Assume you are in the open ocean and you learn of an earth quake and a possible tsunani. What can you do to protect your life and sailboat? From what I have read, the wave can be as small as two feet in open water and can move as fast as 500 miles per hour, which seems impossible. I think I would head toward the wave to hit it bow on, and pray. I would also get into my survial gear, employ and tow the raft, radio my position every 30 minutes. Beyond that, what can be done? Even if the wave is only two feet and moving at 50 or 100 miles per hour, can a boat survive that type of hit? At a minimum, the keel and rudder will be destroyed. John
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Assume you are in the open ocean and you learn of an earth quake and a possible tsunani. What can you do to protect your life and sailboat? From what I have read, the wave can be as small as two feet in open water and can move as fast as 500 miles per hour, which seems impossible. I think I would head toward the wave to hit it bow on, and pray. I would also get into my survial gear, employ and tow the raft, radio my position every 30 minutes. Beyond that, what can be done? Even if the wave is only two feet and moving at 50 or 100 miles per hour, can a boat survive that type of hit? At a minimum, the keel and rudder will be destroyed. John
John, you were right about going to sea ASAP
and on the ocean, boats don't even know the wave passed. It's a non-event. It's mostly energy that is being transmitted. When the wave reaches shore, well, that's when all hell breaks loose. At least that's the process as I understand it from the media and pundits.
and on the ocean, boats don't even know the wave passed. It's a non-event. It's mostly energy that is being transmitted. When the wave reaches shore, well, that's when all hell breaks loose. At least that's the process as I understand it from the media and pundits.
John, you were right about going to sea ASAP
and on the ocean, boats don't even know the wave passed. It's a non-event. It's mostly energy that is being transmitted. When the wave reaches shore, well, that's when all hell breaks loose. At least that's the process as I understand it from the media and pundits.
and on the ocean, boats don't even know the wave passed. It's a non-event. It's mostly energy that is being transmitted. When the wave reaches shore, well, that's when all hell breaks loose. At least that's the process as I understand it from the media and pundits.
Sail where it's deepest.
If the depth beneath you is more than the wave length of that tsunami, the "wave" would actually be a "swell", which you would hardly notice. As the "wave" approaches a rising sea-bed, as the wave length gets shortened (due to drag along the bottom), its amplitude increases - sometimes (as in this case) substatially! BTW, the wave does indeed travel about 500 mph, at least till it encounters a rising seabed. If you must be on the water during a tsunami, the safest place is over the deepest part of that sea or ocean. ~ Happy sails to you ~ _/) ~
If the depth beneath you is more than the wave length of that tsunami, the "wave" would actually be a "swell", which you would hardly notice. As the "wave" approaches a rising sea-bed, as the wave length gets shortened (due to drag along the bottom), its amplitude increases - sometimes (as in this case) substatially! BTW, the wave does indeed travel about 500 mph, at least till it encounters a rising seabed. If you must be on the water during a tsunami, the safest place is over the deepest part of that sea or ocean. ~ Happy sails to you ~ _/) ~
Sail where it's deepest.
If the depth beneath you is more than the wave length of that tsunami, the "wave" would actually be a "swell", which you would hardly notice. As the "wave" approaches a rising sea-bed, as the wave length gets shortened (due to drag along the bottom), its amplitude increases - sometimes (as in this case) substatially! BTW, the wave does indeed travel about 500 mph, at least till it encounters a rising seabed. If you must be on the water during a tsunami, the safest place is over the deepest part of that sea or ocean. ~ Happy sails to you ~ _/) ~
If the depth beneath you is more than the wave length of that tsunami, the "wave" would actually be a "swell", which you would hardly notice. As the "wave" approaches a rising sea-bed, as the wave length gets shortened (due to drag along the bottom), its amplitude increases - sometimes (as in this case) substatially! BTW, the wave does indeed travel about 500 mph, at least till it encounters a rising seabed. If you must be on the water during a tsunami, the safest place is over the deepest part of that sea or ocean. ~ Happy sails to you ~ _/) ~
Diver Walked Ashore
According to the news today, a guy that was out diving (with tanks) when the tsunani hit just walked ashore after it was all over. He was uninjured. With a boat just try and get into deeper water.
According to the news today, a guy that was out diving (with tanks) when the tsunani hit just walked ashore after it was all over. He was uninjured. With a boat just try and get into deeper water.
Diver Walked Ashore
According to the news today, a guy that was out diving (with tanks) when the tsunani hit just walked ashore after it was all over. He was uninjured. With a boat just try and get into deeper water.
According to the news today, a guy that was out diving (with tanks) when the tsunani hit just walked ashore after it was all over. He was uninjured. With a boat just try and get into deeper water.
Energy
The term energy is thrown around casually. The energy must take some form. There is a dome of water which is only several inches high, but covers millions of square miles. That is the source of the energy. It becomes dangerous when it is funnelled as it moves onto shore. This especially true when it is squeezed from two directions, the water becoming shallower as it moves onto shore and when it moves into bay which constricts the water laterally.
The term energy is thrown around casually. The energy must take some form. There is a dome of water which is only several inches high, but covers millions of square miles. That is the source of the energy. It becomes dangerous when it is funnelled as it moves onto shore. This especially true when it is squeezed from two directions, the water becoming shallower as it moves onto shore and when it moves into bay which constricts the water laterally.
Energy
The term energy is thrown around casually. The energy must take some form. There is a dome of water which is only several inches high, but covers millions of square miles. That is the source of the energy. It becomes dangerous when it is funnelled as it moves onto shore. This especially true when it is squeezed from two directions, the water becoming shallower as it moves onto shore and when it moves into bay which constricts the water laterally.
The term energy is thrown around casually. The energy must take some form. There is a dome of water which is only several inches high, but covers millions of square miles. That is the source of the energy. It becomes dangerous when it is funnelled as it moves onto shore. This especially true when it is squeezed from two directions, the water becoming shallower as it moves onto shore and when it moves into bay which constricts the water laterally.
Try This Test
A wave in the open ocean does not displace water unless it is a breaking wave. It is merely energy moving through the media. A test for this (which I think I saw on Discovery or Nova once) is to place a bouyant object in a tank and make some waves and see if the object moves. I think the object actually oscillates or move forward a bit as it rides up the wave and then back the other way as it rides down the other side. Essentially no change in relative position after the wave passes. So energy is doing work to raise the mass of the boat vertically and the boat is doing work on the water when it falls back down and displaces some water via waves. This is not intuitive so it helps to actually see this. A bathtub might be big enough to try this out. So a Tsunami in the open deep water will not push the boat out of position. It might make it rise up a few feet very quickly? When a wave breaks on the shore it is the release of all that energy that piles up as the drag on the bottom forces the water to pile up and the top of the wave moves faster than the bottom until it falls forward. I'm sure a good physicist will provide a better description but hope this helps. Dave
A wave in the open ocean does not displace water unless it is a breaking wave. It is merely energy moving through the media. A test for this (which I think I saw on Discovery or Nova once) is to place a bouyant object in a tank and make some waves and see if the object moves. I think the object actually oscillates or move forward a bit as it rides up the wave and then back the other way as it rides down the other side. Essentially no change in relative position after the wave passes. So energy is doing work to raise the mass of the boat vertically and the boat is doing work on the water when it falls back down and displaces some water via waves. This is not intuitive so it helps to actually see this. A bathtub might be big enough to try this out. So a Tsunami in the open deep water will not push the boat out of position. It might make it rise up a few feet very quickly? When a wave breaks on the shore it is the release of all that energy that piles up as the drag on the bottom forces the water to pile up and the top of the wave moves faster than the bottom until it falls forward. I'm sure a good physicist will provide a better description but hope this helps. Dave
Try This Test
A wave in the open ocean does not displace water unless it is a breaking wave. It is merely energy moving through the media. A test for this (which I think I saw on Discovery or Nova once) is to place a bouyant object in a tank and make some waves and see if the object moves. I think the object actually oscillates or move forward a bit as it rides up the wave and then back the other way as it rides down the other side. Essentially no change in relative position after the wave passes. So energy is doing work to raise the mass of the boat vertically and the boat is doing work on the water when it falls back down and displaces some water via waves. This is not intuitive so it helps to actually see this. A bathtub might be big enough to try this out. So a Tsunami in the open deep water will not push the boat out of position. It might make it rise up a few feet very quickly? When a wave breaks on the shore it is the release of all that energy that piles up as the drag on the bottom forces the water to pile up and the top of the wave moves faster than the bottom until it falls forward. I'm sure a good physicist will provide a better description but hope this helps. Dave
A wave in the open ocean does not displace water unless it is a breaking wave. It is merely energy moving through the media. A test for this (which I think I saw on Discovery or Nova once) is to place a bouyant object in a tank and make some waves and see if the object moves. I think the object actually oscillates or move forward a bit as it rides up the wave and then back the other way as it rides down the other side. Essentially no change in relative position after the wave passes. So energy is doing work to raise the mass of the boat vertically and the boat is doing work on the water when it falls back down and displaces some water via waves. This is not intuitive so it helps to actually see this. A bathtub might be big enough to try this out. So a Tsunami in the open deep water will not push the boat out of position. It might make it rise up a few feet very quickly? When a wave breaks on the shore it is the release of all that energy that piles up as the drag on the bottom forces the water to pile up and the top of the wave moves faster than the bottom until it falls forward. I'm sure a good physicist will provide a better description but hope this helps. Dave
Sorry Dan, but...
You are incorrect on this one. It's been awhile since I actually used something I learned as a Geological Oceanographer, but this is a subject I know a bit about. A tsunami (incorrectly called a tidal wave) forms when a subsea geologic plate moves vertically relatice to another plate. It can also form when a landslide fall into the sea. In either case, the land movement causes an instant drop/rise in sea level - locally. That displacement of water radiates outward from the epicenter at speeds related to the wave's frequency or wavelength. The amplitude of the wave may be relatively small when compared to the depth of the sea where it occured, but as that wave moves into shallower water, it get interference from the sea bottom, which slows it down. However, as it slows down, its amplitude increases. Thus, funneling of the wave is not the reason a tsunami gets higher. However, it's the reason why a wave caused by tides (as in the Bay of Fundy) gets higher. Hope this info helps. Happy sails to you ~ _/)~
You are incorrect on this one. It's been awhile since I actually used something I learned as a Geological Oceanographer, but this is a subject I know a bit about. A tsunami (incorrectly called a tidal wave) forms when a subsea geologic plate moves vertically relatice to another plate. It can also form when a landslide fall into the sea. In either case, the land movement causes an instant drop/rise in sea level - locally. That displacement of water radiates outward from the epicenter at speeds related to the wave's frequency or wavelength. The amplitude of the wave may be relatively small when compared to the depth of the sea where it occured, but as that wave moves into shallower water, it get interference from the sea bottom, which slows it down. However, as it slows down, its amplitude increases. Thus, funneling of the wave is not the reason a tsunami gets higher. However, it's the reason why a wave caused by tides (as in the Bay of Fundy) gets higher. Hope this info helps. Happy sails to you ~ _/)~
Sorry Dan, but...
You are incorrect on this one. It's been awhile since I actually used something I learned as a Geological Oceanographer, but this is a subject I know a bit about. A tsunami (incorrectly called a tidal wave) forms when a subsea geologic plate moves vertically relatice to another plate. It can also form when a landslide fall into the sea. In either case, the land movement causes an instant drop/rise in sea level - locally. That displacement of water radiates outward from the epicenter at speeds related to the wave's frequency or wavelength. The amplitude of the wave may be relatively small when compared to the depth of the sea where it occured, but as that wave moves into shallower water, it get interference from the sea bottom, which slows it down. However, as it slows down, its amplitude increases. Thus, funneling of the wave is not the reason a tsunami gets higher. However, it's the reason why a wave caused by tides (as in the Bay of Fundy) gets higher. Hope this info helps. Happy sails to you ~ _/)~
You are incorrect on this one. It's been awhile since I actually used something I learned as a Geological Oceanographer, but this is a subject I know a bit about. A tsunami (incorrectly called a tidal wave) forms when a subsea geologic plate moves vertically relatice to another plate. It can also form when a landslide fall into the sea. In either case, the land movement causes an instant drop/rise in sea level - locally. That displacement of water radiates outward from the epicenter at speeds related to the wave's frequency or wavelength. The amplitude of the wave may be relatively small when compared to the depth of the sea where it occured, but as that wave moves into shallower water, it get interference from the sea bottom, which slows it down. However, as it slows down, its amplitude increases. Thus, funneling of the wave is not the reason a tsunami gets higher. However, it's the reason why a wave caused by tides (as in the Bay of Fundy) gets higher. Hope this info helps. Happy sails to you ~ _/)~
Nothing to worry about at sea
The tsunami wave travels under water until it hits shallow water. Unlike other ocean wave that are formed on top of the water, the tsunami wave is created below and stay below in deep water. You'll never might not even know it when under you. The problem come when the tsunami wave get close to shore! The wave rise up and breaks with great force. The surging water floods and destroys prosperity and our docked boats.
The tsunami wave travels under water until it hits shallow water. Unlike other ocean wave that are formed on top of the water, the tsunami wave is created below and stay below in deep water. You'll never might not even know it when under you. The problem come when the tsunami wave get close to shore! The wave rise up and breaks with great force. The surging water floods and destroys prosperity and our docked boats.
Nothing to worry about at sea
The tsunami wave travels under water until it hits shallow water. Unlike other ocean wave that are formed on top of the water, the tsunami wave is created below and stay below in deep water. You'll never might not even know it when under you. The problem come when the tsunami wave get close to shore! The wave rise up and breaks with great force. The surging water floods and destroys prosperity and our docked boats.
The tsunami wave travels under water until it hits shallow water. Unlike other ocean wave that are formed on top of the water, the tsunami wave is created below and stay below in deep water. You'll never might not even know it when under you. The problem come when the tsunami wave get close to shore! The wave rise up and breaks with great force. The surging water floods and destroys prosperity and our docked boats.
Too Brief
Ed. I have no doubt that your education in this area is more complete than mine. I was trying to explain something in a paragraph which obviously cannot be described completely, even if my knowledge was adequate to do so. My point was that people say "energy" as if that actually explains the phenomena. The energy is in some sort of form. In this case mechanical energy, as opposed to thermal, etc. It usually starts with some kind of movement on the ocean floor, usually downward. At some point there is usually a shallow dome which ends up propogating as a shallow wave front or swell in all directions.
Ed. I have no doubt that your education in this area is more complete than mine. I was trying to explain something in a paragraph which obviously cannot be described completely, even if my knowledge was adequate to do so. My point was that people say "energy" as if that actually explains the phenomena. The energy is in some sort of form. In this case mechanical energy, as opposed to thermal, etc. It usually starts with some kind of movement on the ocean floor, usually downward. At some point there is usually a shallow dome which ends up propogating as a shallow wave front or swell in all directions.
Too Brief
Ed. I have no doubt that your education in this area is more complete than mine. I was trying to explain something in a paragraph which obviously cannot be described completely, even if my knowledge was adequate to do so. My point was that people say "energy" as if that actually explains the phenomena. The energy is in some sort of form. In this case mechanical energy, as opposed to thermal, etc. It usually starts with some kind of movement on the ocean floor, usually downward. At some point there is usually a shallow dome which ends up propogating as a shallow wave front or swell in all directions.
Ed. I have no doubt that your education in this area is more complete than mine. I was trying to explain something in a paragraph which obviously cannot be described completely, even if my knowledge was adequate to do so. My point was that people say "energy" as if that actually explains the phenomena. The energy is in some sort of form. In this case mechanical energy, as opposed to thermal, etc. It usually starts with some kind of movement on the ocean floor, usually downward. At some point there is usually a shallow dome which ends up propogating as a shallow wave front or swell in all directions.
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