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Tweaking, essentially, this one to get it right if that happens, but i think at the same time you'd be looking for a back-up system. >> we'll check back with you tomorrow, ellen, if we can. thanks very much, ellen prager, joining us from miami. just ahead, we'll have the latest on our coverage of the mystery of flight 370 as we're tracking that bluefin-21 on this, its second day of searching. the air search, by the way, is resuming right now, as well. and authorities are charging frazier glenn cross, there he is, with murder charges, but are they calling the shooting at the jewish communit...

Topography is rough and rugged. once they start looking at the images, it's just going to take time. hopefully it's down there and again get the family some news. >> hopefully you're right. ellen, let's wait and see. appreciate it very much, ellen prager, appreciate the challenges that await this search. coming up, we'll see how the passengers' families are reacting about the search for the missing jet. up next, new and violent developments unfolding right now in ukraine. president of the united states calling the president of russia. what happened in that phone call? stay with us. you're ...

And you get those pictures from the tsunami of the water sweeping back out to the ocean with very powerful currents that you have to worry about. >> dr. ellen prager, thank you for joining us with the details on what a tsunami is about. appreciate that. we'll move to london. michelle kosinski is live there. with all the building damage that we're seeing. this is from vina del mar. >> it looks like i'm looking away from the camera, i'm actually seeing the pictures at the same time you're seeing them come in. we are seeing more of the damage. especially with light. we figured out that this happe...

Or does it decrease as it travels? >> well, that's a great question that people are always wondering. what happens in a tsunami is they travel very fast. but oceans, almost at the speed of a jet airplane. but when they approach the shore and the water shallows, what happens is they begin to feel the bottom and bunch up. and that's when we start to see the rise in height of the waves. but they actually slow down when they hit that shallow water because of the friction from the bottom, essentially, you can think of it like that, slows it down. the thing is when they hit the shore, you can think ...

Areas of alaska exist. joining me is a marine scientist and author who has written extensively on ocean science and that would include tsunamis. good morning to you, dr. prager. >> good morning, alex. >> how concerned are you about the coast of hawaii at this point and other areas, easter island, the juan fernandez islands also known as robinson caruso. what kind of tsunami are we talking about here? >> it is very hard to predict the height at this point because things along the way, as the wave moves across the ocean are going to determine the height. but i think the people who model this hav...