The speed of rock slippage has tripled since the 84 residents were taken to safety on May 9, it was announced on Sunday.
With the mountain shrouded in mists, it has been difficult to gauge the rockslide with much accuracy over the last week.
This has prevented residents from returning to their homes to pick up possessions.
But the local authorities in the southwestern canton of Graubünden now say the rock movement has accelerated.
In the worst-case scenario, several large rocks could tumble down the mountain reaching speeds of up to 200 km/per hour, according to Simon Löw, a geology professor at the federal technology institute ETH Zurich.
This scenario has the potential to destroy the village, Löw said.
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Swiss village is evacuated under rockslide threat
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The Swiss village of Brienz/Brinzauls, which sits beneath an unstable mountain, is devoid of people and animals and is on red alert.
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