Residents throughout western Washington are scratching their heads on why they didn’t receive a phone alert after an earthquake struck the region Sunday night.
“At first, it felt like there was a big truck coming down the hill.” She added, “I heard a boom. A buh buh buh boom.”
When an earthquake strikes an area, the system is notified and sends out information and details to third-party vendors, who then notify people through their cell phones. Robert de Groot said Sunday’s earthquake was 35 miles deep and took about 9.5 seconds to reach the surface.De Groot told us the ShakeAlert system had estimated the earthquake at 4.2, while members of the USGS made their initial estimate at 4.5 while using other data. However, the earthquake’s official measurement was recorded at 4.3, he said.
“We wouldn’t want to alert people too frequently because eventually people would get tired of it. There’s a fatigue factor. There’s also this thing, ‘Oh I’m getting an alert, nothing happened last time so maybe I don’t need to do anything.’ We really want people to take protective action if they feel shaking or if they get that alert on their phone,” he said.
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