>>>> What are lahar routes?
>>>> Judith Barnett
>>>
>>> The mud flows coming off Mt. Rainier
>>
>> Tacoma is built on historic/prehistoric lahara around 10-30 yards thick.
>
> Thanks for the info, I had never heard that term before.
> Judith Barnett
Some of these are described as having the consistency of freshly mixed wet concrete. Here's part of the Wikipedia description:
> Lahars vary in size and speed. Small lahars less than a few meters wide and several centimeters deep may flow a few meters per second. Large lahars hundreds of meters wide and tens of meters deep can flow several tens of meters per second: much too fast for people to outrun. With the potential to flow at speeds up to 100 kilometres per hour (60 mph), and distances of more than 300 kilometres (190 mi), a lahar can cause catastrophic destruction in its path. Lahars from the 1985 Nevado del Ruiz eruption in Colombia caused the Armero tragedy, which killed an estimated 23,000 people, when the city of Armerowas buried under 5 metres (16 ft) of mud and debris. A lahar caused New Zealand's Tangiwai disaster, where 151 people died after a Christmas Eve express train fell into the Whangaehu River. Lahars have been responsible for 17% of volcano-related deaths between 1783 and 1997.
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Jim Saklad mailto:jimdoc@me.com
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