profiling Experiment data
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Heffels, Alexandraalexandra.heffels (at) dlr.dehttps://orcid.org/0000-0002-9266-8061
Knapmeyer, MartinMartin.Knapmeyer (at) dlr.dehttps://orcid.org/0000-0003-0319-2514
Oberst, Jürgenjuergen.oberst (at) dlr.deUNSPECIFIED
Haase, I.technical university of berlin, berlin, germanyUNSPECIFIED
Date:2017
Journal or Publication Title:Planetary and Space Science
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:135
DOI :10.1016/j.pss.2016.11.007
Page Range:pp. 43-54
Publisher:Elsevier
ISSN:0032-0633
Status:Published
Keywords:Apollo 17, LSPE, Lunar Seismic Profiling Instrument, Moons, subsurface
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Science and Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Erforschung des Weltraums
DLR - Research theme (Project):R - Vorhaben Exploration des Sonnensystems
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Physics
Institute of Planetary Research > Planetary Geodesy
Deposited By: Heffels, Alexandra
Deposited On:22 Dec 2016 09:53
Last Modified:11 Dec 2017 11:35

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