By Gul Yousafzai

QUETTA, Pakistan, Oct 30 (Reuters) - Pakistani army helicopters scoured mountains on Thursday for survivors of a powerful earthquake that struck the previous day killing more than 200 people.

The 6.4 magnitude quake struck the Ziarat valley in the southwestern province of Baluchistan at dawn on Wednesday, levelling about 1,500 mud-walled houses, triggering landslides and leaving nearly 15,000 homeless. Efforts shifted from rescue to relief as hundreds of injured people were shifted to hospitals. But a senior army official said searches were being conducted in the mountains above the valley for any stranded villagers.

"Along with the relief operation, we're still looking for survivors and our helicopters are still flying," said Major-General Saleem Nawaz, commander of the paramilitary Frontier Corps in the province.

The quake struck just over three years after 73,000 people were killed when a 7.6 magnitude quake hit Pakistan's northern mountains. Last year, the worst floods on record in Baluchistan killed hundreds.

The epicentre of Wednesday's quake was in Ziarat district, a picturesque valley and one of the province's main tourist spots.

Administration officials said the death toll was more than 200 while 500 people were injured.

About 20 aftershocks on Wednesday, the biggest of 6.2 magnitude, caused more damage and kept jittery residents outdoors as night temperatures fell to below freezing.

The quake triggered landslides that destroyed some houses and blocked roads, complicating search and relief operations.

"DISAPPOINTING"

A national disaster management team said it had sent rescue workers, tents, blankets and clothing but officials said only a trickle of help was getting through.

"Only one truck of tents and blankets has reached the affected areas as we were told that helicopters could not land because of the aftershocks," said Ziarat district chief Dilawar Khan.

"It's very disappointing, we are badly in need of tents. It's extremely cold out in the open."

The International Committee of the Red Cross (ICRC) sent two teams to the area. "Aftershocks have continued which we think will force the population to stay outside, and the weather is cold," said ICRC spokeswoman Carla Haddad on Wednesday.

The World Health Organisation said it was sending two truckloads of essential medicines and supplies for 50,000 people for three months to Ziarat and Pishin, a neighbouring district where at least five people were killed.

In 1935, about 30,000 people were killed and the provincial capital, Quetta, was largely destroyed by a severe earthquake.

Baluchistan is Pakistan's largest province but its most thinly populated. It has the country's biggest reserves of natural gas but there were no reports of damage to gas facilities. ( Writing Augustine Anthony; Editing by Robert Birsel)

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