Ray Gaines (Johnson), a helicopter rescue pilot for the LAPD, is still reeling from a family tragedy. Just as he’s about to finalize a divorce from his wife Emma (Carla Gugino), a massive seismic event erupts along the San Andreas Fault—a 9.1 magnitude quake that turns California into a crumbling, fire-spewing death trap. Ray’s mission? Fly from Los Angeles to San Francisco to save his estranged daughter Blake (Alexandra Daddario), who is trapped somewhere in the city with a plucky British engineer and a precocious little boy. Meanwhile, Emma gets rescued by Ray, and the two rekindle their marriage while dodging falling skyscrapers, tsunamis, and one very iconic collapsing Golden Gate Bridge.
At its core, San Andreas is an exercise in the "imagination of disaster," a concept famously explored by Susan Sontag. The film depicts a cataclysmic 9.6 magnitude earthquake that levels everything from Los Angeles to San Francisco. While visually arresting, this is where the movie departs sharply from reality: san andreas movie
In the film, the primary quake is a magnitude 9.1 to 9.6. In reality, the San Andreas Fault is a strike-slip fault, meaning the plates slide past each other horizontally. Geologists agree that this type of fault is physically incapable of generating a "mega-thrust" quake above a magnitude 8.3. A 9.1+ magnitude earthquake typically occurs in subduction zones (like the 2011 Japan earthquake), where one plate dives under another. California does not have that. Ray Gaines (Johnson), a helicopter rescue pilot for
The calm is shattered at the Hoover Dam. A seismologist at Caltech, Dr. Lawrence Hayes (Paul Giamatti), detects a series of unusual tremors. Before he can issue a proper warning, a 7.1 magnitude quake rips through the dam, reducing the concrete monolith to rubble. This is merely a foreshock. Fly from Los Angeles to San Francisco to