Alquist Priolo Special Studies Zone Act is a law in California that helps protect people from earthquakes. It was made because California is located near lots of big faults, or cracks in the ground where earthquakes can happen.
The law says that if someone wants to build a big building, like a school or a hospital, in an area where earthquakes are likely, they have to be very careful. They have to do special studies to find out how strong the ground is and what kind of earthquakes might happen there.
The law also says that if a big earthquake does happen, the building has to be checked to make sure it's still safe to use. If it's not safe, people can't go inside until it's fixed.
So basically, the Alquist Priolo Special Studies Zone Act helps keep people safe by making sure that buildings in earthquake-prone areas are built and checked in a way that reduces the risk of harm.