It just seems like water is somethingharmless. This is due to the fact that in ordinary life we rarely encounter volumes of this substance exceeding the volume of the pool. In reality, a meter-high cube of water weighs like a car and, moving at a speed of even 40 kilometers per hour, it can do a lot of things. Now imagine a wave 30 meters high, rushing at a speed of 50-80. Such tsunamis take hundreds of thousands of lives if they hit large settlements (for example, in Southeast Asia). Now scientists have predicted the arrival of a wave 300 meters high, which will fall in Alaska near Anchorage, possibly even this year. Why is this happening and what is the danger?
- 1 How tsunamis originate
- 2 Scientists are waiting for a 300-meter tsunami in Alaska
- 3 How to warn about the threat of tsunami
- 4 How to escape from the tsunami
How tsunamis originate
Usually tsunamis are giant waves that bloweverything in its path - originate in the ocean, in those places where there are tectonic faults. That is why there is the concept of a tsunamo-dangerous region. In such places the probability of “killer waves” is very high. Local authorities are trying to take measures and build some kind of special shelter, but given that it is necessary to deal with the forces of nature, one does not have to rely on man-made remedies.
The only effective way to protect isshelter at a height, away from the ocean. In dangerous regions there are even special signs where to run in case of a warning about the danger. Thus, one can save lives, but not property that will inevitably remain on the shore.
As a result of the sharp rise of a part of the ocean floor, caused by the fact that one plate is on top of another and rises up, a large volume of water is pushed out. During displacement one of the plates can rise 5-7 meters along its entire length. This is enough to create a tsunami,which in the open ocean can have a height of 3-5 meters and can hardly be felt by medium-sized vessels. But, having reached land, as the bottom rises, the lower part of the wave slows down, and the upper part grows. And so dozens of meters high waves form.
Scientists are waiting for a 300-meter tsunami in Alaska
There is another way of generating huge waves. Try throwing a stone into the water. What will happen? Of course, a wave will go. And if you throw a stone into a thaw or just an elongated puddle (for example, in a rut from the wheel), the wave will be even larger, since it will have an orientation. The volume of water will not be displaced in all directions, but only in two. In the end, it will only increase.
Now imagine how the water will behave if you throw not just a stone at it, but a stone that weighs millions of tons. Scientists expect something like this in Alaska.
The fact is that in this region a lotglaciers and narrow bays that go many kilometers inland. Now scientists have sounded the alarm and predicted that in the area of Prince William Bay, which is located east of the Kenai Peninsula, a huge tsunami can form, with a height of 300 meters. To make it easier to imagine such a height, imagine how you stand inside Moscow City and look up at the skyscrapers. Or how you stand on the observation deck of the Ostankino TV tower and the wave exceeds half the distance to the ground.
Local unit alarmsGeological and geophysical services. According to the director of the department, Steve Masterman, his colleagues received evidence that the rapid melting of the Barry Glacier, which is about 50 kilometers from the city of Whittier and 121 kilometers from Anchorage, could be a real catastrophe.
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If the predictions of scientists are correct, then the threat of tsunami in the next 20 years is estimated as almost one hundred percent. There is even a chance that this will happen.already this year. Here's a twist. However, this is not the first tsunami of such height that occurs in this region. It was here in 1958 that the highest tsunami in the history of observations was recorded. It happened in Lituja Bay. Then the wave height was 524 meters. When we published this information, there were quite a few interesting discussions in our Telegram chat. At that time, fortunately, almost no one saw this, except for the sailor, who gave out some incoherent story. As a result, only 9 people died, and the wave height was recorded when analyzing vegetation damage on the steep banks of that zone.
A new tsunami will occur for the same reason. Namely, due to the fact that as a result of the melting of the glacier, millions of tons of stones and ice will fall into the water. Water will simply have nowhere to go and along a narrow fjord, it will rush in the direction opposite to the impact.
How to warn about the threat of tsunamis
As a result of large tsunamis, a lot of people die. For instance, during the tsunami in Southeast Asia in 2004, more than 200,000 people died. It can be assumed that preventive measures can save at least a thousand lives.
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To prevent tsunamis in dangerous regionsa large number of seismic sensors are installed. Data is collected from them online, and as soon as something suspicious happens, an alarm immediately sounds. To disseminate warnings, television, radio, street warning systems and, more recently, cellular communications have been used. After all, it is much safer to warn people to go a few hundred meters from the coast on a hill than to leave everything as it is.
In addition to seismic sensors, waterborne fixation systems are used, which collect additional data to analyze the situation and make even more accurate forecasts.
However, such systems give warnings in a couple of tens of minutes, since they cannot predict the movement of tectonic plates. In the case of landslides, they can be predicted for a much longer time.
How to escape from the tsunami
Technically, escape from the tsunami if you found out about him in a few tens of minutes before his arrival, not so difficult. Of course, in practice, in this situation, people get lost and act a little differently. But in any case, you need to know how to act, and do not forget about it, being on the seashore (especially in dangerous areas).
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First of all, one must understand that salvation is only on a hill. To do this, you need to find signs on the streets in advance where to run in case of warning. There are such in all dangerous areas.
Do not stare at the sea, if itretreated. This is a sure sign that just a few minutes are left before the wave arrives. However, some people do not know this and begin to examine the seabed with interest and enjoy the unusual phenomenon.
In theory, this is all that you need to know to be at timesincrease your chances of salvation. The main thing is not to get lost, and in case of danger, quickly run away from the coast to a hill, leaving everything that prevents it from doing this. Half-meter waves are fun and entertainment on vacation. Meters are dangerous. And waves tens and hundreds of meters high are deadly - no options. Only to run.