Journal
PLANETARY AND SPACE SCIENCE
Volume 206, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.pss.2021.105307
Keywords
Apollo 17 lunar seismic profiling experiment; LSPE; Taurus Littrow Valley; Moon; Velocity-depth-profiles
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Funding
- Helmholtz Alliance Robotic Exploration of Extreme Environments ROBEX [HA-304]
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The study reanalyzed data from the Apollo 17 Lunar Seismic Profiling Experiment and found a significant increase in seismic wave velocity with depth, particularly with a more drastic increase in the velocity of the third layer.
We re-analyze data from the Apollo 17 Lunar Seismic Profiling Experiment (LSPE) using updated locations of the applied explosive sources. Specifically, we complement our models with the previously missing coordinates and P wave arrival times of Explosive Packages EP1 and EP7. We read new P-arrival times for all eight EP events, and solve for two-and three-layer seismic velocity models. We confirm a strong increase of seismic velocity with depth. In particular, we suggest a more drastic increase than was previously thought from post-mission coordinate information. For the three-layer model we find P-wave velocities of 315, 580, and 2680 m/s for the uppermost, second, and third layers respectively, with the transitions between the layers being at depths of 110 and 855 m. When compared with previous results, we find (1) a slightly higher velocity (+10.5%) for the uppermost layer, (2) no differences in velocity for the second layer, and a (3) significantly higher P-wave velocity for the third layer (+46.9%).
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