Enter a clue or pattern or both:
The Clue
Seismologist's concern (10 letter answer)
The Answer
EARTHQUAKE
Tags
Notes
The answer EARTHQUAKE is rarely seen, appearing only about once every 2100 puzzles.
Related Clues
Californian's worry
Catastrophic event
Natural disaster
Richter-scale event
S.F. headline of 1906
Definition
EARTHQUAKE as a noun:
1. (earthquake, quake, temblor, seism) = shaking and vibration at the surface of the earth resulting from underground movement along a fault plane of from volcanic activity
2. a disturbance that is extremely disruptive; "selling the company caused an earthquake among the employees"