Colombo, Sri Lanka ? Legions of rescuers spread across Asia today after an earthquake of epic power struck deep beneath the Indian Ocean, unleashing 20-foot tidal waves that ravaged coasts across thousands of miles and killed more than 13,340 people and left millions homeless in the fourth-largest temblor in a century.

The death toll along the southern coast of Asia — and as far west as Somalia, on the African coast, where nine people were reported lost — steadily increased as authorities sorted out a far-flung disaster caused by Sunday’s 9.0-magnitude earthquake, the strongest in 40 years.

Signs of the carnage were everywhere: Dozens of bodies still clad in swimming trunks lined beaches in Thailand. Villagers in Indonesia picked through the debris of destroyed houses amid the smell of rotting corpses. Hundreds of prisoners escaped a coastal jail in Sri Lanka.

More than 1 million people were driven from their homes in Indonesia alone, and rescuers there today combed seaside villages for survivors. The Indian air force used helicopters to rush food and medicine to stricken seashore areas.

Another million were driven from their homes in Sri Lanka where some 25,000 soldiers and 10 air force helicopters were deployed in relief and rescue efforts, authorities said.

At Thailand’s beach resorts, packed with Europeans fleeing the winter cold at the peak of the holiday season, families and friends had tearful reunions today after a day of fear that their loved ones had been swept away.

Katri Seppanen, 27, of Helsinki, Finland, walked around barefoot, in her salt water-stained T-shirt and skirt, at the Patong Hospital waiting room where she spent the night with her mother and sister. She had a bandaged cut on her leg.

“The water went back, back, back, so far away, and everyone wondered what it was — a full moon or what? Then we saw the wave come, and we ran,” said a tearful Seppanen, who was on the popular Patong beach with her family. The wave washed over their heads and separated them.

Unprecedented damage

An unidentified woman cries after tidal waves destroyed her house in Colombo, Sri Lanka. The most powerful earthquake in 40 years Sunday triggered massive tidal waves that slammed coastlines across Asia. The U.S. Geological Survey said the 9.0-magnitude earthquake in Indonesia was the largest in the world since a 9.2 temblor hit Alaska in 1964.

The earthquake hit at 6:58 a.m. (10:58 p.m. Saturday CST); the tsunami came as much as 2 1/2 hours later, without warning, on a morning of crystal blue skies. Sunbathers and snorkelers, cars and cottages, fishing boats and even a lighthouse were swept away.

Indonesia, Sri Lanka and India each reported thousands dead. Deaths also were reported in Malaysia, Maldives and Bangladesh.

“It’s an extraordinary calamity of such colossal proportions that the damage has been unprecedented,” said Chief Minister Jayaram Jayalalithaa of India’s Tamil Nadu, a southern state which reported 1,705 dead, many of them strewn along beaches, virtual open-air mortuaries.

“It all seems to have happened in the space of 20 minutes. A massive tidal wave of extreme ferocity … smashed everything in sight to smithereens,” she said.

At least three Americans were among the dead — two in Sri Lanka and one in Thailand, according to State Department spokesman Noel Clay. He said a number of other Americans were injured, but he had no details.

“We’re working on ways to help. The United States will be very responsive,” Clay said.

John Krueger, 34, of Winter Park, Colorado, described being inside his bungalow Sunday on Khao Luk Beach, north of Phuket, with his wife, Romina Canton, 26, of Rosario, Argentina, when the water filled it and blew it apart.

A street is littered with damaged vehicles and debris after the area was hit by tidal waves at Patong beach in Phuket, Thailand.

“The water rushed under the bungalow, brought our floor up and raised us to the ceiling. The water blew out our doors, our windows and the back concrete wall. My wife was swept away with the wall, and I had to bust my way through the roof,” Krueger said while waiting to talk to a U.S. Embassy official at Phuket City Hall. “It was like being in a washing machine.”

Canton was dragged into the ocean for more than an hour until a wave brought her back to land again, with a broken nose and foot scratches all over her body, Krueger said.

The quake was centered 155 miles south-southeast of Banda Aceh, the capital of Indonesia’s Aceh province on Sumatra, and six miles under the Indian Ocean’s seabed. The temblor leveled dozens of buildings on Sumatra — and was followed Sunday by at least a half-dozen powerful aftershocks, ranging in magnitude from almost 6 to 7.3, and one aftershock today that hit India’s Andaman and Nicobar Islands.

Waves were deadlier

The waves that followed the first massive jolt were far more lethal.

An Associated Press reporter in Aceh province saw bodies wedged in trees as the waters receded. More bodies littered the beaches. Authorities said at least 4,448 were dead in Indonesia; the full impact of the disaster was not known, as communications were cut to the towns most affected.

The waves barreled across the Bay of Bengal, pummeling Sri Lanka, where more than 4,500 were reported killed — at least 3,000 in areas controlled by the government and about 1,500 in regions controlled by rebels, who listed the death toll on their Web site. There was an unconfirmed report of 500 more deaths on another Web site that provided no details. Some 170 children were feared lost in an orphanage.

Devinda R. Subasinghe, the Sri Lanka ambassador to the United States, said the extensive damage would make the rescue effort more difficult. “It’s going to take time to figure out access to these areas that have been impacted,” Subasinghe said today in an interview on CNN. Up to 70 percent of the island’s coastline was damaged, he said.

There was sporadic, small-scale looting in the towns of Galle and Matara, and authorities said about 200 inmates escaped from a prison, taking advantage of the chaos after guards panicked and fled when water entered the building.

About 2,300 were reported dead along the southern coasts of India. The private Aaj Tak television channel put the death toll there at up to 3,300, but the report could not be confirmed. At least 431 in Thailand, 48 in Malaysia and 32 in the Maldives, a string of coral islands off the southwestern coast of India. At least two died in Bangladesh — children who drowned as a boat with about 15 tourists capsized in high waves.

In India’s Andhra Pradesh state, at least 32 Hindu devotees were drowned when they went into the sea for a religious ceremony to mark the full moon. Among them were 15 children. Today, bodies of women and children lay strewn on the sand.

“I was shocked to see innumerable fishing boats flying on the shoulder of the waves, going back and forth into the sea, as if made of paper,” said P. Ramanamurthy, 40, of that state.

In Cuddalore, in the worst-hit Tamil Nadu state, survivors huddled Monday in a marriage hall turned makeshift shelter, as fire engine sirens whined outside. Broken boats law on the shore near smashed huts with only frail bamboo frames jutting out of the ground.

The earthquake that caused the tsunami was the largest since a 9.2 temblor hit Prince William Sound in Alaska in 1964, according to geophysicist Julie Martinez of the U.S. Geological Survey.

“All the planet is vibrating” from the quake, said Enzo Boschi, the head of Italy’s National Geophysics Institute. Speaking on SKY TG24 TV, Boschi said the quake even disturbed the Earth’s rotation.

The quake occurred at a place where several huge geological plates push against each other with massive force. The survey said a 620-mile section along the boundary of the plates shifted, motion that triggered the sudden displacement of a huge volume of water.