Cascadia Great Earthquakes: Riddle of the Sands
with Chris Goldfinger, PhD, director of Active Tectonics and Seafloor Mapping Laboratory College of Earth, Ocean and Atmospheric Sciences at Oregon State University
Channels carrying earthquake triggered turbidity currents located along the continental margin of Cascadia Basin from Vancouver Island, Canada to Cape Mendocino, California have been investigated to develop a 10,000 year earthquake record along the Cascadia subduction Zone. The turbidites define a great earthquake recurrence of ~500-530 years for the northern Cascadia region, while the southern margin record suggests a shorter recurrence time of ~ 200-250 years. In the next 50 years, time dependent probabilities for northern margins events are ~7-12%, and 37-42% for the southern margin. Even though we have no written records of these great earthquakes, we now know quite a bit about their history, and what we need to do to prepare for the next one.Dr. Chris Goldfinger
is the director of Active Tectonics and Seafloor Mapping Laboratory College of Earth, Ocean and Atmospheric Sciences at Oregon State University. His current research includes gas-hydrate-gas-fluid-sediment dynamics using drilling, high-resolution seismic reflection, sidescan sonar, and submersible observations; active oblique faulting and block rotation in the Cascadia subduction zone; the relationship of forearc deformation to earthquake potential in convergent margins; investigation of the earthquake potential of the Cascadia subduction zone; and super-scale mass wasting and erosion of the southern Oregon margin. He earned a bachelor of arts in geology and a bachelor of sciences in geological oceanography from Humboldt State University; and a master of science and PhD in structural geology from Oregon State University.
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