When a strong earthquake occurs underwater, it changes the level of the seabed and causes the water level to either rise or fall. []))) For example, submarine flow failures carried away large sections of port facilities at Seward, Whittier, and Valdez, Alaska, during the 1964 Prince William Sound earthquake. The great distance between wave crests prevents tsunamis from dissipating energy as a breaking surf; instead, tsunamis cause water levels to rise rapidly along coast lines.Tsunamis and earthquake ground shaking differ in their destructive characteristics. Damage to these types of structures has ranged from minor to very severe. If the forces are released in frequent intervals the damages will be less .Some times no damage at all.But if by any chance if the place even though prone to earthquakes and not experienced any earthquake for a long time the attacking earthquake will be very big. A variety of structures have been damaged by surface faulting, including houses, apartments, commercial buildings, nursing homes, railroads, highways, tunnels, bridges, canals, storm drains, water wells, and water, gas, and sewer lines. Inundation happens when a large amount of water goes inland in a short period of time, flooding coastal areas. Buildings and other structures sometimes even collapse, because the foundation cannot handle the force of the shaking ground. It is difficult to separate earthquakes and provide accurate warnings when multiple earthquakes occur almost simultaneously or in close proximity to each other. Flow failures, consisting of liquefied soil or blocks of intact material riding on a layer of liquefied soil, are the most catastrophic type of ground failure caused by liquefaction. Places like California, where earthquakes constantly occur, have buildings and structures designed to survive earthquakes. Thousands of small earthquakes occur almost all the time; however, most of these occurrences are too weak to be felt by humans. The Richter scale measures the magnitude of an earthquake (how powerful it is). Breaks of water mains hampered efforts to fight the fire that ignited during the earthquake. if there are disadvantages there has to be advantages. People often experience emotional side effects of this natural hazard. So it is part of shaping the Earth. The failures at Seward, Alaska, during the 1964 earthquake are an example.The size of the area affected by earthquake-induced landslides depends on the magnitude of the earthquake, its focal depth, the topography and geologic conditions near the causative fault, and the amplitude, frequency composition, and duration of ground shaking. They are the most damaging waves, because buildings are more easily damaged from horizontal motion than from vertical motion. During that event, several four-story buildings of the Kwangishicho apartment complex tipped as much as 60 degrees. In 1906, a number of major pipeline breaks occurred in the city of San Francisco during the earthquake because of lateral spreading. Reactivation of dormant slumps or block slides by earthquakes is rare.Large earthquake-induced rock avalanches, soil avalanches, and underwater landslides can be very destructive.
This process is automatic. Changes in geologic features Lateral spreads generally develop on gentle slopes, most commonly on those between 0.3 and 3 degrees.
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