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They call them an aftershock, but every aftershock is an actual earthquake and you ski the pictures from this one and imagine after the one a month ago 9.0, and things are rattling around like that, terrifying. this is 30 miles by the way southwest of the fukushima daiichi nuclear plant which is still having lots of trouble as well. they are pouring -- in fact this earthquake affected thele cooling efforts of pouring water on the plant to keepb the rods cool. a lot of power was knocked out when the quake happened and stopped the cooling for a while, so a terrible thing for this country and mor...

That was on march 15th. building in an x for they are trying to establish a power line, a reading of 20 per hour. one of the reasons they are concerned. three millis sieverts a year, it is not uniform throughout here see you can't read too much into that. cordoned to look at. it has changed the rating. if you look at number five, they are talking about wider consequences, the real potential of radiation leaks. you might have some deaths associated with this, broader contamination. that is where we are, range from 1979. all the way up to chernobyl in 1966, these are big jumps. not an easy chang...

Too much into that, but it's important to look at. what it has done was change your rating. number five where they are now, they're talking wider consequences. the real potential of radiation leaks or maybe we've already had them, they believe. you may have some deaths associated with this. you may have boder contamination. that's about the three-mile island range. the next steps are serious accident number six and all the way up to chernobyl in 1966. these are big jumps, too. it's not an easy change to make here. that's what authorities have. they've looked at more information. they're intens...

Systems there and bringing that one under control. number three is where they're focusing most of the cooling efforts because they simply see an opportunity there. they believe they might be able to do that. but number four in many ways remains the biggest worry simply because number four has had so much damage. again, those spent rods are exposed and it's not clear if they have any cooling around them or not. >> thanks so much, tom foreman. just when we begin to understand one problem, there seems to be another. joining us now, cnn contributor jim walsh, an expert on international security at...

700 times normal levels. authorities say it's still low and likely to have been caused by the radio activity from the blast at the fukashima plant. it has called a low state of emergency there. sea water is being used to clean at least two reactors to clear them up and cool them down. they are trying to keep temperatures down at unit 3. there has been much talk about explosion there. unit 2 was a problem. they used water to cool it. this comes after a blast yesterday at fuka shrksshima on. expert says the use of sea water shows how serious the problem is. people have fled the area. >> it's the...