Some 10,000 troops and 3,500 police are being deployed in the affected areas, as rescue operations continue.
The magnitude-7.8 quake struck on Saturday evening.
Coastal areas in the north-west were closest to the epicentre and officials say the death toll is likely to rise as information begins to come in.
Ecuador's President Rafael Correa has cut short a visit to Italy to deal with the crisis.
He has declared a state of emergency and said the priority is finding survivors.
(BBC News)