some up to six points on the richter scale. and that's the reason that the tsunami alert ran through the entire night. it was lifted 50 minutes ago, before 7:00 a.m. local time. the tsunami alert was finally lifted for the entire country. people were up all night because of those aftershocks. and then, of course, the unpredictability of the tsunami. >> joe, talk to me about the epicenter and the area most impacted. is it a rural area? an urban area? what can you describe? >> we're waiting to hear the full extent because of the rural areas that would have been impacted. the sun is just rising here. and people trying to make contact with some of these fishing villages with older style adobe houses which may well have been impacted. even more strongly by this quake. but the major urban centers are two cities in the north, iquique and arica. iquique in particular spent most of the night without power.