Author: QMPGEOeditor3

2024-03-23 Brian Sherrod — New Findings on Earthquakes of Salish Lowland with Tree Analysis

QMPGEOeditor3

We enjoyed hearing in-person USGS geologist, Dr. Brian Sherrod, on February 24, 2024 and by Zoom March 23.

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

See Sept. 2023 Science Advances article: https://www.science.org/doi/10.1126/sciadv.adh4973

Dr. Brian Sherrod discusses 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 presents new evidence for a proto-historic earthquake on the Seattle fault (in the 1830s), and he talks 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, Sept. 2023

THE SPEAKER:

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.

 

 

2023-7-8 Tamanowas and Peregrine Rocks field guidebook (Download here)

QMPGEOeditor3

For the Tamanowas and Peregrine Rocks field trip, use the link below to download the guidebook (slightly revised from 2022 version).  Please print a copy for your use on the trip: the figures and photographs will be particularly useful.  Thanks All.  Dee Norlin, registrar.

Click here:  Final Tamanowas Rock guidebook

If you have technical or logistical questions, contact Michael Machette <paleoseis@gmail.com>

2021-Fall: Geology of bluff along North Beach, Fort Worden (updated 2023)

QMPGEOeditor3

GEOLOGIC GUIDE TO BLUFF ALONG NORTH BEACH FORT WORDEN

Guide to the Geology of the Bluff along North Beach, Fort Worden

Have you ever looked up at the bluffs while walking along the beach at Fort Worden and wondered how the layers formed?  If so, you’ll want to use this self-guided tour of the North Beach bluff from Fort Worden to North Beach parking lot to learn about what you see.

This long-version of our recent guides describe the geology along a one mile stretch of the north shore, extending westward from Point Wilson at Fort Worden State Park. The walk is less than a mile one way.

The geologic interpretations will provide you with a concise understanding of these beautiful Pleistocene glacial deposits… Have fun and save your questions for the next Quimper Geological Society talks.