Hope they have a good stay and safe trip, quakes are funny sometimes where they are felt or propagated too, not sure of the exact distant form the epicenter but Machu Picchu is built into a pretty solid chunk of mountains..
All this quake activity makes me nervous. I'm going to visit my bro in Santa Rosa next week. They are very close to the San Andreas Fault line.
This Cajun boy is used to Hurricanes, which gives you time to duck. Quakes aren't as courteous.