A leading seismologist has warned that a major earthquake capable of wreaking havoc across the globe is almost a certainty in California, as “the Big One” is likely to happen any day now.
Professor James Dolan from the University of Southern California has said within the next few decades California is due to release a huge amount of “pent up energy” is has stored in the rocks underground.
“At some point, we will need to start releasing all of this pent-up energy stored in the rocks in a series of large earthquakes,” Dolan stressed.
The earthquake could spark a “super cycle,” meaning “a flurry of other Big Ones, as stresses related to the original San Andreas fault earthquake are redistributed on other faults throughout Southern California,” he said.
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While there would not be a literal cannonade of destruction, the earthquakes could come just decades apart, like, for example, the 7.5 major quake in 1812 on the San Andreas fault, followed by a 7.7 in 1857.
Incidentally, that was the last major earthquake in that system, one of the factors that led the US Geological Survey to conclude last month that there is a 7 percent chance of an earthquake measuring 8.0 or greater on the Richter scale to occur in California in the next 30 years alone.
Scientists behind the March report said that the fault lines in California – which is home to almost 40 million people – are much more interconnected than previously thought, and similarly claimed that “tectonic forces are continually tightening the springs of the San Andreas fault system, making big quakes inevitable.”
Dolan made his discovery while studying the Garlock fault line ‒ state’s second-biggest. He said the Garlock was “switched off” for 3,500 years before creating four major earthquakes from 250 AD to 1550. During that period, the fault lines were moving four times as fast, as during the pause.
“We’re not focused especially on the seismic threat posed by the Garlock,” said Dolan.
“This study focuses on the deeper scientific significance, the more general importance of how faults interact with one another over long time and distance scales, and fundamentally on helping us to understand how faults store and release energy,” he added. “These are issues of absolutely basic importance for our understanding of seismic threats from all faults.”
The most destructive recent earthquake in California was the Northridge in 1994, which caused more than 50 deaths and $20 billion worth of damage despite its modest magnitude of 6.7.
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