Hi Mary,

I don't know of any data which would support that. I have seen some paleoseismic evidence that Mecca and Wrightwood have had ruptures during the same time frame. I don't remember the authors, but there is one study that shows the microseismicity near Obsidian Butte moving north away from a segment named the Rico fault. Not sure if a rupture could cross the Brawley seismic zone
and conjugate with the SAF. Brawley is the interface between divergent and transform fault systems. And it can get very active at times.

Glen