Will California Fall Into the Ocean?

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Season 3: Down to the Core · Posted November 11, 2026 · 1 minute 6 seconds

The short answer

No. There is nowhere for California to fall. The ocean is not a hole: its floor is more land with water on top. What California does is slide. West of the San Andreas Fault, the land rides northwest past the rest of the state, carrying Los Angeles toward San Francisco about 2 to 5 cm (an inch or two) a year.

San Francisco sits east of the fault, so Los Angeles slowly closes in. The US Geological Survey once put the meeting about 15 million years from now. The shore does wear away, as when high surf red tagged 10 beachfront homes at Dana Point in September 2026. That is the edge being chewed, not the state sinking.

Stuck, then all at once

Most of the time the fault is stuck. The Pacific Plate keeps moving about 46 mm (1.8 in) a year against North America, and the San Andreas takes about 20 to 35 mm (0.8 to 1.4 in) of that. Near Los Angeles, the fault last broke on January 9, 1857.

Stuck rock bends and stores the motion, then lets it all go at once. That snap is the earthquake. After 1906, the scientist Reid called it elastic rebound. In 1906 the ground near Point Reyes was offset 6 m (20 ft).

The film's Big One follows ShakeOut, a magnitude 7.8 scenario. It is a what if, not a forecast. The break starts by the Salton Sea and runs northwest to near Lake Hughes, more than 320 km (200 miles), shifting the ground over 6 m (20 ft) in places. The aqueducts that water Los Angeles cross the fault 32 times and carry about 88% of its water.

The cow in the crack

The official report on the 1906 earthquake says a cow near Olema fell into the fault crack and the earth closed over her, leaving only the tail. By the time the report's author visited, dogs had eaten the tail. Later a neighbor said the rancher admitted the cow had died first and they put her in the crack. That account is secondhand.

Faults don't gape open. If the two sides pulled apart, nothing would hold them together, and with nothing to grip there is no earthquake. Shallow cracks do form where shaking makes ground slump or slide. Lab tests suggest thrust faults can part for an instant near the surface, but the San Andreas slides sideways.

Key numbers

What the film simplifies

• "An inch or two a year" is a range. The fault itself slips about 20 to 35 mm (0.8 to 1.4 in) a year, and 46 mm (1.8 in) is the whole plate. San Francisco's side also moves northwest, so today the two cities close on each other more slowly than that.
• The 15 million years comes from an older USGS answer that shows no math. The current USGS page only says the two cities will "one day be adjacent".
• "Not an inch since 1857" is stronger than the evidence. We found no report of measurable creep on that stretch, but no source says it is exactly zero.
• The Big One in the film is one scenario, not a prediction. Twenty feet is reached only in places, and in the scenario the rupture ends about two minutes after it starts, so "under two minutes" is close.
• The cow's confession is secondhand: a neighbor's memory of a talk he overheard as a boy. Versions disagree on whether her tail or her feet stuck out.
• California with a face, the slingshot fence, the ghost cow and Los Angeles parked by the Golden Gate are cartoon. The real bending of the ground spreads over many miles and is too slight to see without instruments such as GPS.

At a glance

Runtime 1 minute 6 seconds · Topics: Earthquakes, Plate tectonics, San Andreas Fault · Captions on YouTube · Full script below

Test yourself

1. Why can't California fall into the ocean?

   Answer

   The ocean is not a hole. Its floor is land at a lower elevation with water on top, so there is nowhere for the state to fall.

2. Near Los Angeles the San Andreas has been stuck since 1857. If the fault there slips about 20 to 35 mm a year over the long run, roughly how much motion had built up by 2026?

   Answer

   169 years times 20 to 35 mm is about 3.4 to 5.9 m (11 to 19 ft), if that stretch stayed locked the whole time. An earthquake releases stored motion like that all at once.

3. Why can't a fault open up and swallow a cow during an earthquake?

   Answer

   If the two sides pulled apart, nothing would lock them together, so there would be no friction and no earthquake. Shallow cracks can form where ground slumps or slides, but the fault itself does not gape.

The script

Sources

• California will not fall into the ocean; there is nowhere for it to fall. The Pacific Plate moves northwest about 46 mm a year relative to the North American Plate. Los Angeles and San Francisco will one day be adjacent.USGS, Will California eventually fall into the ocean?
• The ocean is not a great hole into which California can fall; it is land at a somewhat lower elevation with water above it. Los Angeles and San Francisco will be neighbors in about 15 million years.USGS FAQ on California and the ocean, archived 2004
• The San Andreas Fault slips about 20 to 35 mm a year; the Mojave segment last ruptured on January 9, 1857.Southern California Earthquake Data Center, San Andreas Fault
• The ShakeOut scenario: a magnitude 7.8 earthquake starting on the northeast side of the Salton Sea, rupturing more than 200 miles of the southern San Andreas to near Lake Hughes, shifting the ground by more than 20 feet in places, and able to bend or break any aqueduct or other lifeline that crosses the fault. A what if earthquake, not a prediction.Earthquake Country Alliance, the ShakeOut scenario
• In 1906 an offset of 20 feet was observed near Point Reyes.USGS, 1906 earthquake offset
• Elastic rebound: the crust slowly stores strain and releases it suddenly in an earthquake. The fence diagram greatly exaggerates the bending, which really spreads over many miles and is seen only with precise instruments such as GPS.USGS, Reid's elastic rebound theory
• Los Angeles gets 88 percent of its water from three major aqueducts, which cross the San Andreas Fault 32 times.Los Angeles Times via Emergency Management (Govtech), Earthquakes Danger Los Angeles Water Supply, 2014
• The aqueducts are the Los Angeles Aqueduct, the Colorado River Aqueduct and the East and West branches of the California Aqueduct; water from the north cannot reach Los Angeles without crossing the fault.LAist, LA could lose 70 percent of its water
• Faults do not open up during an earthquake; if they did, there would be no friction locking the blocks together and no earthquake. Shallow crevasses can form in landslides, lateral spreads and other ground failures.USGS, Can the ground open up during an earthquake?
• Field geologists have found only small cracks where ground slumped; lab tests at Caltech, checked by calculations in Paris, suggest thrust faults can briefly open near the surface. Mentions the cow story at Olema as lore.UC Berkeley Seismology Lab, The mystery about earthquake fissures, 2017
• The official 1906 report says a cow fell into the fault crack and the earth closed on her so only the tail remained visible, and that dogs had eaten the tail by the time of the visit. The story was later recanted: the cow had died of natural causes.NPR, Retracing the Path of the 1906 Earthquake, 2006
• The rancher's admission comes through a neighbor, H. H. Howard, who overheard it as a boy: the cow had died and they had to bury her.Anne T. Kent California Room, the cow caught in the crack
• Where the San Andreas Fault trace runs.USGS Publications Warehouse, publication 70000052
• In September 2026, coastal erosion and high surf left 10 beachfront homes at Dana Point red tagged (shoreline erosion, not the fault).FOX 11 Los Angeles, Dana Point homes red tagged, 2026

All sources for every film

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