SKYWALKER, EXPLOSION - BIG CRUNCH

These're Skywalker Sound sound effects consisting of 2 medium explosions. They debuted in Star Wars: Episode V - The Empire Strikes Back (1980) and were recorded by either Ben Burtt and/or Randy Thom.

TV Series

 * Star Wars: The Clone Wars (Heard once in "Storm over Ryltoh". Both takes heard in "Children of the Force" as a Mustafar facility's floor begins to split)
 * The Young Indiana Jones Chronicles

Movies

 * Cloverfield (2008)
 * F/X 2 (1991) (Includes and introduced the sound in various pitches / processing)
 * The Incredibles (2004) (Heard once in a low volume)
 * Lorelei: The Witch of the Pacific Ocean (2005)
 * Mars Attacks! (1996)
 * Star Wars: Episode V - The Empire Strikes Back (1980) (debut)
 * Star Wars: Episode VI - Return of the Jedi (1983)
 * Star Wars: Episode VIII - The Last Jedi (2017)
 * Terminator 2: Judgment Day (1991)
 * Young Indiana Jones and the Treasure of the Peacock's Eye (1995) (Heard once in a high pitch)
 * Volcano (1997)

Video Games

 * Star Wars: Battlefront (2004)

Audio Samples
"Clone Wars: Children of the Force" and the shot referenced with "Lorelei" are good sources for sampling the sounds.