In ages of landslides in this area. We

In this
study, we used radiocarbon dates to standardize the surface roughness-age
function to calculate how surface roughness of a landslide deposit decreases
over time. We used this method on the area nearby the Oso landslide of 2014 in
western Washington State, the NFSR valley. Many landslides have occurred in
this area due to the sediment remaining from the Cordilleran ice sheet that
moved southward through the region about 17,500 years ago. We used radiocarbon
dating to calibrate surface roughness to assess the age of the landslides in
the area. Then, we calculated the surface roughness for the landslide deposits
by using the standard deviation of slope within a 15 x 15m travelling window.

The average standard deviation of slope was plotted against four of the
absolute ages of landslides in this area.  We acquired results in three categories:
landslide mapping, 14C dating, and calibrated surface roughness
dating. We found that landslides in this area have a significant amount of
mobility, and that radiocarbon dating had agreed with previous tests of similar
samples. We also found that plotting the standard deviation of slope against
the age of the dated landslides is best fitted by an exponential decay
function, allowing us to estimate the ages of landslides in the area. Through
this study, we concluded that the NFSR valley is an unpredictable landscape,
with ongoing glacial sediment removal through landslides, ad averages 1 event
per 140 years due to slope failures and young landslides.

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