Major Quake Hits ‘Big One’-Threatened Fault Line Close to Iconic U.S. Metropolis
California Earthquake Sparks Fears of Impending "Big One" on Hayward Fault
A 3.2 magnitude earthquake struck Concord, California, near the Hayward Fault, reigniting fears that this seismic zone could trigger the long-dreaded "Big One." The tremor hit at 3:11 p.m. local time, marking the fourth minor quake in the area within 24 hours. Located just 25 miles from San Francisco, Concord sits five miles from the Hayward Fault, a 74-mile fault line scientists warn is overdue for a catastrophic rupture.
The earthquake epicenter near the Hayward Fault has raised concerns about future seismic risks. (Image: USGS)
Why the Hayward Fault Matters
While the San Andreas Fault often dominates earthquake discussions, experts highlight the Hayward Fault as a pressing threat. The last major quake here occurred in 1868, a 6.8 magnitude event that devastated the Bay Area. Historically, this fault has produced significant earthquakes every 140 years. With over 150 years since its last rupture, scientists warn the next "Big One" is imminent.
“The clock is ticking. A major quake is very likely within the next 30 years,” stated researchers from UC Berkeley. The U.S. Geological Survey (USGS) predicts a 7.0 magnitude quake could claim up to 2,500 lives, displace over 250,000 residents, and cause $100 billion in damage.
Simulating Disaster
The USGS’s HayWired Scenario models a 7.0 magnitude quake’s impact: fires, power outages, and infrastructure collapse would cripple the Bay Area. Critical transportation routes, including the Bay Bridge and BART system, could be shut down for months.
Simulations show potential fire and infrastructure damage from a 7.0 magnitude quake. (Image: USGS)
Preparing for the Inevitable
Officials urge residents to secure heavy furniture, create emergency kits, and practice evacuation plans. Strengthened building codes and retrofitting projects aim to mitigate damage, but thousands of older structures remain vulnerable.
While Friday’s quake caused no injuries, it serves as a stark reminder of the looming threat. As USGS seismologist David Schwartz warns, “The question isn’t if the Hayward Fault will rupture—it’s when.”
Stay Informed
For real-time earthquake alerts, download the MyShake app or visit USGS.gov.
Thumbnail image: A collapsed building after a simulated Hayward Fault earthquake. (Image: Shutterstock)
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