We calculate the actual speed of the tsunami by measuring the water depth at a point in time when the tsunami passes by. A tsunami's ability to maintain speed is directly influenced by the depth of the water. A tsunami moves faster in deeper water and slower in shallower water. So unlike a normal wave, the driving energy of a tsunami moves through the water as opposed to on top of it. Therefore, as a tsunami moves though deep water at hundreds of miles an hour, it is barely noticeable above the waterline. A tsunami is typically no more than 3 feet (1 meter) high until it gets close to shore. Once a tsunami gets close to shore, it takes its more recognizable and deadly form.
Adult head lice can live for approximately 24 hours away from a host, according to the Centers for Disease Control. Nymphs, or young head lice, can live for only several hours away from a host. Lice eggs are less dependent on a host, and they can live for up to one week without a host. Continue Reading.
Head lice are very sturdy creatures and can survive. many days off of people in furniture, linens or. clothing. Head lice need a blood meal every few hours and. the warmth of the human scalp to survive. When. off the human body, they cannot survive for more. than 24 to 36 hours. Nits (lice eggs) can fall off a personâs head, hatch. and cause another person to get lice. Nits are glued to the hair shaft by a cement-like.