Strong aftershocks rippled through Chile on Thursday after an 8.3-magnitude earthquake that killed at least eight people and slammed powerful waves into coastal towns, forcing more than 1 million people from their homes.

After the powerful quake hit on Wednesday evening, the government ordered evacuations from coastal areas to avoid a repeat of a quake disaster in 2010 when authorities were slow to warn of a tsunami that killed hundreds.

As the risk subsided, the government lifted its tsunami warning on Thursday morning.

The quake and heavy waves afterward caused flooding in coastal towns, damaged buildings and knocked out power in the worst hit areas of central Chile and shook buildings in the capital city of Santiago about 280 kilometers to the south.

The port of Coquimbo suffered major damage in the quake, which was the strongest in the world this year, Interior Minister Jorge Burgos told a news conference.

President Michelle Bachelet said she planned to travel to the areas worst affected by the quake, the biggest to hit the country since 2010.

"It's been awful. We ran out of the house with our grandchildren and now we are on a hill hoping it will be over soon," said Maria Angelica Leiva from the coastal town of Navidad.

"It is all very dark, and we just hope the sea hasn't reached our house," she said.

Tsunami advisories were issued for parts of South America, Hawaii, California and French Polynesia, although waves were generally expected to be small.

As far away as New Zealand, authorities warned of "unusually strong currents" and urged residents in eastern coastal areas to stay out of the water and off beaches.

Dozens of strong aftershocks continued to rattle central Chile, a largely agricultural region south of the mining belt, on Thursday.

A 26-year-old woman was killed by a collapsing wall in ­Illapel, near the quake epicenter. Another person died from a heart attack in Santiago, according to media reports.

Most buildings in Illapel had stayed standing, residents said. Quake-prone Chile has strict building regulations that limit potential damage, so newer buildings are able to withstand even strong quakes.

The brunt of the damage was borne by coastal areas where houses and fishing-boats were smashed by waves. The coastal town of Coquimbo was hit by waves of up to 4.5 meters after the earthquake, Chile's navy said.