Scientists warn that California should prepare for the devastating “Supershear” earthquakes

A section of the highway in southern California is located in the ruins after a large earthquake. Credit: USGs.

Most California residents are familiar with earthquakes. But researchers say that the state is facing a threat that has been ignored: “Supershear”, which moves very quickly that it excels in its seismic waves.

In an opinion article published in Seismic Research Messages, scientists at the Usc Dornsife College warns scientists that these earthquakes produce more violent vibration on larger areas of model earthquakes, and California must update risk planning and building them to reflect the risk of increased damage.

“While California is unlikely to have severe earthquakes from other similar regions that have large cracking systems such as San Andreas, the threat has not been noticed for a long time,” said Judea Bin Zion, a professor of Earth Sciences and California Earthquake Center (SCEC), based in Osx, based at the Ovores. “The frequency of the tear of this Supershear was largely not prohibited.”

Scientists compare supershear to lift. Ahmed Elbana, a professor of Earth Sciences and his manager at SCEC, said, just as the sounding barrier crash creates an explosive shock in the air, the rupture of the breaks generates shock fronts on the ground when it exceeds the seismic waves. “It breaks the speed of the shear wave speed in rocks and produces stronger devastating waves than a natural earthquake,” he said.

That added force can hit societies hard. Strong Supershear earthquakes vibrate farthest and hand over what Elbanna call “double blow” – a preliminary tremor from the shock front, followed by excess waves.

Throughout the world, about a third of the large strike earthquakes are Supershear. This is important in California, where many defects near large urban areas are the sliding of the strike and capable of 7 or higher.

“We cannot say exactly when and where the next earthquake will be and whatever it will be one of the columns,” Ben Azion said.

“They come, whether we are ready or not.”

The authors warn that current design criteria are not fully explained by an additional zipper punch. Buildings and infrastructure are generally designed for the strongest vertical vibration of errors, but the Supershear earthquake directs their energy along the rift line itself.

Bin Zion said: “The critical structures of this higher standard must be built, and yet it is not.”

To prepare, the team calls to monitor the density near the main errors, simulate the advanced computer for Supershear, and the strongest construction symbols.

“This is a cooperative effort where everyone should rise,” said Albana. “I think here at USC and SCEC, with its reputation in society, this is the right time and place to start this effort.”

Elbanna and Ben-Zion participated in writing an article opinion with Caltech researchers and the University of Illinois Champin.

More information: Ahmed Elbanna et al, Supershear earthquakes: its occurrence and importance of seismic risks, early warning, design and seismic research messages (2025). Doi: 10.1785/0220250118

Introduction from the University of Southern California

Quote: Scientists warn that California should prepare for the devastating “Supershear” earthquakes (2025, September 24) was retrieved on September 24, 2025 from https://phys.org/news/2025-09-Scientists-california-dergorshear-atarthquakes.html

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