>>866521Man, you're free to laugh at me, but there's something wrong here.
1. Earthquakes. There's a large number of faults concentrated on the west coast, and most of them are in California (a cursory Google search highlighted a total of fourteen, if not more). This seems like an abnormally high amount of tectonic activity to be contained in such a relatively small area, especially since barely any of them extend beyond the state border.
2. Proximity to the ocean. Even ignoring that Lovecraft's Great Old Ones were often strongly tied to deep sea, the ocean is largely uncharted territory, meaning there could be things lurking down there that mankind isn't even capable of imagining. Not to mention the Bloop, which was A) likely made by a living creature, B) a "big" enough sound that whatever produced it would have to be bigger than a blue whale, and C) recorded in the southern Pacific Ocean... at roughly the same coordinates as the sunken city of R'lyeh.
3. The people of California. Simply put, Californians are insane, or at least the vocal majority of them are. Normally you could attribute this to the heavy sociopolitical activity that tends to arise in big cities - after all, if the place is important enough to warrant a big gathering, you're bound to attract some crazies - but even people who aren't native to the area change after extended stays there. I've had friends who were right-wing all through high school leave to go to college in California, and when they come back they're almost unrecognizable. It goes beyond drinking the Koolaid, they are fundamentally CHANGED, like they don't remember being different from how they are now.
Conclusion? Between the earthquakes, the ocean, and the insanity in the populace, there's something - maybe a Great Old One, or something very similar - buried underneath or near California, and it's stirring. Slowly but surely it's waking up, infecting the minds of the people above in its sleep like Cthulhu did to Henry Wilcox.