an inactive earthquake
An earthquake is a result of movement along a fault line, so they aren't classified as extinct and dormant. If you mean volcanoes, an extinct volcano is one that scientists classify as unlikely to erupt again because it no longer has lava supply. A dormant volcano is one scientists believe can still be active but has not had an eruption in recent years.
dormant dormant
dormant
Large earthquakes are not caused by volcanic activity - it can be the other way around, when nearby earthquakes trigger eruptions by destabilizing the magma structures.
The word dormant is an adjective. Dormant means to be inactive or asleep.
dormant
dormant
Dormant
It is a dormant volcano
"dormant / en dormant"
Its dormant
dormant