This is a perfect example of (hysteria?) exaggeration. There was no violent shaking in California, let alone anything to cause the above.
You could be at dead-center epicenter of a 7.2, and you wouldn't have "2-3 feet high splashes".
Umm...yes you would. Easily.
I was quoting ‘Positive’ who is in Temecula.
And, yes, we had significant sloshing of water out of the pool in West L.A./Culver City... not an exaggeration... due to the prolonged rolling motion.
Because of the strength of the quake, which was a sharp shock near the epicenter, the outlying areas feel it as a rolling motion. This was explained on KNX News Radio.
A lot depends on weather the shaking matches the resonant frequency of the water in the pool.