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Lahars move rapidly down valleys like rivers of concrete. If you are on the floor of a valley that leads from a volcano and become aware of an oncoming lahar, seek high ground. Lahar is an Indonesian term that describes a hot or cold mixture of water and rock fragments that flows down the slopes of a volcano and typically enters a river valley.
Tiger sharks have a maximum speed of about 32 km per hour, which equates to around 20 miles per hour. It's alot faster than 1 mph, a human swims 2-5 mph average.   It depends on what kind of shar â¦ k, but the mako can get up to 45-50  mph in short bursts. When a shark is hitting prey from underneath  they can reach up to 30mph. 12 people found this useful. Answered.