Assertion: earthquake | /r/HasProperty | caused
Facets:
value: usually
type: DEGREE
Source sentences:
text: The short answer is that earthquakes are caused by faulting, a sudden lateral or vertical movement of rock along a rupture (break) surface.
text: Earthquakes are caused when faults or cracks in the earth's shell suddenly slip past each other.
text: Earthquakes are usually caused when rock underground suddenly breaks along a fault.
text: Earthquakes are caused when the tension is released from inside the crust.
text: Those who did look for natural causes often reached conclusions that seem fanciful today; one popular theory was that earthquakes were caused by air rushing out of caverns deep in the Earth's interior.