Find content
Male
lopburi3, on 2012-04-11 17:26:37, said:
webfact, on 2012-04-11 17:21:15, said:
RT @phuketgazette: TSUNAMI ALERT UPDATE: Phuket Gazette receives eyewitness reports that the coastal waters off Patong and Nai Harn beaches have not receded
Posts I've Made
In Topic: Tsunami Warning Issued For Thai Coastal Provinces Following 8.9-Scale Quake I...
2012-04-11 17:26:08
PaulBax, on 2012-04-11 17:23:16, said:
craigt3365, on 2012-04-11 17:17:26, said:
Nation is reporting water receding in Krabi.
the tide is going out low tide is at 19.30
In Topic: Tsunami Warning Issued For Thai Coastal Provinces Following 8.9-Scale Quake I...
2012-04-11 17:24:10
wellred, on 2012-04-11 17:23:07, said:
What can we gauge from the water receding? Does that guarantee that a tsunami will hit, of what magnitude?
In Topic: Tsunami Warning Issued For Thai Coastal Provinces Following 8.9-Scale Quake I...
2012-04-11 17:19:44
wellred, on 2012-04-11 17:14:26, said:
Woody Leonhard @PhuketPC
Reports of receding water in Patong Bay are false. I'm looking at it right now
Reports of receding water in Patong Bay are false. I'm looking at it right now
In Topic: Tsunami Warning Issued For Thai Coastal Provinces Following 8.9-Scale Quake I...
2012-04-11 17:14:12
SOTIRIOS, on 2012-04-11 17:10:03, said:
.....I don't see anything to joke about.....to each his own.........40 cm.....1000 km away......
As the tsunami crosses the deep ocean, its length from crest to crest may be a hundred miles or more, and its height from crest to trough will only be a few feet or less. They can not be felt aboard ships nor can they be seen from the air in the open ocean. In the deepest oceans, the waves will reach speeds exceeding 600 miles per hour (970 km/hr). When the tsunami enters the shoaling water of coastlines in its path, the velocity of its waves diminishes and the wave height increases. It is in these shallow waters that a large tsunami can crest to heights exceeding 100 feet (30 m) and strike with devastating force.
Tsunamis are characterized as shallow-water waves. Shallow-water waves are different from wind-generated waves, the waves many of us have observed on a the beach. Wind-generated waves usually have period (time between two sucessional waves) of five to twenty seconds and a wavelength (distance between two sucessional waves) of about 100 to 200 meters (300 to 600 ft). A tsunami can have a period in the range of ten minutes to two hours and a wavelength in excess of 300 miles (500 km). It is because of their long wavelengths that tsunamis behave as shallow-water waves. A wave is characterized as a shallow-water wave when the ratio between the water depth and its wavelength gets very small. The speed of a shallow-water wave is equal to the square root of the product of the acceleration of gravity (32ft/sec/sec or 980cm/sec/sec) and the depth of the water. The rate at which a wave loses its energy is inversely related to its wavelength. Since a tsunami has a very large wave length, it will lose little energy as it propagates. Hence in very deep water, a tsunami will travel at high speeds and travel great transoceanic distances with limited energy loss. For example, when the ocean is 20,000 feet (6100 m) deep, unnoticed tsunami travel about 550 miles per hour (890 km/hr), the speed of a jet airplane........
...anyone still laughing???
Let's hope that it dissipates....
As the tsunami crosses the deep ocean, its length from crest to crest may be a hundred miles or more, and its height from crest to trough will only be a few feet or less. They can not be felt aboard ships nor can they be seen from the air in the open ocean. In the deepest oceans, the waves will reach speeds exceeding 600 miles per hour (970 km/hr). When the tsunami enters the shoaling water of coastlines in its path, the velocity of its waves diminishes and the wave height increases. It is in these shallow waters that a large tsunami can crest to heights exceeding 100 feet (30 m) and strike with devastating force.
Tsunamis are characterized as shallow-water waves. Shallow-water waves are different from wind-generated waves, the waves many of us have observed on a the beach. Wind-generated waves usually have period (time between two sucessional waves) of five to twenty seconds and a wavelength (distance between two sucessional waves) of about 100 to 200 meters (300 to 600 ft). A tsunami can have a period in the range of ten minutes to two hours and a wavelength in excess of 300 miles (500 km). It is because of their long wavelengths that tsunamis behave as shallow-water waves. A wave is characterized as a shallow-water wave when the ratio between the water depth and its wavelength gets very small. The speed of a shallow-water wave is equal to the square root of the product of the acceleration of gravity (32ft/sec/sec or 980cm/sec/sec) and the depth of the water. The rate at which a wave loses its energy is inversely related to its wavelength. Since a tsunami has a very large wave length, it will lose little energy as it propagates. Hence in very deep water, a tsunami will travel at high speeds and travel great transoceanic distances with limited energy loss. For example, when the ocean is 20,000 feet (6100 m) deep, unnoticed tsunami travel about 550 miles per hour (890 km/hr), the speed of a jet airplane........
...anyone still laughing???
Let's hope that it dissipates....
