Mr. Speaker, I thank the gentleman for yielding to me. I certainly appreciate his sponsoring this particular Special Order and particularly his encouragement of the American people to contribute. We are impressed that the President has…
Mr. Speaker, I thank the gentleman for yielding to me. I certainly appreciate his sponsoring this particular Special Order and particularly his encouragement of the American people to contribute.
We are impressed that the President has designated $350 million to deal with this tragedy, but I would like to point out that that is very little more than $1 per person this country and very little more than $2 for every working person in this country. Certainly we can do better than that, and I encourage all Americans to send contributions to the charities that the gentleman mentioned. I would also mention the American Red Cross will play a role in this through its international arms. I am also aware in my community of relief organizations such as the Christian Reform World Relief Committee, which is very active in this. International Aid is another organization in Spring Lake, Michigan, which has dispatched $3 million of medical equipment and other supplies already. And I am sure every American can look around their own community and find similar organizations that they can contribute to to help during this incredible tragedy.
We certainly want to express our sympathy as the American Congress and the American country to the people who have suffered this tragedy. It is almost incomprehensible. For years scientists have talked about the possibility of a mega-tsunami and it has largely been dismissed even though tsunamis can be very large, but the idea of a mega-tsunami has been dismissed by most scientists. This one does not quite measure up to that in terms of the power and the energy it contained, but it certainly is a mega-tsunami in terms of the damage and the death, the destruction that it has caused. So I do want to express my personal sympathy and that of the Congress for those who are suffering and encourage all Americans to help.
But the main thrust of my comments this evening are going to be about the science of tsunamis. That may seem inappropriate at this point when we are all dealing with a tragedy, but I know there is a lot of interest because I have fielded a number of questions from colleagues and staff in the Congress, and so I think it is worth time talking to our colleagues about what a tsunami is, how it happens, particularly as it relates to the possibility of developing a warning system for tsunamis.
First question, how do tsunamis occur? They have four major sources. Earthquakes are the primary source but also volcanos can cause tsunamis either through eruption or collapse. Other possibilities are landslides, slumps, or rock falls. If they are large enough, they can cause tsunamis. The last category is more esoteric. Asteroids, meteorites. They are very rare, but they cause the largest tsunamis. And also man-made explosions, which many people think could cause them, but, in fact, it would be very difficult to do that. I will discuss each of these a bit later.
But let me also address, first of all, why we cannot warn people. And I should mention some have asked me why the name ``tsunami,'' why do we use that. Do we not have an American term? Actually we do not have an equivalent American term. It is from two Japanese words that mean harbor and wave, and that is literally what it is. It is primarily waves in harbors or coastlines.
If we look at the natural disasters we have in this world and the warning systems that we have, if we look at the very largest natural disasters, such as volcanic explosions, we generally have hours to months of warning time before a volcano will explode, and the emphasis is generally on months provided we have seismic devices measure the activity within the volcano. Hurricanes, we have days in which to prepare and to evacuate or to tighten up our homes or other buildings. Tsunamis, we could have hours of warning if we have a good warning system, and that is the big ``if,'' which I will talk about a bit later.
Tornadoes we generally have 10 minutes to an hour of warning. And earthquakes we have no warning whatsoever. We know of no good warning system for earthquakes. Although there are some precursors, we can never predict an earthquake precisely. And since earthquakes cause most tsunamis, that means it is very difficult to predict tsunamis. But because they take from minutes to hours to reach the shore once we detect the earthquake and detect whether or not it causes a tsunami, we do have some warning time available and we have a warning system in the Pacific Ocean, which has been quite successful.
Let us talk about some of the science behind tsunamis. Why do they occur? What is going on? How does an earthquake cause a tsunami? First of all, not all earthquakes do. If it is an earthquake that does not cause much shifting of the surface under the ocean, there is generally not much of a tsunami. Also if it is a weak earthquake, it generally does not create a tsunami. But if we have a large earthquake, let us say above about 7.0, in that neighborhood, on the Richter Scale, and if it involves substantial motion of material, we will get a tsunami.
And the most common way in which these are called is when there is a subdeduction, when a tectonic plate sliding under another tectonic plate in the ocean and if there is a big movement and if it extends for many miles or many kilometers in the direction, we get a lot of motion in a very quick time. The water pours in to try to fill up that space. It is sort of like throwing a rock in a pond, and we get ripples coming up. But if we are talking about an ocean, and a typical ocean depth is in the neighborhood of, let us say, 15,000 feet, we have a huge amount of water being moved in a very short time, and it is like throwing a very, very, very large rock in the ocean.
The waves that spread out from this disturbance are not very big. Typically the wave that is caused by an earthquake or an underwater volcano will only have a height ranging from a few inches to a few feet. So the waves that are traveling across the ocean are barely noticeable to a ship that is sailing on the ocean. And that is why we have this strange situation, terrible destruction around the Indian Ocean now, but the fishermen who were out in their ships were not injured. They scarcely even knew that they were lifted up a foot and then let down again as the wave went under. But the waves are very deep; and as they approach shore, it becomes shallower. All of that energy of motion is condensed together and the waves add together and create huge walls of water that hit the coast and travel inland from the coast.
So if we have an earthquake, a volcano, a landslide, a slump, a rock fall, anything that generates motion of a lot of water, as that spreads out across the ocean, it loses a little energy but not very much, and depending on the depth of the ocean, it can travel very rapidly. If the ocean is deep, we can get speeds of these waves on the order of the speed of a jet airplane. And it is just a tremendous speed to travel. That is why we do not have much warning time, because they travel very rapidly.
As they approach shore, as I said, they slow down, mount up, and we get this huge wall of water. And it depends entirely upon the geology of the area, the shape of the land, the nature of the source of the earthquake. One of the most destructive that occurred was the one up in Alaska some years ago, and it was not that large an earthquake, but the wall of water that hit the land was over 100 feet high. It hit a reinforced concrete lighthouse and demolished it and killed everyone inside. It had that kind of force, much more force than we had in the Indian Ocean last week, but it did not have as great
an extent. Interestingly enough, that tsunami which was close to Alaska did cause substantial damage in Hawaii and killed more people in Hawaii than it did in Alaska because Alaska is not very heavily populated and Hawaii is.
So we have many different sources of tsunamis, and I hesitate to go into a great deal of detail on that. I do want to point out for the people who like to be terrified or those who like to make movies to terrify people that the largest tsunamis, as I mentioned, would result from asteroids or meteorites. If one of those lands in an ocean area, we would have a tsunami that could totally decimate all of the surrounding coastal area for miles inland. That has happened in the past geological history of this planet; but, in fact, it is quite rare. Usually the time between those is measured in millions of years, sometimes many millions of years.
What about the warning system? As I said earlier, we do have the Pacific warning system. It has worked fairly well. What we have to do is have a good system to detect earthquakes since they are the main cause and seismographs that could not only detect earthquakes but could detect a volcanic explosion or a volcanic collapse, anything that would move a lot of material and therefore create a big hole for the water to pour into or else an explosion that would make the water move out.
So if we have the seismographs that can detect that, then we have to have a method of calculating where the earthquake occurred, and we have that in many parts of the world. Unfortunately it took a while to establish the exact location of the earthquake in the Indian Ocean and find out its magnitude and find out really what the danger was. And then that tells us the starting time of the tsunami.
Then we have to be able to detect the motion of it, the velocity. So we have to have buoys displaced around that can measure these waves I mentioned, which are not all that large; but we have to have a buoy system that can detect that so we can calculate the speed.
And above all we need a warning system that will send out a warning to the people in the countries that are going to be hit. That is where we completely failed in the Indian Ocean, because no one expected a tsunami of this size in the Indian Ocean. The Pacific system has worked reasonably well, but even then we cannot always predict far enough in advance exactly where it is going to hit and how hard it is going to hit. And as I said before, not every earthquake results in a tsunami.
So we are going to have false alarms. We may send out the alert and the people will all quickly evacuate the coastal areas, get to high ground, and there is just a minor little wave that comes in. It is like the boy who cried wolf. If this happens several times, people say, well, it is a good warning system, but we really do not need it. But we never know when the big one is going to come, so people have to be trained to follow the warning system no matter what and recognize that not every time will it result in a major tsunami in every location that is warned, but sometime it will.
I believe it is incumbent upon us to lead the way as we have in developing the Pacific Ocean tsunami detection system which has saved a lot of lives. We cannot protect against a tsunami; so we cannot stop the property damage. But at least we can save the lives.
We know how to do it. The problem is, the nations around the Indian Ocean and in other threatened areas are going to have to join the effort and, above all, they are going to have to develop a warning system and train their people how the warning system will work and how tsunamis work so that they will take the warning seriously and flee to high ground at the first indication of any disaster of this sort.
I thank the gentleman for yielding me time, and I hope I have not taken too much time. But as I said, since so many people are interested in the nature and the science behind tsunamis, I thought this might be helpful, particularly as this Congress will be involved in the next year or 2 in helping to decide on what type of warning system should be developed worldwide and what our role is going to be in that.
Lest we think that all the tsunamis are in the Pacific, just because the majority are, be aware that there is potential for huge tsunamis in the Atlantic and, as we all know, we have a heavily populated Atlantic coastline, New York City just to name one major population center, but all the way from Maine down to Miami. We will have to worry about it. And the likelihood of it is small, but if it occurs, the probability of major damage is so high that we should not just concentrate on the Pacific Ocean, the Indian Ocean, but we should also worry about the Atlantic Ocean and our eastern seaboard.
Mr. Speaker, I just wanted to mention one point which I did not include, a very practical point for anyone who is in an area that might suffer a tsunami. There is a very natural warning system that nature provides, but it is very short term and that is before a tsunami, before the big waves roll in, the water recedes, not always, but almost always, and that is precisely what happened in this case. In fact, that killed more people because they did not recognize it. Any time one is on the coast and you see the water receding for some unexplained reason, head for high ground. That is your first warning. But, in fact, what happened, all the fish were left stranded on the shore, people rushed out, and especially children rushed out to grab the fish because obviously they need the food and they were out there beyond where they should have been when the water hit. They had no chance of survival whatsoever.
So there is one good warning system every person in every country should be aware of, in case you are ever on shore, you see the water running out, you run in, and head for high ground as fast as you can.