The ruptures of limited extent support the continued inclusion of magnitude-8 earthquakes, with longer ruptures near magnitude 9, in assessments of seismic hazard in the region. The closely spaced ruptures about 1.6 ka may illustrate a pattern common at subduction zones of a long gap ending with a great earthquake rupturing much of the subduction zone, shortly followed by a rupture of more limited extent. This study, prepared by geologists within the Washington Geological Survey division of DNR, was conducted to help. But the range in the times between earthquakes is large: two instances may be ∼50 yr, whereas the longest are ∼550 and ∼850 yr. The Washington State Department of Natural Resources (DNR) has released a new study showing, for the first time, the impacts that a magnitude 9.0 earthquake on the Cascadia subduction zone would have on Puget Sound communities. There’s a one-in-10 chance that the next. If so, post-3-ka recurrence for ruptures extending throughout central and southern Cascadia is 510–540 yr. Seven times in the past 3,500 years, the CSZ has buckled and fractured to produce an earthquake so massive that it left a mark in the geologic record. A new onshore-offshore seismic dataset from the Cascadia subduction zone was. But correlations suggest that ruptures at ∼1.5 ka and ∼1.1 ka were of limited extent (<400 km). The thermal modeling approach is limited by a lack of information about the. For the past 6700 yr, recurrence for all earthquakes is 370–420 yr. We reconstruct a history that accounts for all dated stratigraphic evidence with the fewest possible ruptures by evaluating the sequence of age models for earthquake or tsunami contacts at each site, comparing the degree of temporal overlap of correlated site age models, considering evidence for closely spaced earthquakes at four sites, and hypothesizing only maximum-length megathrust ruptures. The history is based on along-strike correlations of Bayesian age models derived from evaluation of 554 radiocarbon ages that date earthquake evidence at 14 coastal sites. Due to the enhanced vigilance of the New Cascadia ABS controller, some fault codes and indicator lights do not necessarily require immediate maintenance attention. A new history of great earthquakes (and their tsunamis) for the central and southern Cascadia subduction zone shows more frequent (17 in the past 6700 yr) megathrust ruptures than previous coastal chronologies. General Information NOTE: New Cascadia vehicles and the rst generation Cascadias have entirely different ABS architecture.
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