Answer: tsunamis

AnswerCrossword Clue
TSUNAMIS

Waves to fear

TSUNAMIS

Scary waves

TSUNAMIS

Seismic sea waves

TSUNAMIS
Fast-moving waves
TSUNAMIS
Big waves
TSUNAMISDevastating waves
TSUNAMISBig waves miss tuna at sea (8)
TSUNAMISCap is worn by star for big waves (8)
TSUNAMISWaves with long wavelengths?
TSUNAMISRing of Fire perils
TSUNAMISGreat swells
TSUNAMISHuge waves
TSUNAMISTidal waves
TSUNAMISRing of Fire dangers