The San Jacinto fault, a twitchy system that cuts through the East County, could produce larger earthquakes than scientists believed and may rival the San Andreas in power, according to research led by San Diego State University. 
 
 "A magnitude 7.5 was generally accepted to be the largest earthquake that would like occur on the fault," said Tom Rockwell, an SDSU seismologist and the study's leader. "We have shown that the central and northern sections of the San Jacinto fault appear to fail together at times, and that would be in the magnitude 7.6 to 7.7 range. 
 
 SDSU's Tom Rockwell is one of the world's foremost authorities on the San Jacinto fault. — Gary Robbins Share Photo  
 
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 ✉ SDSU's Tom Rockwell is one of the world's foremost authorities on the San Jacinto fault. — Gary Robbins 
 
 "If it ruptures onto the San Andreas fault, it could approach a magnitude 8.0, although we don't see evidence that that has happened in the past couple of thousand years. The take home here is that earthquakes on the San Jacinto fault potentially rival those on the San Andreas fault." 
 
 The San Jacinto system is a 130-mile strike-slip fault that stretches from Imperial County through Anza, Ocotillo Wells and Borrego Springs into Riverside County and the San Bernardino Valley. Rockwell oversaw field studies that examined 21 seismic events that have occurred on the fault over the past 4,000 years. The study, recently published in the journal Pure and Applied Geophysics, was centered at Hog Lake, a spot near Anza. 
 
 The San Jacinto is part of the larger San Andreas fault, the dividing line between the Pacific and North American plates. Scientists say that the two faults are responsible for roughly 80 percent of the slippage along the plates. Rockwell has played a major role in revealing the path of the San Jacinto and reconstructing its history. Records show that the fault produced a magnitude 6.5 quake in April 1968. A different strand of the fault, known as Superstition Hills, produced a 6.7 quake in November 1987 that was strongly felt in San Diego. 
 
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– Here's an unfortunate hypothetical: An earthquake strikes along the San Andreas fault, damaging three aqueducts that cross it some 32 times. Those aqueducts supply Los Angeles with all but 12% of its water—meaning a serious quake could ultimately leave 22 million people without water. (There would be about six month's worth of water stored on the LA side of the fault, but fixing busted aqueducts could take more than twice that long.) Officials have been aware of the potential for a single quake to hit all three aqueducts since 2008, but as the Los Angeles Times reports, they're now moving to do something about it for the first time. But any solution is pretty far off, in terms of time and money—in terms of the latter, the LAT uses the word "billions." None of the aqueducts has yet had to deal with the scenario; the last huge quake (magnitude 7.9) along the fault was in 1857. The Los Angeles aqueduct travels across the fault under a mountain, by way of the five-mile-long concrete Elizabeth Tunnel. Building a brand new tunnel is the priciest option; sending water over the mountains via an electric pumping mechanism is another idea. In the case of the Colorado River Aqueduct, a quake could raise a section of the pipe by 13 feet, and there aren't any pumps in place to ferry the water to LA. The mayor last week requested that proposals on the issue be submitted by July. Meanwhile, the San Diego Union-Tribune reports that there may be another fault to fear: It points to new research that shows the San Jacinto fault could generate an earthquake as powerful as what the San Andreas fault is capable of.