Kulkarni et al. (2013; hereafter, Kulkarni2013) present a detailed statistical analysis of records of possible repeat great earthquakes on the Cascadia subduction zone, offshore of Vancouver Island, Washington, Oregon, and northern California. The data set they analyze is derived from turbidite cores collected off the Washington, Oregon, and northern California coasts (Goldfinger et al., 2012; hereafter, Goldfinger2012). They conclude that there is a 65% probability that the data are in fact clustered, as previous authors have speculated. This means that the cluster hypothesis does not meet the usual 95% threshold for acceptance of a hypothesis, although...

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