Tree rings also hold records of earthquakes. Near Seattle, the Lab used trees killed in a landslide and fallen logs discovered in a nearby lake to confirm that a mega earthquake shook the Pacific Northwest in 1699-1700 and generated a tsunami, likely the “orphan tsunami” that reached Japan in 1700. Photo courtesy of Gordon Jacoby
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AGU25, the premier Earth and space science conference, takes place December 15-19, 2025 in New Orleans, Louisiana. This year’s theme—Where Science Connects Us—puts in focus how science depends on connection, from the lab to the field to the ballot box. Once again, Lamont-Doherty Earth Observatory and Columbia Climate School scientists, experts, students, and educators are playing an active role, sharing our research and helping shape the future of our planet. #AGU25 Learn More