QUITO: A powerful, 7.8-magnitude earthquake shook Ecuador's central coast on Saturday, killing at least 41 people and spreading panic hundreds of kilometers (miles) away as it collapsed homes and buckled a major overpass.

The US Geological Survey said the shallow quake, the strongest since 1979 to hit Ecuador, was centered 27 kilometers (16 miles) south-southeast of Muisne, a sparsely populated area of fishing ports that's popular with tourists.

Vice President Jorge Glas said in a televised address that there were initial reports of 41 dead in the cities of Manta, Portoviejo and Guayaquil — all several hundred kilometers (miles) from where the quake struck shortly after nightfall. He said the death toll is likely to rise as reports from the worst-hit areas come in.

Among those killed was the driver of a car crushed by an overpass that buckled in Guayaquil, the country's most populous city.

On social media residents shared photos of homes collapsed, the roof of a shopping center coming apart and supermarket shelves shaking violently. In Manta, the airport was closed after the control tower collapsed, injuring an air force official. Hydroelectric dams and oil pipelines in the OPEC-member nation were shut down as a precautionary measure.

President Rafael Correa, who is in Rome after attending a Vatican conference Friday, called on Ecuadoreans to stay strong while authorities monitor events.

He said on Twitter he had signed a decree declaring a national emergency but that the earliest he could get back to Ecuador is Sunday afternoon. He said that there were "dozens of dead" from the earthquake.

The Pacific Tsunami Warning Center said hazardous tsunami waves are possible for some coasts. While the government hadn't issued a tsunami alert, Glas urged residents along the coast to move to higher ground and towns near the epicenter were also being evacuated as a precautionary measure. An emergency had been declared in six of Ecuador's 24 provinces, while sporting events and concerts were cancelled until further notice nationwide.

"It's very important that Ecuadoreans remain calm during this emergency," Glas said from Ecuador's national crisis room.

The quake was felt across the border in Colombia, where it shook residents in Cali and Popayan, and Peru briefly issued a tsunami.

In the capital Quito hundreds of kilometers away, the quake was felt for about 40 seconds and people fled to the streets in fear. The quake knocked out electricity in several neighborhoods and six homes collapsed but the situation under control and power being restored, Quito's Mayor Mauricio Rodas said.

"I'm in a state of panic," said Zoila Villena, one of many Quito residents who congregated in the streets. "My building moved a lot and things fell to the floor. Lots of neighbors were screaming and kids crying."

The USGS originally put the quake at a magnitude of 7.4 then raised it to 7.8. It had a depth of 19 kilometers. At least 36 aftershocks followed, one as strong as 6 on the Richter scale, and authorities urged residents to brace for even stronger ones in the coming hours and days.

Guayaquil's international airport was also closed because of a lack of communications.

The quake comes on the heels of two deadly earthquakes across the Pacific, in the southernmost of Japan's four main islands. A magnitude-6.5 earthquake struck Thursday near Kumamoto, followed by a magnitude-7.3 earthquake just 28 hours later. The quakes have killed 41 people and injured about 1,500, flattened houses and triggered major landslides.

7.8 quake kills 28, causes 'considerable damage' in Ecuador

QUITO: At least 28 people died in Ecuador when a 7.8 magnitude earthquake struck off the country's northwest Pacific coast late on Saturday, causing "considerable damage" near the epicenter as well as in the largest city of Guayaquil.

The Andean nation's government recommended residents leave coastal areas over concern for rising tides following the quake.

Alarmed residents streamed into the streets of the capital Quito, hundreds of kilometers (miles) away, and other towns across the nation.

"Based on preliminary information, there are 16 people dead in the city of Portoviejo, 10 in Manta and two in the province of Guayas," said Vice President Jorge Glas in a televised address. "We continue to receive information."

The country's Geophysics Institute in a bulletin described "considerable damage" in the area of the epicenter and in Guayaquil, without providing further details.

It said the quake struck at around 8:00 p.m. (0100 GMT) at a depth of 20 km (12.4 miles).

Social media pictures showed a collapsed bridge in Guayaquil and a collapsed tower at an airport in the city of Manta.

"I was in my house watching a movie and everything started to shake. I ran out into the street and now I don't know what's going to happen," said Lorena Cazares, 36, a telecommunications worker in Quito.

Parts of the capital were without power or telephone service, with many communicating only via Whatsapp. Photos on social media showed cracks in the walls of shopping centers.

The capital's municipal government later said power had been restored and there were no reports of casualties in the city.

The Pacific Tsunami Warning Center said tsunami waves reaching 0.3 to 1 meter (one to three feet) above tide level were possible for some coastal areas of Ecuador.

Neighboring Peru issued a tsunami alert for the north of the country following the quake.

Across the Pacific in Japan, a 7.3 magnitude tremor struck Kumamoto province early Saturday, killing at least 32 people, injuring about a thousand and causing widespread damage, in

the second major quake to hit the island of Kyushu in just over 24 hours. The first, late on Thursday, killed nine.