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Goldfinger et al. (2008) primarily relate the paleoseismic histories of the Cascadia subduction zone and northern San Andreas fault (NSAF), which is why we chose to publish the work in BSSA . The evidence for paleoseismic triggering of turbidity currents in both Cascadia and along the NSAF has been published previously (Adams, 1990; Goldfinger et al. , 2003, 2007). Shanmugam (2009) has commented on a variety of sedimentological issues, many of which would be of interest to the sedimentology and sediment dynamics communities but are out of place in BSSA . We focus our reply only on those comments that have a bearing on the paleoseismic investigation in Goldfinger et al. (2008), specifically, (1) turbidite triggering mechanisms, (2) sedimentological concepts and criteria, and (3) correlation methodologies. Shanmugam (2009) suggests that we selectively used particular datasets to establish seismicity as the principal triggering mechanism for the Cascadia turbidites, but then fails to mention what other datasets we missed. To the contrary, we have ferreted out every core taken on the Cascadia margin and other relevant data to the best of our ability. It was archive cores collected by Oregon State University (OSU) in the 1960s that led to the initial article attributing them to earthquakes (Adams, 1990). Many of these cores exist in the OSU Core Facility, along with the majority of cores collected in the Pacific Northwest, so this was straightforward. Not all of them are included in the article because our more recent larger diameter cores largely superseded the older data, but many more are included in an upcoming article (Goldfinger et al. , 2009). These additional data strengthen the Cascadia earthquake story. We know of no other cores or relevant data, but we are always looking for additional information and welcome suggestions. As far as the treatment of the various possible triggering … |
