Journal
NATURAL HAZARDS AND EARTH SYSTEM SCIENCES
Volume 15, Issue 6, Pages 1265-1273Publisher
COPERNICUS GESELLSCHAFT MBH
DOI: 10.5194/nhess-15-1265-2015
Keywords
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Funding
- Geomorphology and Land-use Dynamics/Geophysics programs [1227083, 1148176]
- US National Science Foundation Division of Earth Sciences
- US National Science Foundation Division of Civil, Mechanical and Manufacturing Innovation
- Hazards SEES program [1331499]
- Division Of Earth Sciences
- Directorate For Geosciences [1227083, 1148176] Funding Source: National Science Foundation
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [1331499] Funding Source: National Science Foundation
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We carry out a combined analysis of the short- and 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 remote-sensing 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 x 10(6) and 10 x 10(6) m(3), in agreement with estimates from ground observations and lidar mapping.
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