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| Titel |
The role of near-field interaction between seismic waves and slope on the triggering of a rockslide at Lorca (SE Spain) |
| VerfasserIn |
P. Alfaro, J. Delgado, F. J. García-Tortosa, J. J. Giner, L. Lenti, C. López-Casado, S. Martino, G. Scarascia Mugnozza |
| 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 Science ; 12, no. 12 ; Nr. 12, no. 12 (2012-12-12), S.3631-3643 |
| Datensatznummer |
250011255
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| Publikation (Nr.) |
 copernicus.org/nhess-12-3631-2012.pdf |
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| Zusammenfassung |
A ~1000 m3 rockslide occurred close to Lorca (SE Spain) during
the main shock (Mw = 5.1) of the May 2011 seismic sequence. The location
of the rockslide, within 10 km of the earthquake epicenter and along the
southern slope of a valley in which similar geological conditions occur on
both slopes of the valley, suggests a significant near-field effect due to
local seismic response. This could be related to the specific interaction
between the topography and the obliquely propagating seismic waves.
A dynamic stress strain numerical model was constructed using the FLAC 7.0
finite difference code to back analyze the Lorca rockslide event and relate
its occurrence to both the local seismic amplification and the interaction
between seismic waves and local topography. The results indicate that only
for seismic waves with incidence angles in the range 0°–50° are
the occurred slope instabilities expected. These results do not
significantly change when varying the values for either stiffness or
strength parameters within the range of the experimental data. |
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