Seismically-induced landslides by a low-magnitude earthquake: The Mw 4.7 Ossa De Montiel event (central Spain)

The Ossa de Montiel (2015/02/23, Mw 4.7) earthquake struck the central part of Spain and was felt far from the epicenter (>300km). Even though ground shaking was slight (Imax =V, EMS-98 scale), the earthquake triggered many small rock falls, most at distances of 20-30km from the epicenter, greate...

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Bibliographic Details
Published in:Engineering geology 2015-09, Vol.196, p.280-285
Main Authors: Delgado, J, Garcia-Tortosa, F J, Garrido, J, Loffredo, A, Lopez-Casado, C, Martin-Rojas, I, Rodriguez-Peces, MJ
Format: Article
Language:English
Subjects:
Attenuation
Earthquake engineering
Earthquakes
Instability
Landslides
Roads
Slopes
Stability
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Summary:The Ossa de Montiel (2015/02/23, Mw 4.7) earthquake struck the central part of Spain and was felt far from the epicenter (>300km). Even though ground shaking was slight (Imax =V, EMS-98 scale), the earthquake triggered many small rock falls, most at distances of 20-30km from the epicenter, greater than previously recorded in S Spain (16km) for earthquakes of similar magnitudes. The comparative analysis of available data for this event with records from other quakes of the Betic cordillera (S and SE Spain) seems to indicate a slower pattern of ground-motion attenuation in central Spain. This could explain why slope instabilities occurred at larger distances. Instability was more frequent, and occurred at larger distances, in road cuts than in natural slopes, implying that such slope types are highly susceptible to seismically induced landslides.
ISSN:0013-7952
DOI:10.1016/j.enggeo.2015.07.016