By J.R. Wu

TAINAN, Taiwan (Reuters) - Rescuers pulled more survivors from a collapsed apartment tower in Taiwan on Sunday and kept searching for about 120 people still believed trapped in the rubble a day after a strong earthquake shook the island.

Those found alive include a 20-year-old identified by Taiwan media as Huang Kuang-wei and another man in his 20s surnamed Kuo, who was able to walk out of the wreckage, supported by rescuers. Both were sent to hospital.

Firefighters, police, soldiers and volunteers combed through the ruins, some using their hands, watched anxiously by dozens of the victims' family members who wore thick jackets, woollen hats and scarves to combat the winter chill.

Medical staff with empty gurneys waited nearby.

"She's not answering my phone calls ... I am trying to hold my emotions and stay strong. I'll do that until I find her," said a woman surnamed Chang, 42, waiting to hear from her 24-year-old daughter who lived on the fifth floor of the complex.

Another lady, who gave her family name as Li, said she thought a friend she met at a Buddhism class two years ago lived in the collapsed building.

She has her cellphone number but has not called it, Li said.

"I'm afraid to. I'm afraid I'll cry," she told Reuters.

At least 26 people are known to have died in the quake, which struck at about 4 a.m. on Saturday, at the beginning of a Lunar New Year holiday, with most found in the collapsed Wei-guan Golden Dragon Building in the southern city of Tainan.

Around 120 people are still beneath the rubble of the commercial-residential block, with most them trapped deep in the wreckage, the government said.

Bodies continue to be found, including those of two sisters, aged 18 and 23, Taiwanese media reported.

The building's lower floors pancaked on top of each other in the 6.4 magnitude quake and then the whole structure toppled, raising immediate questions about the quality of materials and workmanship used in its construction in the 1990s.

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President Ma Ying-jeou is scheduled to visit the disaster zone on Monday, the first day of the Lunar New Year. Tsai Ing-wen, elected president in elections last month, will also visit Tainan the same day.

QUESTIONS

Tainan Mayor William Lai told reporters about 120 people are believed still missing in the debris, with efforts focusing on some 30 people who are closest to the rescuers and lighter equipment like drills being used.

The extent of damage to the Golden Dragon Building has raised questions.

Liu Shih-chung, Tainan city government deputy secretary general, said television footage of its ruins suggested the possibility of structural problems related to poor-quality reinforced steel and cement.

However, city officials have said it is too early to say for certain if poor construction was a factor in the collapse.

Authorities said the building had 96 apartments and 256 registered residents, though more people were inside when it collapsed.

Rescuers wearing red and yellow overalls have pulled more than 240 survivors from the ruins and inserted huge supports under slabs of leaning concrete as they searched for additional survivors.

Buildings in nine other locations in the city of 2 million people had collapsed and five were left tilting at alarming angles.

(Additional reporting by Yimou Lee, Carol Lee and Pichi Chuang; Writing by Ben Blanchard; Editing by Robert Birsel, Himani Sarkar and Andrew Heavens)