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- Title
Dynamics of the Oso-Steelhead landslide from broadband seismic analysis.
- Authors
Hibert, C.; Stark, C. P.; Ekström, G.
- Abstract
We carry out a combined analysis of the shortand long-period seismic signals generated by the devastating Oso-Steelhead landslide that occurred on 22 March 2014. The seismic records show that the Oso-Steelhead landslide was not a single slope failure, but a succession of multiple failures distinguished by two major collapses that occurred approximately 3 min apart. The first generated long-period surface waves that were recorded at several proximal stations. We invert these long-period signals for the forces acting at the source, and obtain estimates of the first failure runout and kinematics, as well as its mass after calibration against the mass-centre displacement estimated from remotesensing imagery. Short-period analysis of both events suggests that the source dynamics of the second event is more complex than the first. No distinct long-period surface waves were recorded for the second failure, which prevents inversion for its source parameters. However, by comparing the seismic energy of the short-period waves generated by both events we are able to estimate the volume of the second. Our analysis suggests that the volume of the second failure is about 15-30% of the total landslide volume, giving a total volume mobilized by the two events between 7×106 and 10×106 m³, in agreement with estimates from ground observations and lidar mapping.
- Subjects
LANDSLIDES; SEISMOLOGY; SURFACE waves (Seismic waves); GEODYNAMICS; CALIBRATION
- Publication
Natural Hazards & Earth System Sciences Discussions, 2015, Vol 3, Issue 6, p1265
- ISSN
2195-9269
- Publication type
Article
- DOI
10.5194/nhess-15-1265-2015