Offshore landslide hazard curves from mapped landslide size distributions
Journal of Geophysical Research B: Solid Earth
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Abstract
We present a method to calculate landslide hazard curves along offshore margins based on size distributions of submarine landslides. The method analyzes ten different continental margins, that were mapped by high-resolution multibeam sonar with landslide scar areas measured by a consistent GIS procedure. Statistical tests of several different probability distribution models indicate that the lognormal model is most appropriate for these siliciclastic environments, consistent with an earlier study of the U.S. Atlantic margin [Chaytor et al., 2009]. Parameter estimation is performed using the maximum likelihood technique and confidence intervals are determined using likelihood profiles. Pairwise comparison of size distributions for the ten margins indicates that the U.S. Atlantic and Queen Charlotte margins are different than most other margins. These margins represent end members, with the U.S. Atlantic margin having the highest mean scar area and the Queen Charlotte margin, the lowest. We demonstrate that empirical, offshore landslide hazard curves can be developed from the landslide size distributions, if the duration of mapped landslide activity is known. This study indicates that the shape parameter of the size distribution is similar among all ten margins and thus the shape of the hazard curves is also similar. Significant differences in hazard curves among the margins are therefore related to differences in mean sizes and, potentially, differences in the duration of landslide activity.
Suggested Citation
Geist, E.L., and ten Brink, U., 2019, Offshore landslide hazard curves from mapped landslide size distributions: Journal of Geophysical Research B: Solid Earth, v. 124, no. 4, p. 3320-3334, https://doi.org/10.1029/2018JB017236.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Offshore landslide hazard curves from mapped landslide size distributions |
| Series title | Journal of Geophysical Research B: Solid Earth |
| DOI | 10.1029/2018JB017236 |
| Volume | 124 |
| Issue | 4 |
| Publication Date | April 17, 2019 |
| Year Published | 2019 |
| Language | English |
| Publisher | American Geophysical Union |
| Contributing office(s) | Pacific Coastal and Marine Science Center |
| Description | 15 p. |
| First page | 3320 |
| Last page | 3334 |