Author:
Alfaro P.,Delgado J.,García-Tortosa F. J.,Giner J. J.,Lenti L.,López-Casado C.,Martino S.,Scarascia Mugnozza G.
Abstract
Abstract. 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.
Subject
General Earth and Planetary Sciences
Reference66 articles.
1. Alfaro, P., Delgado, J., Garcia-Tortosa, F. J., Lenti, L., Lopez. J. A., Lopez-Casado, C., and Martino, S.: Widespread landslides induced by the Mw 5.1 earthquake of 11 May 2011 in Lorca, SE Spain, Eng. Geol., 137–138, 40–52, 2012.
2. Ashford, S. A. and Sitar, N.: Analysis of topographic amplification of inclined shear waves in a steep coastal bluff, Bull. Seism. Soc. Am., 87, 692–700, 1997.
3. Ashford, S. A., Sitar, N., Lysmer, J., and Deng, N.: Topographic effects on the seismic response of steep slopes, Bull. Seism. Soc. Am., 87, 701–709, 1997.
4. Athanasopoulos, G. A., Pelekis, P. C., and Leonidou, E. A.: Effects of surface topography on seismic ground response in the Egion (Greece) 15 June 1995 earthquake, Soil Dynam. Earthq. Eng., 18, 135–149, 1999.
5. Bakavoli, M. K. and Hagshenhas, E.: Experimental and numerical study of topographic site effect on a hill near Tehran, Proc. Fifth International Conference of Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics, 24–29 May, S. Diego, California, 1–9, 2010.
Cited by
22 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献