what caused the earthquake in the movie san andreas
Raymond "Ray" Gaines is a Los Angeles Fire Department Air Rescue pilot in the midst of a divorce from his wife and planning a trip to San Francisco with his daughter Blake. Meanwhile, Caltech seismologist Dr. Lawrence Hayes and his colleague Dr. Kim Park are at Hoover Dam doing research for a new earthquake predicting model when a nearby and previously unknown fault ruptures. This triggers a 7.1 magnitude earthquake that collapses the dam and kills Park after he rescues a little girl and throws her to Hayes as he falls to the collapsing ground. When Ray is called into work because of this, Blake goes with her mother's new boyfriend Daniel Riddick to San Francisco, instead of Ray.