10,000 Years

There have been 46 magnitude 8 and 9 CSZ earthquakes on the CSZ over the past 10,269 years. Here are the earthquake names, ages, dates, magnitudes, and rupture lengths and widths. Segments are also listed. For more information about segments, click here.

Magnitudes for T6b (8.13) & T19 (8.92) are my estimates based on averages. Here are the calculations.

Mag Estimate for T6b 8.13.JPG
Mag Estimate for T19 8.92.JPG

If I am able to get more info on Segment E, I’ll update this page. As always, if you find an error or have questions, please let me know. I strive to make this as complete and accurate as possible.

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Megathrust EarthquakesTsunamisHow Big Will it Be?
How Big is The Fault?CSZ Frequency10,000 Years
When Will it Happen?37% in 50 Years17% in 50 Years
Summer EarthquakesThe True RiskWorst Case Scenario
Expected Regional ImpactsWhy PrepareDrop, Cover, Hold?
Water PreparednessFood PreparednessSanitation… & Whales
Life Without ElectricitySlow-Slip Events (ETS)Offshore Earthquakes
ResourcesCERT SalemWest Salem CERT
Research PapersBook RecommendationsContact


Goldfinger, C., Nelson, C.H., Morey, A., Johnson, J.E., Gutierrez-Pastor, J., Eriksson, A.T., Karabanov, E., Patton, J., Gracia, E., Enkin, R., Dallimore, A., Dunhill, G., and Vallier, T., 2012, Turbidite Event History: Methods and Implications for Holocene Paleoseismicity of the Cascadia Subduction Zone, USGS Professional Paper 1661-F, Reston, VA, U.S. Geological Survey, p. 184 p, 64 Figures. http://pubs.usgs.gov/pp/pp1661f/ 

Goldfinger, C., Galer, S., Beeson, J.W., Hamilton, T.S, Black, B., Romsos, C., Patton, J., Nelson, C.H., Hausmann, R., Morey,A., 2017, The Importance of Site Selection, Sediment Supply, and Hydrodynamics: A Case Study of Submarine Paleoseismology on the Northern Cascadia margin, Washington USA, Marine Geology, v. 384, p. 4-46.