Transient reactivation of a deep-seated landslide by undrained loading captured with repeat airborne and terrestrial lidar
Abstract
Landslides reactivate due to external environmental forcing or internal mass redistribution, but the process is rarely documented quantitatively. We capture the three‐dimensional, 1‐m resolution surface deformation field of a transiently reactivated landslide with image correlation of repeat airborne lidar. Undrained loading by two debris flows in the landslide's head, rather than external forcing, triggered reactivation. After that loading, the lower 2 km of the landslide advanced by up to 14 m in 2 years before completely stopping. The displacement field over those 2 years implies that the slip surface gained 1 kPa of shear strength, which was likely accomplished by a negative dilatancy‐pore pressure feedback as material deformed around basal roughness elements. Thus, landslide motion can be decoupled from external environmental forcing in cases, motivating the need to better understand internal perturbations to the stress field to predict hazards and sediment fluxes as landscapes evolve.
Additional Information
© 2018 American Geophysical Union. Received 6 MAR 2018; Accepted 29 APR 2018; Accepted article online 7 MAY 2018; Corrected 24 MAY 2018; Published online 18 MAY 2018. This article was corrected on 24 MAY 2018. The authors thank George Hilley and an anonymous reviewer for comments that improved the quality of the manuscript, Weyerhaeuser Company for access to the field site and airborne lidar data acquisition, and PSU student field assistants. McCarley was supported by a GSA student grant. Airborne lidar data are available through the Oregon Lidar Consortium (http://www.oregongeology.org/lidar/).Errata
In the originally published version of this article, the last sentence of the 6th paragraph of section 5, following equation (3), had begun incorrectly with "A convex‐up displacement..." rather than the correct "A concave‐up displacement..." This error has since been corrected, and the present version may be considered the authoritative version of record.Attached Files
Published - Booth_et_al-2018-Geophysical_Research_Letters.pdf
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Additional details
- Eprint ID
- 86325
- Resolver ID
- CaltechAUTHORS:20180509-161712035
- Geological Society of America
- Created
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2018-05-10Created from EPrint's datestamp field
- Updated
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2021-11-15Created from EPrint's last_modified field
- Caltech groups
- Seismological Laboratory, Division of Geological and Planetary Sciences