A five-letter word for sudden movement is probably "start." Make sure the "d" is correct.
dramatic
A yawp (or yaup) is a sudden yelp or bark.
A flash flood?
boom
Earthquake
That's called an earthquake.
The sudden movement of the earth's crust is called and earthquake
Sounds suspiciously like an earthquake. Indeed, it is.
the sudden movement of rocks and soil down a hill is a
a jerk
Lurch can be a noun and a verb. Noun: A sudden or unsteady movement. Verb: To make a sudden or unsteady movement.
A shift in the earth's crust to relieve pressure, and therefore release energy, is an earthquake.
earthquakes
earthquake/fissure
brunnett beauty: What is ground movement? I believe ground movement is the plates moving in the earth just like how earthquakes form by plates in the ground colide to make movement in the earth.
sudden shaking of the ground