Assertion: earthquake | /r/AtLocation | volcanic regions
Facets:
value: often
type: TEMPORAL
Source sentences:
text: Earthquakes often occur in volcanic regions and are caused there, both by tectonic faults and the movement of magma in volcanoes.
text: Earthquakes may also occur in volcanic regions and are caused there both by tectonic faults and by the movement of magma in volcanoes.