2024-02-24 Brian Sherrod — High-resolution dating of a multi-fault earthquake and earthquake recurrence in the Salish Lowland

On February 24, 2024, the Quimper Geological Society welcomes USGS geologist, Dr. Brian Sherrod.

Join us (in person) at the First Baptist Church, 1202 Lawrence St, Port Townsend, Washington 98368, 4 pm, doors open at 3:30 pm. The event will also be filmed for viewing afterwards.

THE LECTURE:  High-resolution dating of a multi-fault earthquake and earthquake recurrence in the Salish Lowland

In this presentation, Dr. Brian Sherrod will discuss new evidence for a multi-fault rupture. This rupture occurred along the Seattle (SFZ) and Saddle Mountain (SM) faults in the winter of 923-924 CE. He will also present new evidence for a proto-historic earthquake on the Seattle fault (in the 1830s), and he will talk about recurrence of large earthquakes in the Salish Lowland. He employs photographs, USGS mapping, lidar measurements, charts, and graphs to elaborate his points. Brian is a master story-teller, and his lecture will explain how this important event was detected.

For a complete version of the research paper:  Black, Pearl, et al., 2023, A mulitfault earthquake threat for the Seattle metropolitan region revealed by mass tree mortality:  Science Advances 9, eadh4973, 9 p.


Dr. Brian Sherrod is a Research Geologist and Pacific Northwest Regional Coordinator for the USGS Earthquake Hazards Program, based in the Department of Earth and Space Sciences at the University of Washington.

He received his BS in Geology from James Madison University in Virginia, his MS in Geology from the University of Pittsburg, Pennsylvania, and his PhD in Geological Sciences from the University of Washington. His main area of research is paleo-seismology:  finding evidence of past earthquakes in the Pacific Northwest using geological records. Much of his work uses lidar. His recent projects include looking for evidence of surface rupture along faults in central and western Washington, coastal uplift, and subsidence along faults in the northern Salish Lowland.



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