Found this:
Quote:
Mission to a Comet | NASA
https://www.nasa.gov › mission_pages › deepimpact › mission › index.html
Deep Impact, a NASA Discovery Mission, is the first space mission to probe beneath the surface of a comet and reveal the secrets of its interior. Artist's concept of Deep Impact. On July 4, 2005, the Deep Impact spacecraft arrives at Comet Tempel 1 to impact it with a 370-kg (~820-lbs) mass.
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They didn't have a seismic reading from that*, but we know that the Moon rings like a bell.
(Also, the S0 reports there was an upward lightning bolt at the La Palma volcano)
*The visible white electrical flash was [mis]attributed to "talcum powder' dust. Dust, the thing they think is 'Dark Matter' out beyond the Oort Cloud.