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.
But, it's equally important to make sure that they're removed from your home, too. Following are tips that can be followed at home to help remove lice from your environment. Lice can survive up to 26 hours off the head. Lice eggs, or nits, do not hatch off the head except in extremely rare conditions. Treating head lice with heat. The first line of defense is to wash linens, pillowcases, hats and clothes in very hot water that is at least 150F/66C for no less than 10 minutes. This is usually accomplished by washing these items in hot water and drying with high heat.