Caption: This Google Earth image shows a site about 5 miles south of Florence, on the central Oregon coast, that had a landslide in winter 2017. The new paper uses aerial imagery that penetrates through tree cover to study the occurrence of such slides over more than 1,000 years.
Researchers at the University of Washington, Portland State University and the University of Oregon have shown that deep-seated landslides in the central Oregon Coast Range are triggered mostly by rainfall, not by large offshore earthquakes.
The open-access paper was published Sept. 16 in Science Advances.
“Geomorphologists have long understood the importance of rainfall in triggering landslides, and our study is simply driving home just how important it is,” said first...