Not all avalanches are created by a loud noise, like most people think. The really big avalaches, or the "Big Guys in White Suits", are made by simply the weight of your body coming in contact with a "soft spot" in the snow that has been there a very long time. In other words, when you step on an area in the snow that has particularly weak layers then you're bound to start an avalanche.
If you are still wondering how some avalanches get started by a loud noise then I'll be happy to explain. To better explain this, I'll use an example. Have you ever walked in the snow? If so you know that when you put your foot in the snow it leaves a pretty prominent footprint. This shows that snow isn't very compacted or very loosely together. So, as I can imagine, having such an unstable collection of snow in an area could, in fact, be caused to roll down the mountain if a vibration, such as a loud sound, contacted with it.
There are also soooo many different types of avalanches that ,sometimes, it's hard to figure out how it started.
Information from:http://www.avalanche.org/~uac/encyclopedia/avalanche.htm
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Well paige i have some intresting things for you! Did you know that an avalanche can start if there is a loud nose or get this a big sneeze? I get very scared because of them i hope we are never in that situation!
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