Rogue Wave In Cali Injure Spectators
As the waves get closer to shore, they decrease in speed and increase in height. They approach the coastline as a series of high and low water levels, approximately 10-45 minutes apart, with their speed decreasing to about 30-40 mi/hr (50-60 km/hr). The depth of the water and the layout of the coastal area can affect the tsunami's configuration when it hits the shore. It can grow to 30-50 meters high and smash into the shore as a wall of water or sweep over the land as a fast-moving flood. Although tsunamis can happen in any large body of water, most occur in the Pacific Ocean.
A tsunami that is generated from close-by can reach the shore in less than ten minutes. This does not allow authorities time to issue a warning. The only warning might be movement in the ground, which could alert people close to the shore that a tsunami is imminent. If a major earthquake gives cause to suspect a tsunami, one of the following warnings may be issued:
- Tsunami information bulletin - announcing that a threat exists.
- Tsunami watch - announcing that the tsunami is likely and residents should be alert.
- Tsunami warning - giving expected arrival times of a tsunami.
- Video Footage of Rogue Wave
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Areas at greatest risk are usually within one mile (1.6 km) of the shoreline and less than 25 feet (7.6 meters) above sea level. Since the tsunami arrives as a series of waves, the danger exists even after the first wave hits. Often, subsequent waves may be more dangerous than the first one. The force of the tsunami is enormous, with waves carrying huge boulders, trees, buildings and vehicles in its wake. It can wrap around an island and be just as dangerous on the far side of the island as on the side facing the source of the tsunami.
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