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Based on what the geologists found, it could be one of two types of landslides. First, it could be a debris flow, which occurs when the ground becomes saturated (from rain), and then mixes with the regolith and other material (example: boulders), and that creates a kind of slurry that moves down slope. Their speeds vary, but
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Earthquakes are another possible trigger. Then another huge factor that encourages landslides is rain. It rains a lot in Oregon, around forty inches a year, but at Machu Picchu it rains around, eighty inches a year. specifically will move faster when on steep terrain and when it’s wet. People walking in this area everyday, is adding to the instability and the chance of a landslide.
There are many options as to how to attempt to stop this landslide. It could be a rockslide because the soil is shallow at Machu Picchu, rain can activate rockslides, there is already a distortion line going through the site, and it is a quickly moving landslide. The number of people per day that are allowed has already been lowered to 500 a day, but less would be better.
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