A large avalanche occurred on Monday night, with a mixture of ice, rock, snow and water, but did not reach the valley floor.
The front of the glacier is now advancing at a rate of 10 metres a day, according to the Lötschental regional command headquarters in its latest update on Tuesday.
A massive cone of debris had formed on the Birch glacier in recent days. Around nine million tonnes of debris are weighing down on the glacier.
A new reconnaissance flight is scheduled for Tuesday, and a second camera is to be installed to provide an oblique view of the glacier. This will enable a more detailed assessment of the movements and appearance of the crevasses on the front of the glacier. A further reconnaissance flight is also planned.
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Nine million kilograms of rubble lie on Birch Glacier
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The Birch Glacier above Blatten in the Lötschental valley, canton Valais, is causing the most concern among experts.
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