The semi-hollow moon

When the Lunar Module ascent stage of Apollo 12 was sent crashing into
the Moon, the seismological equipment recorded the shock waves.  The
results staggered NASA scientists.  The artificially created Moonquake
lasted 55 minutes!" 
  "Furthermore, the KIND of signals recorded by the seismometers shocked
scientists.  Seismologists were puzzled that the signals started with
small waves, gained in size to a peak, and lasted for unbelievably long
periods of time.  'The records are utterly different from any obtainable
observations on the Earth,' relates one scientist in the highly regarded
publication 'Science' (November 12, 1971." 
  "The seismic records of Apollo 12 proved not to be unique.  When the
spent 3rd stage of the ill-fated Saturn rocket booster of Apollo 13 was
propelled out of Earth orbit into a Moon trajectory, and by radio
command crashed into the Moon, it hit with an impact equal to 11 tons of
TNT, about 87 miles from the site where the Apollo 12 astronauts set up
seismometers." 
  "The entire Moon vibrated for more than 3 hours, 20 minutes; the
vibrations traveling to a depth of 22-25 miles." 
  "The Apollo 14's S-IVB was also boosted into a Moon course and, by
remote control, crashed into the lunar surface.  


A NASA science publication ('Apollo 
14:  Science at Fra Mauro, p.17') said:  'The Moon reacted like a gong.
For about 3 hours it vibrated and these vibrations traveled to a depth
of 22-25 miles.' The instruments, by the way, picked up the vibrations
even though they were 108 miles away from the Apollo 14 imapct site."
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