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Comment on “Holocene mass movements in west and mid-Norwegian fjords and lakes” by B. Bellwald, BO Hjelstuen, HP Sejrup, T. Stokowy and J. Kuvås [Marine Geology 407 (2019) 192–212]
Van Daele, M. (2019). Comment on “Holocene mass movements in west and mid-Norwegian fjords and lakes” by B. Bellwald, BO Hjelstuen, HP Sejrup, T. Stokowy and J. Kuvås [Marine Geology 407 (2019) 192–212]. Mar. Geol. 412: 220-223. https://dx.doi.org/10.1016/j.margeo.2019.04.006
In: Marine Geology. Elsevier: Amsterdam. ISSN 0025-3227; e-ISSN 1872-6151
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| Trefwoord |
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| Author keywords |
Frequency curve; Time-series analysis; Mass-transport deposit; Fjord;Lake |
| Abstract |
In their paper, Bellwald et al. (2019) present a frequency curve of mass movements from a total of 22 fjords and 6 lakes in west and mid-Norway. However, the time-series analysis that is used to create this frequency curve is somewhat flawed, as mass-transport deposits (MTDs) receive a weight that is positively correlated to their age uncertainty, instead of an equal weight. Here, I propose an alternative frequency curve in which the weight of each MTD is equal, independent of its age uncertainty. I conclude that this error in the frequency curve does not significantly impact the interpretations made by the authors, but that similar errors may lead to wrong interpretations when such a frequency curve would be used in a quantitative manner. |
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