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| Titel |
Dynamics of the Oso-Steelhead landslide from broadband seismic analysis |
| VerfasserIn |
C. Hibert, C. P. Stark, G. Ekström |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Sciences ; 15, no. 6 ; Nr. 15, no. 6 (2015-06-17), S.1265-1273 |
| Datensatznummer |
250119535
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| Publikation (Nr.) |
 copernicus.org/nhess-15-1265-2015.pdf |
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| Zusammenfassung |
| 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 × 106 and
10 × 106 m3, in agreement with estimates from ground
observations and lidar mapping. |
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