Answer: quake

AnswerCrossword Clue
QUAKESeismic occurrence
QUAKETremble, as in fear
QUAKEShiver.
QUAKEShudder.
QUAKEDisaster in Ecuador, Aug. 5, 1949.
QUAKETremble.
QUAKEVibrate.
QUAKETremor.
QUAKETemblor.
QUAKESeismologist's concern
QUAKERichter-scale item
QUAKETragic 1980 event in Italy
QUAKEIt can move mountains
QUAKECereal that lost to Quisp in a 1970s contest
QUAKEFaultfinder's concern?
QUAKECalifornia worry
QUAKEFirst-person shooter of 1996
QUAKEEarth mover?
QUAKE1906 San Francisco event
QUAKEEvent near a fault line
QUAKETremble in fear
QUAKEFrequent occurrence in California
QUAKEGroundswell cause
QUAKEGroundswell causer
quaketo tremble
quaketo shake (to move to and fro with short, rapid movements)
QUAKESeismic event
QUAKESeismic activity
QUAKEImitate aspens
QUAKETemblor
QUAKEEvent in tectonics
QUAKESeismology subject
QUAKETremor
QUAKEShow trepidation
QUAKEEarth mover
QUAKEEarth tremor
QUAKEShow fear
QUAKETremble
QUAKEProduct of a fault
QUAKESeismic jolt