OZU, Japan -- The wooden home barely withstood the first earthquake. An even stronger one the next night dealt what might have been the final blow -- if not to the house, then to the Tanaka family's peace of mind.

The Tanakas joined about 50 other residents of the southern Japanese town of Ozu who were planning to sleep in their cars at a public park after two nights of increasingly terrifying earthquakes that have killed 41 people and injured about 1,500, flattened houses and triggered major landslides.

"I don't think we can go back there. Our life is in limbo," said 62-year-old Yoshiaki Tanaka, as other evacuees served rice balls for dinner. He, his wife and his 85-year-old mother fled their home after a magnitude-7.3 earthquake struck Saturday at 1:25 a.m., just 28 hours after a magnitude-6.5 quake hit the same area.

Search efforts resumed Sunday morning for about half-a-dozen missing people in debris-strewn communities in a mountainous area near Mount Aso, the largest active volcano in Japan.

Prime Minister Shinzo Abe said that the Defence Ministry is co-ordinating with the U.S. military in Japan to add U.S. aircraft to the search and recovery effort.

Landslides from Saturday's earthquake have blocked roads and destroyed bridges, making it difficult to access the area east of Kumamoto, a city of 740,000 on the southwestern island of Kyushu.

Overnight rainfall did not appear to cause any more landslides, as had been feared, and the skies had cleared by morning.

About 80,000 homes in Kumamoto prefecture still didn't have electricity Sunday, the Ministry of Economy, Trade and Industry said. Japanese media reported that an estimated 400,000 households were without running water.

Kumamoto prefectural official Riho Tajima said that more than 200 houses and other buildings had been either destroyed or damaged, and that 91,000 people had evacuated from their homes.

Hundreds of people lined up for rations at distribution points before nightfall, bracing for the rain and strong winds that were expected. Local stores quickly ran out of stock and shuttered their doors, and people said they were worried about running out of food.

Police in Kumamoto prefecture said that at least 32 people had died from Saturday morning's earthquake. Nine died in the quake on Thursday night.

More than half the deaths were in Mashiki, a town on the eastern border of Kumamoto city that was hit hardest by the first quake.

Japan's Kyodo news agency reported that four people were missing in Minamiaso, a more rural area farther east of Kumamoto where the landslides were triggered by the second quake.

One landslide tore open a mountainside in Minamiaso from the top to a highway below. Another gnawed at a highway, above a smashed house that had fallen down a ravine. In another part of the village, houses were hanging precariously at the edge of a huge hole cut open in the earth.

About 1,500 people were injured in the two earthquakes, said Yoshihide Suga, the Japanese government's top spokesman. He said the number of troops in the area was being raised to 20,000, while additional police and firefighters were also on the way.

In Mashiki, where people were trapped beneath the rubble for hours, an unconscious 93-year-old woman, Yumiko Yamauchi, was dragged out from the debris of her home Saturday and taken by ambulance to a hospital. Her son-in-law Tatsuhiko Sakata said she had refused to move to shelter with him after the first quake Thursday.

"When I came to see her last night, I was asking her: 'Mother? I'm here! Do you remember me? Do you remember my face?' She replied with a huge smile filled with joy. A kind of smile that I would never forget. And that was the last I saw of her," Sakata said.

Japanese TV showed a collapsed student dormitory at Aso city's Tokai University that was originally two floors, but now looked like a single-story building. A witness said he heard a cry for help from the rubble. Two students were reported to have died there.

The area has been rocked by aftershocks. The Japan Meteorological Agency said the magnitude-7.3 quake early Saturday may have been the main one, with the one from Thursday night a precursor.

Tanaka, the man spending the night in his car with others in Ozu, had spent Friday starting to clean up the mess from the first earthquake, hoping the aftershocks would gradually subside.

"Then came the big one, which was so powerful I couldn't even stand on my feet. It was horrifying," he said, adding that when he left, his house was tilted at an angle.

David Rothery, professor of planetary geosciences at The Open University in Britain, said Saturday's quake was 30 times more powerful than the one Thursday.

"It is unusual but not unprecedented for a larger and more damaging earthquake to follow what was taken to be the main event," he said.

Rothery noted that in March 2011, a magnitude-7.2 earthquake in northern Japan was followed two days later by the magnitude-9.0 quake that caused a devastating tsunami that killed more than 18,000 people.

Mount Aso, near the village of Minamiaso, erupted Saturday for the first time in a month, sending smoke rising about 100 metres (328 feet) into the air, but no damage was reported. It was not clear whether there was a link between the quakes and the eruption. The 1,592-meter (5,223-foot) -high mountain is about a 90-miniute drive from the epicenter.

The second earthquake seriously damaged historic Aso Shrine, a picturesque complex near the volcano. A number of buildings with curved tiled roofs were flattened on the ground like lopsided fans. A towering gate, known as the "cherry blossom gate," collapsed.