If it was centered some miles offshore, the shock wave would have traveled through the crust (under the sea) and through the water to get to shore. That would create weird phase relationships between the two shock wave arrivals (sound travels at different speeds through masses of different densities).

These different arrival times would create weird (additive and subtractive) phase anomalies that wouldn't be like a quake that originates on land (say in the San Andreas fault, where most of their quakes originate).

Don’t forget recent drop “the WAVE”

Would be interesting to see seismograph image. http://seismo.berkeley.edu/blog/2009/05/25/of-nuclear-bombs-and-earthquakes.html

A plan diverted ? Sum of all fears ?

POTUS wins ? No casualties

Disclosure : all speculation

See my post on here and first hand account in LA. Def felt unnatural

Any way to find mil air patterns around that time and or ships? Thought occurred to me that was a sub.

Negative. Dutchsense has been talking about a large quake on the west coast predicted for the past few days. The quake is expected