Quakes in Slo-Mo

Barely detectable tremors may portend major destruction

By Alexandra Witze, 12:15 PM March 7, 2013

Herb Dragert didn’t know what to make of his wayward station.

In the early days of GPS satellites, Dragert had set up four benchmarks in the bedrock of Vancouver Island, British Columbia, to watch how their positions changed over time. Maybe, he thought, he could capture the ground moving during the earthquakes that occasionally shake the Pacific Northwest.

But instead Dragert saw one of his stations, at Albert Head on the southern part of the island, throwing a slow-motion tantrum. Every ...

Source URL: https://www.sciencenews.org/article/quakes-slo-mo?mode=magazine&context=4548