According to ALSEP Flight System Familiarization Manual, p. 2-166, some Apollo missions carried a grenade launcher and 4 grenades. What were these used for?

  • $\begingroup$ For the seismic experiments $\endgroup$ – JCRM Jul 29 '19 at 15:04
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    $\begingroup$ See space.stackexchange.com/a/37774/6944 $\endgroup$ – Organic Marble Jul 29 '19 at 15:05
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    $\begingroup$ Even more fun, Apollo 14 didn't use their grenades, and they are still on the lunar surface. $\endgroup$ – DrSheldon Jul 29 '19 at 19:02
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    $\begingroup$ Due to an influx of joke comments, all joke comments on this post will be deleted. However, we would appreciate your sense of humor in chat if you want to drop by! $\endgroup$ – called2voyage Jul 31 '19 at 16:49
  • $\begingroup$ Have any of them been used? $\endgroup$ – Everyday Astronaut Aug 1 '19 at 10:17

They were part of an active seismic imaging experiment (archived version on wayback)

By setting up a seismometer and setting off surface explosions of known size, you can get a lot of information about how shockwaves propagate underground, from which you can infer structure.

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