A lot depends on how the fault line runs.
Our Northridge Earthquake caused concentrated damage from Northridge down to the long beach area. That’s about 12-15 miles. Strangely enough, a mile off that line, and folks may not have received much damage at all.
Even a few blocks of that fault line was critical to the amount of damage.d
Not trying to say no damage happened at distance, but it was not what you would think would accompany a serious quake like that.
The 6.6 Sylmar Earthquake was about the same size as Northridge and in the same general area.
There was a family in Fullerton’s hills 50 miles from the epicenter who had their swimming pool emptied by the quake. The water sloshed out in one big wave, taking a sliding glass door with it through the house. Barely missed hitting one of their kids. Inspired them to have the pool taken out.