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Photography. it shows the volcanic island, the child of krakatoa, in august. and then after the eruption on the 22nd of december, the eruption that trigger ad i massive landslide of more than 50 acres of mountainside into the sea that created this deadly tsunami that's killed at least 430 people. the indonesian authorities initially had sensors that were prepared to detect an earthquake that could trigger a tsunami with a minimum 5.0 magnitude. the volcanic eruption is much lower than that. they say they're tweaking that to make it more sensitive. and they're also testing this early warning sy...

That deadly wave hurtling toward the coasts on both sides of the strait. now the authorities say that their seismometers, their detectors were not rigged basically to detect something of this magnitude. that they're set up to detect earthquakes of 5.0 magnitude or more, and this was actually much lower if you can believe it. so they're adjusting those sensors. they're also starting to test their siren early warning system. take a listen. [ siren ] now some of this is a little bit too little too late because indonesia is vulnerable to tsunamis. there was a horrific tsunami in 2004 that killed h...

Hong kong to explain. ivan? >> reporter: good morning. indonesian authorities are under pressure to better protect their long and vulnerable coastline after at least 430 people were killed on saturday. more than 100 still missing. tens of thousands worried about going back home for fear of a followup tsunami. one of the measures, they've announced they'll test this early warning system on the 26th of every month. take a listen. [ siren ] one of the measures. also one of the other agencies has announced that it's going to dial up the sensitivity of its kind of early warning system to test tremo...

Vice president, with the administrator of fema. we have the regional head of fema coming up to the state as well as the second in command here who will also be on his way. so the response teamworking from the federal level working in conjunction with the state and the municipal, these are the integrated teams that needed to be put in place to begin the initial assessment. then we move forward from there. dan? >> just real quick. make no mistake, this was a big one. my wife was texting me. she's in anchorage, when this was happening. we've had a lot of aftershocks. some above 5.0. as congressma...

Significant number of after shocks. they can be 5.0 magnitude, 4.0. they're gonna last for a significant amount of time. so the larger the earthquake is, the more after shocks you have, the longer they last, and the more frequent they essentially are. so unfortunate for people who are going to be recovering from the main shock are going to have to deal with those after shocks. as you've heard, it's going to get colder and darker soon. tough situation for them there. >> dana: all right. dr. ellen prager, thank you very much for being with us. we will continue to update you on this breaking news...