Applicability of Newmark method at regional, sub-regional and site scales: seismically induced Bullas and La Paca rock-slide cases (Murcia, SE Spain) |
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Authors: | Martín Jesús Rodríguez-Peces José Luis Pérez-García Julián García-Mayordomo José Miguel Aza?ón Juan Miguel Insua-Arévalo and Jorge Delgado-García |
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Institution: | (1) Departamento de Geodin?mica, Facultad de Ciencias, Universidad de Granada, C/Fuentenueva s/n, 18002 Granada, Spain;(2) Departamento de Ingenier?a Cartogr?fica, Geod?sica y Fotogrametr?a, Universidad de Ja?n, Campus de las Lagunillas, s/n. Edif. A3, 23071 Ja?n, Spain;(3) Instituto Geol?gico y Minero de Espa?a (IGME), C/La Calera, 1, 28760 Tres Cantos, Madrid, Spain;(4) Instituto Andaluz de Ciencias de la Tierra, Universidad de Granada-CSIC, Granada, Spain;(5) Departamento de Geodin?mica, Facultad de Ciencias Geol?gicas, Universidad Complutense de Madrid, 28040 Madrid, Spain |
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Abstract: | In this paper, the applicability of the Newmark method at regional, sub-regional and site scales has been investigated in
the Lorca Basin (Murcia). This basin is located in one of the most seismically active regions of Spain. The area is very interesting
for studying earthquake-induced slope instabilities as there are well-known cases associated with specific earthquakes. For
the regional and sub-regional scales, a geographic information system has been used to develop an implementation of Newmark
sliding rigid block method. Soil and topographic amplification effects have been particularly considered. Subsequently, ‘Newmark
displacement’ maps for deterministic seismic scenarios have been produced. Some specific studies have also been performed
using limit equilibrium methods to estimate the safety factor and the critical acceleration of certain slope instabilities
at a site scale. These instabilities were the rock slides related to recent seismic series at the Lorca Basin: 2002 Bullas
(M
w = 5.0) and 2005 La Paca (M
w = 4.8). Finally, the safety factor, critical acceleration and Newmark displacement values estimated at different scales have
been compared to determine which scale is most suitable for the Newmark method. |
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Keywords: | |
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