building behind you? my goodness. let me bring in usgs seismologist gavin haisz. when -- gavin hayes. when you look at the intensity, 7.3, and for comparison the initial quake killed more than 8,000 a couple of weeks ago, that was 7.8. perspective wise, how -- who is the rarity for this to happen a couple of weeks from one another? >> well, the likelihood of a magnitude 7.3 after a magnitude 7.8 aftershock is not incredibly small. it's not an unexpected event. >> i hear you have maps to show me? >> i do yes. i have a map of the distribution of the aftershock that occurred after the .8. in the region there have been 100 aftershocks since the april 25th event. this magnitude 7.3 aftershock has had several aftershocks of