Quimper Geological Society

The Lecture:  An Exhumed Ancient Cascadia Megathrust Fault in the Olympic Mountains On October 5, 2024 the Quimper Geological Society will host a lecture by Harold Tobin, professor of Seismology and Geohazards at the University of Washington and Director of the Pacific Northwest Seismic Network. Harold’s research employs field mapping and geophysical techniques to investigate processes that operate in fault zones, particularly those associated with subduction zones. One of his study areas is the Olympic Mountains, where recently he and his graduate students mapped rocks in a remote area west of Mount Olympus that were covered by ice when geologists… Read more2024-10-05 Harold Tobin – An Exhumed Ancient Cascadia Megathrust Fault in the Olympic Mountains

The Lecture: What Happens When You Crash Iceland into North America? A view of Washington 50 million years ago… The Puget Lowland of Washington State contains several potentially dangerous seismic faults, including the Seattle fault, which runs south of downtown Seattle. To accurately assess the earthquake hazard in this region, we need to understand the architecture and geologic history of the rocks that host these faults, deep below the Puget Lowland. Geologists do this by using small changes in Earth’s gravity and magnetic fields to create images of the Earth’s subsurface. These rocks formed in a subduction zone 50 million years… Read more2024-11-16 Megan Anderson – Siletzia’s influence on the Seattle Fault