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Fault2SHA Learning Series – Turbidite Palaeoseismology by Chris Goldfinger
14/11/2022 @ 4:00 PM - 5:00 PM
Turbidite Palaeoseismology – Bringing together Onshore and Offshore palaeoseismology – The Next Great Cascadia Earthquake: How Did We get here?
Professor Emeritus, College of Earth, Ocean, and Atmospheric Sciences, Oregon State University
Monday 14th November 2022 16:00 CET (15:00 UK, 16:00 Italy/France)
Cascadia has served as an incubator for off-fault paleoseismic methods for several decades. Lacking instrumental or historical evidence, Cascadia shares many characteristics of seismically active subduction zones, yet remains the quietest by an order of magnitude, something that remains unexplained. Coastal and sub-aqueous paleoseismology however have revealed a rich history of great earthquakes extending back to the late deglacial, the present limit of existing data. Tehonshore and offshore records are for the most part quite consistent leading to a strong consensus about the past and future earthquake potential of Cascadia. Recently, geologic evidence has suggested a temporal and possible stress linkage between Cascadia and the Northern San Andreas fault for the past ~ 4000 years, raising the possibility of major evens on both faults within a short time span. Unlike Japan, Cascadia is at a nascent state of resiliency, with thousands of unreinforced structures and bridges, and a low level of societal preparedness, leaving the region in a fragile state for a near-term earthquake and tsunami.