A new empirical estimator of coseismic landslide displacement for Zagros Mountain region (Iran) |
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Authors: | Ali M Rajabi Mohammad R Mahdavifar M Khamehchiyan and V Del Gaudio |
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Institution: | (1) Civil Engineering Department, Qom University, PO Box 14115-175, Qom, Iran;(2) Tarbiat Modares University, Tehran, Iran;(3) Geotechnical Engineering Research Center, International Institute of Earthquake Engineering and Seismology (IIEES), PO Box 19395-3913, Tehran, Iran;(4) Engineering Geology Department, Tarbiat Modares University, PO Box 14115-175, Tehran, Iran;(5) Dipartimento di Geologia e Geofisica, Universita` degli Studi di Bari, Campus, via E.Orabona 4, 70125 Bari, Italy |
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Abstract: | Earthquake-induced landslides are responsible worldwide for significant socioeconomic losses and historically have a prominent
position in the list of natural hazards affecting the Iran plateau. As a step toward the development of tools for the assessment
and the management of this kind of hazard at regional scale, an empirical estimator of coseismic displacements along potential
sliding surfaces was obtained through a regression analysis for the Zagros region, a mountainous Iranian region subjected
to earthquake-induced landslides. This estimator, based on the Newmark’s model, allows to evaluate the expected permanent
displacement (named “Newmark displacement”) induced by seismic shaking of defined energy on potential sliding surface characterized
by a given critical acceleration. To produce regression models for Newmark
displacement estimators, a data set was constructed for different critical
acceleration values on the basis of 108 accelerometric recordings from 80 Iranian earthquakes with moment magnitudes between 3.6 and 7.
The empirical estimator has a general form, proposed by Jibson (Eng Geol 91:209–218, 2007), relating Newmark
displacement to Arias
intensity (as parameter representing the energy of the seismic forces) and to critical
acceleration (as parameter representing the dynamic shear resistance of the sliding mass). As an example of application, this relation
was employed to provide a basic document for earthquake-induced landslide hazard assessment at regional scale, according to
a method proposed by Del Gaudio et al. (Bull Seismol Soc Am 93:557–569, 2003), applied to the whole Iranian territory, including Zagros region. This method consists in evaluating the shear resistance
required to slopes to limit the occurrence of seismically induced failures, on the basis of the Newmark’s model. The obtained
results show that the exposure to landslide seismic induction is maximum in the Alborz Mountains region, where critical
accelerations up to ~0.1 g are required to limit the probability of seismic triggering of coherent type landslides within 10% in 50 years. |
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