The Collaborative International Dictionary
Icequake
Icequake \Ice"quake`\ ([imac]s"kw[=a]k`), n. The crash or concussion attending the breaking up of masses of ice, -- often due to contraction from extreme cold.
Wiktionary
icequake
n. The concussion that occurs when large masses of ice break up due to contraction.
Usage examples of "icequake".
On the surface these explosions were manifested as sudden icequakes, which reduced the surface ice overhead to a bubbling slurry, the liquid water soon freezing on the surface, but tending to stay liquid underneath.