Sand Blows : Erupting Volcanoes of Sand
Sand blows (also know as sand boils) result from the eruption of water and sand from below ground. During the 1811-1812 earthquakes, sand blows formed over an extremely large area of approximately 10,400 square kilometers.

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Question 1:
Are the size of sand blows related to earthquake magnitude?
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Question 2:
What are sand sills and sand dikes?
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Question 3:
What is the significance of the 2001 Bhuj, India earthquake?
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