How do scientists learn about important past earthquakes? Sometimes tree stumps tell tales, recording stresses caused by shaking. USGS scientists continue to pursue this line of research, in collaboration with external partners.
A team of researchers from the USGS and a university partner collected slices from 23 redwood tree stumps along the north coast section of the San Andreas Fault near Gualala, California in late August 2022.
The tree stumps were several hundred years old when they were cut down in the late 19th and early 20th centuries. Their rings store their growth histories and possibly the effects of earthquakes prior to theThe team, including Belle Philibosian, Nick Cunetta, and Austin Elliott, researchers with the USGS Earthquake Science Center, and Allyson Carroll, a researcher at Cal Poly Humboldt, plan to analyze the tree ring records at Humboldt.
Here’s a pictorial tour of their fieldwork, from climbing massive tree stumps to observing sawyers cutting into the stumps to preparing the stump slices for analyses.Belle Philibosian with the USGS Earthquake Science Center examines a redwood stump along the north coast section of the San Andreas Fault near Gualala, California in late August 2022.Belle Philibosian, Nick Cunetta, and Allyson Carroll watch sawyers cutting into a leaning redwood snag.
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