According to the USGS scientist, a 180-mile rupture along the southern portion of the state’s San Andreas Fault could produce the “Big One,” a 7.8-magnitude earthquake. He said it would be felt “pretty widely throughout the state” and even as far as Las Vegas but “the worst shaking will be in the Los Angeles basin.”

“We are expecting a very large earthquake on the San Andreas Fault,” de Groot said. “We don’t know when this earthquake will take place, but it’s a very good candidate as a place where a big earthquake will happen eventually.”

A spokesperson for AIR Worldwide told CNBC the catastrophe-modeling firm conducted an earthquake model analysis and found simulated events impacting California could result in “upwards of $300 billion in total ground-up losses to properties.”

An analysis by CoreLogic, a global data analytics firm, specifically looked at a large quake along the San Andreas Fault and in November estimated it could impact the northern and southern portions of California simultaneously. CoreLogic said an earthquake of magnitude 8.3 along the feared fault could result in a full rupture and damage up to 3.5 million homes, resulting in reconstruction cost values of $289 billion.

By comparison, CoreLogic estimated Hurricane Irma and Harvey damage would run in the tens of billions of dollars. Most of the property estimated to be damaged by flood is uninsured.

In California, only about 10 percent of the homeowners have earthquake insurance.

On average, big quakes happen on segments of the San Andreas statewide roughly every 150 years, but parts of the fault system in the south near L.A. have not had a rupture for over 300 years.

For Southern California, a significant quake could damage infrastructure at the ports as well as airports. That could result in a ripple effect not only on the state’s economy but on the nation’s since major retailers, manufacturers and others rely on the L.A.-area ports to stay in business.

Additionally, rail lines that carry the goods from ports, as well as the highways and bridges that the trucks use, could suffer devastating damage in a big quake and take weeks or months to repair.

“We could be up and running here after a major quake and have all of our ships coming in and going, but there could be a problem with rail or highways that doesn’t allow the goods to leave the port or get to the port,” said Phillip Sanfield, a spokesman for the Port of Los Angeles, the nation’s largest port complex.

Parts of the cargo terminals and harbor facilities of the L.A.-area port complex are built on artificial landfills and areas with known seismic activity. As the ports have increased volumes and cargo ship sizes over the years, they have outgrown existing spaces and been forced to create new land.

The shaking on areas with land reclamation increases the liquefaction potential and ground failure when loose or water-saturated soils shake. Indeed, the huge 9.0-magnitude earthquake in Japan in 2011 caused major liquefaction on reclaimed land in Tokyo.

“We’re very cognizant of the fact that we’re in an earthquake-prone region,” said Duane Kenagy, interim deputy executive director of the Port of Long Beach. He said standards have been developed over the years for the engineering and construction of the port facilities that take into consideration the location and seismic risk.

If there was damage from a significant quake to the L.A. port complex, though, they could attempt to move ships to other terminals or even divert vessels to other West Coast ports, such as Oakland.

Other infrastructure also is at risk, and an earthquake could have lasting effects.

There’s the potential for natural gas and water lines to break, which is what happened during the Northridge quake. The broken gas lines could create thousands of fires that could overwhelm emergency responders after a major temblor.

Another frightening possibility is an earthquake could cut off a major water supply for L.A. and other parts of Southern California, where more than 23 million people live. The region gets about 70 percent of its water delivered through three aqueducts that cross the San Andreas Fault, and a study by the L.A. Mayor’s Office several years ago revealed that a 7.8-magnitude quake could cripple that water supply for 15 months.

There’s also concern about the stability of levees in Northern California that form the Sacramento-San Joaquin Delta, the hub of the state water system that provides water to about 25 million Californians and to millions of acres of agriculture in the Central Valley. San Francisco Bay and Silicon Valley areas of the state also could be affected since they draw on that water from the delta.

The Metropolitan Water District of Southern California, a water wholesaler for nearly 19 million people, uses the Colorado River Aqueduct and said it could recover in six months from a disruption if there’s a big quake on the southern portion of the San Andreas fault. Chief Engineer Gordon Johnson said MWD has a reservoir it built in the late 1990s that carries a six-month emergency supply of water for Southern California and there are also groundwater basins to tap into during a water emergency.

Finally, a major earthquake in California could trigger tsunamis and makes heavily populated areas along the coast especially vulnerable. The threat of a tsunami isn’t limited to the southern half of the state since Northern California includes part of the 680-mile long Cascadia fault capable of megaquakes of magnitude 9.0.

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