Hawaii
University of Hawaii study finds San Andreas Fault stress at 1,000-year high | Honolulu Star-Advertiser
LOS ANGELES >> Stress on the San Andreas Fault system has reached a 1,000-year high, according to new research from the University of Hawaii.
Higher stress on a fault means the pressure that causes earthquakes is building.
“Our results show that stress levels on multiple fault segments are now at or above the highest values seen in the past millennium and that the region may be capable of a large through-going rupture involving both fault systems,” said lead author Liliane Burkhard, research affiliate in the Hawai‘i Institute of Geophysics and Planetology at the UH-Manoa School of Ocean and Earth Science and Technology and a scientist at the University of Bern, Switzerland.
“We also found that Cajon Pass may act as an ‘earthquake gate:’ sometimes blocking large ruptures from crossing between the faults, and sometimes allowing them to pass through and involve both systems in a single event,” Burkhard said in a UH news release.
Multi-fault ruptures, where earthquakes continue from one fault to another, have occurred in multiple recent earthquakes, including the 2011 Tohoku, Japan, earthquake and became a part of the U.S. Geological Survey’s earthquake forecasting model in 2015.
This type of quake would be possible if the Cajon Pass, which is between the San Bernardino and San Gabriel mountains in Southern California, allows an earthquake to pass through it, meaning rather than affecting the area along one fault line, a quake could continue along a second fault and affect a larger area.
Don’t miss out on what’s happening!
Stay in touch with breaking news, as it happens, conveniently in your email inbox. It’s FREE!
But Kate Scharer, a co-author of the study and a seismologist with the U.S. Geological Survey in Pasadena, said there’s no reason for California residents to be significantly more concerned than they were before hearing about the study.
While the stress has reached a milestone, the pressure was already high and the fault has been overdue for a large earthquake for some time, according to the study.
It has been over 100 years since a major tectonic rupture has affected the greater Los Angeles area, which means stress on the tectonic plates has been building, according to the study.
The 1857 Fort Tejon earthquake was the most recent “big one” to affect Southern California, while the San Jacinto Fault saw moderate earthquakes in 1918, 1968 and 1987, according to the study. A long period without seismic activity “raised concern that the next slip event in this region could be both large and complex,” the study says.
As more time passes, an earthquake becomes more likely because built-up energy needs to be released.
“We know for the southern San Andreas and the San Jacinto fault that they were just a little bit over the average (time between earthquakes) from looking at the geologic record,” Scharer said.
Those two faults are at highest risk for an earthquake because they are the fastest moving, she said.
The study looked at a geologic record of earthquake activity across the past 1,000 years, giving a new perspective on the total stress the San Andreas and San Jacinto fault systems are under. Tectonic plates are always moving and accumulating stress, save for those few seconds where an earthquake is happening.
When an earthquake releases built-up stress from hundreds to thousands of years of an interseismic period, energy is felt in the form of an earthquake, Scharer said.
Earthquake forecast models from the U.S. Geological Survey are “a reminder that damaging earthquakes are inevitable for California,” and the new study highlights just how much stress the fault systems are under as Californians prepare for the “big one,” according to the USGS.
The study’s importance is with the calculations of stress the researchers did. After a geologic record, which looks at prehistoric earthquakes and is assembled by digging trenches across faults and looking at layers that have been offset in the past, is created, the researchers were able to determine that the stress on the San Andreas fault is at a 1,000-year high.
The stress level could influence if the Cajon Pass facilitates an earthquake spreading from one fault to another, or if it stops an earthquake from doing so. When the stress levels on both faults are similar, both faults appear to rupture jointly, according to the study.
Using a physics-based computer model, the researchers found that that the stress that would normally be released in large earthquakes has continued to accumulate and is at unprecedented levels.
The Cajon Pass, the study suggests, could facilitate a joint rupture of both the San Andreas and San Jacinto faults simultaneously, which could be “significantly more damaging than a single-fault event,” affecting densely populated areas including Los Angeles, San Bernardino, Riverside and the Coachella Valley, according to the UH news release.
“This is not a prediction of when an earthquake will happen,” Burkhard said. “However, studies like this are important contributions to national and global earthquake hazard research in that we are using rigorous, quantitative science to better understand the risk facing millions of people. What we can say is that the system is critically stressed, and that physics-based models like this one give us a clearer picture of the range of scenarios we should be prepared for. That information matters for hazard assessments, infrastructure planning, and emergency preparedness.”
Honolulu Star-Advertiser staff contributed to this report.
Hawaii
Traffic fatalities in Hawaii ticked up after Memorial Day – The Garden Island
Hawaii
New Honolulu police chief plans to launch drone program to help catch crime
HONOLULU (HawaiiNewsNow) – The new Honolulu Police Department chief said he’s launching a new initiative to send drones to potential crime scenes before police arrive.
Honolulu Police Chief David Lazar said the Department of Law Enforcement is helping the department get the required equipment and personnel.
Officers would deploy a drone to a location to let them know what to expect.
Officials said this could tell them whether a suspect is still there or if evidence is recoverable.
HPD Chief Lazar said, “Our officers need the tools that they need to do the work and to make their work efficient and to capture those that are involved in crime.”
Lazar says HPD will start using the drones in August throughout Honolulu.
The Honolulu Police Department has used drones in the past to combat against illegl fireworks on the island.
PREVIOUS COVERAGE:
Copyright 2026 Hawaii News Now. All rights reserved.
Hawaii
Records were set for June rainfall – Hawaii Tribune-Herald
-
World4 minutes agoLeaked Iran report finds record public anger as regime focuses on holding power
-
Politics10 minutes agoWhite House dishes out new election security jab over Olive Garden’s pasta pass ID policy
-
Health16 minutes agoDoctors warn your ‘stomach bug’ may actually be a parasite that’s harder to detect
-
Sports22 minutes agoAEW star Kenny Omega blasts social media user over Charlie Kirk comment
-
Technology28 minutes agoNew bank scam laws could stop suspicious payments
-
Business34 minutes agoEnvironmental groups press to halt Imperial Valley lithium venture
-
Entertainment40 minutes agoNetflix stock plunges to 52-week low following mixed earnings report
-
Lifestyle45 minutes agoL.A. Affairs: After losing our spouses, we found love again. But were we cheating on our children?