In northern California, geologists are exploring a previously unknown fault. They suspect this fault remains active, raising concerns about potential earthquakes, especially following a significant earthquake that recently occurred in the region.
The Humboldt County Fault is currently being excavated for research purposes.
Mark Hemphill Haley, a professor emeritus of geology at Cal Poly Humboldt, expressed their confidence in the findings. “We had a strong belief in its importance, but we needed to dig deeper to confirm,” he noted. During the excavation, they identified it as a well-defined reverse fault.
Jason Patton, a geologist with the California Geological Survey, first detected indications of this fault in the Sibley area about four years ago. He utilized a remote sensing technique called lidar to analyze the surface of the Earth and identify faults.
After discovering the fault, Patton and Hemphill-Haley decided to conduct further excavation, believing it was still active based on four significant earthquakes that occurred in the last 20,000 years.
With support from the U.S. Geological Survey, the research team has dug a trench measuring 30 feet wide and 15 feet deep, collecting vital data from it.
Just as the team was investigating, a 5.6-magnitude earthquake hit nearby Mendocino County, resulting in injuries and damage to several businesses.
The Sibley fault, however, poses a risk of far more severe earthquakes.
The team estimates that it could produce an earthquake of magnitude 7, which is over 100 times more intense than the recent quake in Mendocino. California has only experienced approximately 15 earthquakes of magnitude 7.0 or greater in the last century, as noted by scientists, who aim to gather more data in preparation for future events.
Concerns are already rising about the Pacific Ring of Fire, which stretches from South America to Australia, potentially exacerbating the chances of destructive earthquakes.
In Venezuela, for instance, earthquakes with magnitudes of 7.2 and 7.5 caused widespread devastation. The U.S. Geological Survey has calculated a 40% chance that such earthquakes could lead to a death toll of at least 10,000, with a 30% chance that it could exceed 100,000.
The USGS has warned that multiple casualties and extensive damage are likely, indicating a potential widespread disaster.
The California Post has contacted geologists for additional insights.
