Your roof-mounted solar system is rated and certified by independent labs. They have been verified through rigorous structural calculations and structural reviews. The solar system will not do any additional damage to your home that would not have already been done by an earthquake, especially in California.
All structures are built to earthquake standards. The solar that is put on the roof is upheld to those standards. There are no dangers associated basically with putting PV on your roof, that wouldn’t already be there if you were just under a standard roof.