https://essopenarchive.org/users/527743/articles/673415-new-views-of-lunar-seismicity-brought-by-analysis-of-newly-discovered-moonquakes-in-apollo-short-period-seismic-data

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13,815
1
New Views of Lunar Seismicity Brought by Analysis of Newly Discovered
Moonquakes in Apollo Short-Period Seismic Data

  * [slZOAAAAF3]

  * Keisuke Onodera[orcid-ca37]

Keisuke Onodera
[orcid-ca37]
The University of Tokyo

Corresponding Author:[email protected]

Author Profile
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Abstract

In the 1970s, two types of seismometers were installed on the
nearside of the Moon. One type is called the Long-Period (LP)
seismometer, which is sensitive below 1.5 Hz. The other is called the
Short-Period (SP) seismometer, whose sensitivity is high around 2 -
10 Hz. So far, more than 13,000 seismic events have been identified
through LP data analyses, which allowed us to investigate lunar
seismicity and the internal structure. On the other hand, most of the
SP data have remained unanalyzed because they include numerous
unnatural signals and/or instrumental noises. This fact leads to the
hypotheses that (i) we have missed lots of high-frequency seismic
events and (ii) lunar seismicity could be underestimated. To verify
these ideas, this study conducted an analysis of the SP data. In the
analysis, I denoised the original SP data and performed the event
detections by comparing the spectral features between the cataloged
high-frequency events (such as shallow moonquakes) and the continuous
SP data. Eventually, I discovered 22,000 new seismic events,
including thermal moonquakes, impact-induced events, and shallow
moonquakes. Among these, I focused on analyzing shallow moonquakes --
tectonic-related quakes. Consequently, it turned out that there are
nearly three times more tectonic events than considered before.
Furthermore, additional detections of shallow moonquakes enabled me
to see the regionality in seismicity. Comparing three landing sites
(Apollo 14, 15, and 16), I found that the Apollo 15 site is more
seismically active than others. These findings can change the
conventional views of lunar seismicity.

Peer review timeline

20 Oct 2023Submitted to ESS Open Archive  
27 Oct 2023Published in ESS Open Archive
ESS Open Archive

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