LRO see Apollo 14 booster impact site

[LunaSea]

This is what thirty-thousand pounds of spacecraft hitting the moon at a little over 5000 mph. looks like.



-- A distinctive crater about 35 meters (115 feet) in diameter was formed when the Apollo 14 Saturn IVB (upper stage) was intentionally impacted into the moon. The energy of the impact created small tremors that were measured by the seismometer placed on the Moon by Apollo 12 astronauts in 1969.
http://www.physorg.com/news174243238.html

Here's what the S4B stage looks like-

[DJ13]

1. And, if I remember correctly, the moon rang like a hollow bell on impact

[Wilms]

2. You have. From the OP Link...

A seismometer placed in 1969 by Apollo 12 astronauts recorded the vibrations, which lasted for about three hours.

http://www.physorg.com/news174243238.html