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Really ultimately tell us this was a natural earthquake. as opposed to manmade. what they are trying to say is this particular earthquake, the 3.5 with a depth of 5 kilometers, was different than a lot of the wavelengths we were seeing in the previous ones. take for example the one earlier this month that was a 6.3 that north korea had told was a manmade. what they are saying is they are noticing discrepancies in the wave forms, but they also make the statement we cannot conclusively confirm at this point the nature of the event. they are not quite there yet to actually announce and confirm, r...

Enhance your reception. >> that's why he says, les, here is a thing that says shape of the pulses. because if you can't hear it, then there is a certain shape whatever the instrument that is picking it up. >> i wanted to get a visual picture what these folks are doing with all this instrumentation. they're not actually hearing something. they're more than likely looking at a visual. >> they're watching it. that's right. >> and you put together, there is another -- i don't know if you have another graphic that you put together. and it's got the one with the green lines. what was that one? what ...

Explanation as to what -- and we have some visuals to show of that. you have very simple explanation as to how we figure this out, if it's actually pings from the black box. you say number one is frequency. >> yes. we're looking for 37.5 kilohertz. >> okay. >> on the screen you see two different wave forms. one is of a constant frequency. and the other one is what we call a chirp. where you see on the left side and the right side, they're different frequencies. they're varying, different amounts. so if this pinger was programmed to be a chirp, you would recognize that and it would be different...

>> certainly sounds like we're getting into an area of interest. obviously we don't know if these are associated with the aircraft yet, but it certainly looks like we're seeing a lot more debris and just general nflotsam in th water. >> it's very telling that in the former area of search the plane saw virtually nothing even though satellites were picking up debris left, right and center, but when the planes went to look for it, they couldn't find it. that could be the product of the wave forms and the water. but here just as soon as they went into the search area, the new area, wolf, they were...

The u.s. geological survey. we cannot conclusively confirm the active nature of the event. they don't know if this was natural or a man made quake causing the tremor. the wave forms are different than previous emptss a t this site. they are trying to make that distanks which means they cannot say what the trigger was for this particular quake. the depth of this earthquake is poorly constrained and has been held to this. and again, at this point in time, the u.s. geological survey gone with 3.5, depth 5.0. as ben pointed out, lower than the previous ones. not just the one beginning of the month...