There was an earthquake every single day this week, then the big one, 6.9. Usually, that exhausts a fault and protects from future quakes for some time. But not this one, because the main fault has not yet been released. This last one was the biggest in about 39 years. The only reason there weren't many deaths, as happened in Amatrice, is that many people had already evacuated the area because every single day there were not just aftershocks, but new earthquakes. They just didn't rise to the horrible scale, but there have been earthquakes every day, then the big one, which fortunately occurred after most had evacuated.