human
What causes earthquakes?
gpt
The world is constantly vibrating because of tectonic plates.  If a piece of the tectonic plate were to slip and break, it could cause a big earthquake.
human
Can they be predicted?
gpt
Not really.  Seismologists don’t understand everything about earthquakes yet, so it can still be difficult to predict when they might happen.
human
Why are there so many in California?
Fault lines run through California.  This is the “Ring of Fire”, and it has a lot of tectonic activity.  California is also the most populated state in the US.
It’s because of the way California’s tectonic plates meet.  A lot of earthquakes occur when plates move together, and California is on the edge of many of the tectonic plates.