The earthquake early warning system has been upgraded in Oregon, Washington and California

The earthquake early warning system operating on the West Coast recently received a major upgrade. ShakeAlert now uses satellite technology to detect seismic activity.

A new type of global positioning system (GPS), somewhat similar to what we use to navigate, is now part of the system, said Diego Melgar, an assistant professor of geophysics at the University of Oregon.

“The reason it's really important is because it helps with really big events,” he said. “So, for 8- and 9-second intensities, GPS really shines. It's the technology you want to have. Because if you don't have it, if you just have the standard seismic sensors that we've been using for the last few years, it might It can be really hard to distinguish between a big earthquake and a really big earthquake.

The GPS technology is really accurate, Melgar said. He said in Japan in 2011 there was an earthquake with a magnitude of 9.

“Japan’s earthquake early warning system, the most advanced in the world at the time, thought the quake was only magnitude 8,” Melgar said. “If it is magnitude 9 and you think it is magnitude 8, you will issue alerts to insufficient numbers of people, and the alerts will not spread widely. The tsunami warning may not be as widespread as necessary.”

ShakeAlert sends a message to smartphones on the same system that Amber Alert uses. People can also download ShakeAlert apps for their phones.

The amount of time ShakeAlert provides warning before an earthquake strikes depends on how close you are to the epicenter, Melgar said.

ShakAlert has been fully operational in Oregon, Washington, and California since 2021.

It has not yet been activated in Oregon because the state has not yet experienced an earthquake large enough to trigger it.

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