How a 'big earthquake' near Seattle could trigger an earthquake in San Francisco

Today, the area is a seismology hotspot, and its possible connection to the nearby city of San Andreas is an open question.

Seafloor sediments may reveal excitement

The idea of ​​linking the Cascadia and San Andreas earthquake zones goes back to the 1990s, when a researcher suggested that layers of seafloor sediments called turbidites recorded a series of West Coast earthquakes.

Underwater landslides are caused by turbidities, which can occur randomly but are often caused by earthquakes and storms. An underwater landslide causes mud and sand to flow like a river for tens to hundreds of kilometers along the sea floor. Over time, these and other deposits accumulate. Seafloor core samples can reveal the history of turbidities.

Goldfinger didn't buy it at first, and in the late 1990s, he began working to refute the idea. “I was very skeptical about the whole story,” he recalls. But as his team collected more cores and found more turbidites, he soon became convinced that earthquakes were actually the best explanation.

He continued collecting samples and focused research on the turbidites that continued to appear in pairs off the beaches of Oregon and northern California. His new paper presents more cores, 3D scans of turbidities, additional age constraints apart from radiocarbon dating, and analyzes of seafloor structure. Hundreds of cores cover more than 2,500 years of sediment deposition off the West Coast.

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