You are correct - For a Mag 6, maybe a Mag 7 on the San Andres or other inland fault.
But. Up north, on the Cascadia Subduction Zone offshore quakes, there are almost no “inland” earthquakes at all until the BIG offshore Mag 8 or Mag 9 earthquake trips off.
In fact, since no earthquakes were felt “at all” between the first settlers in 1830’s and 1995 when the massive coastal subduction traces were found of the 1703 Mag 9 were found in the coastal forests, people though the BC-WA-OR coast was fault-free.
We drove that coastline last September from just south of Cape Mendocino to where the road turns inland to Petrolia. Very scenic, with a black sand beach.