To Los Angeles fault could produce 7.3 natural disaster

To Los Angeles fault could produce 7.3 natural disaster

Ryan Porter, an assistant professor of geology at Northern Arizona University is available to discuss these findings and what this discovery could mean for quake activity in southern California.

But, those found in the Newport-Inglewood/Rose Canyon (NIRC) fault are just two kilometers (1.24 miles) wide or less - meaning it's possible that all offshore segments could rupture at once. Additionally, the yellow boxes highlight the three stepovers within the fault zone.

The northern end of the fault system had three to five ruptures over the last 11,000 years while the southern end appears to have had a tremor that occurred about 400 years ago and another one that happened 5,000 years before that.

In the first study, the fault line is mostly offshore but never more than four miles from the San Diego, Orange County, and Los Angeles County coast, said study lead author Valerie Sahakian, formerly of the Scripps Institution of Oceanography and now with the U.S. Geological Survey.

A 7.4 natural disaster would be significantly bigger than any recent quake to hit the region.

There's also concern about the on-shore section of the Rose Canyon fault.

They identified four segments of the strike-slip fault that are broken up by what geoscientists call stepovers, points where the fault is horizontally offset.

This Temblor figure shows the Southern California coastline both with and without faults.

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The Newport/Rose fault runs offshore between San Diego Bay and Newport Beach.

Seismologists in California have discovered evidence of a new fault line that runs along the eastern edge of the inland Salton Sea, parallel to the infamous San Andreas fault (SSAF), according to research published this week.

The 1933 Long Beach quake occurred on the Newport-Inglewood fault with a magnitude of 6.4 that resulted in 120 deaths.

Even a high magnitude-5 to a low magnitude-6 quake "can still have a major impact on those regions, which are some of the most densely populated in California", she said.

"Longer gaps have happened in the past, but we know they always do culminate in a large natural disaster".

"One of the reasons why this location is of importance is because in Southern California, the Big Bend, Carrizo, and Mojave sections of the San Andreas Fault accommodate 50-70% of plate motion".

Researchers at the Nevada Seismological Laboratory assisted with the study, which was funded by Southern California Edison.

If the southern onshore segment of the fault system ruptured at the same time, it could trigger a magnitude 7.4 quake.