Hazard and Risk Scenarios of Landslides Triggered by Earthquakes

Romeo, Roberto; Mari, Milena; Pappafico, Giulio; Tiberi, Pierpaolo; Gori, Umberto; Veneri, Francesco; Tonelli, Gianluigi; Paletta, Carmela

doi:10.1007/978-3-642-31427-8_45

Cited by 1 publication

(1 citation statement)

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“…Maps of the slope collapse probabilities based on D N were also proposed and referred to the ground-shaking scenario of interest. The probabilistic seismic landslide hazard-mapping procedure for Newmark's coseismic slope displacements has been applied by many researchers (Capolongo et al 2002;Saygili and Rathje 2009;Wang and Lin 2010;Romeo et al 2011;Vollmert et al 2011). While these applications have generally referred to first time slope failures (Skempton 1985;Hutchinson 1988) and have not been specifically devoted to the analysis of co-seismic displacements of pre-existing landslide masses, in this study the interest has been focused on the co-seismic displacements of pre-existing landslide masses, due to their complex interactions with the seismic waves.…”

Section: Introductionmentioning

confidence: 99%

Earthquake-reactivated landslide scenarios in Southern Italy based on spectral-matching input analysis

Bozzano¹,

Esposito²,

Martini

et al. 2013

Bull Earthquake Eng

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The Tyrrhenian portion of the Calabria region (southern Italy) is particularly prone to landslides as a consequence of intense morphodynamic processes. These processes affect the slopes that are composed of highly jointed metamorphic rock masses. Moreover, the frequent intense rainfalls and the up to Mw 7.0 regional earthquakes represent the main landslide triggering factors. An area of approximately 45 km 2 was selected as a test site in the context of a regional project aimed at reconstructing possible earthquake-reactivated landslide scenarios (i.e., referred to already existing landslide masses). An inventory map led to the identification of 175 landslides, including rock slides, earth slides and rock falls. Groundmotion scenarios based on a spectral-matching method were derived to evaluate the expected earthquake-induced displacements of the existing landslides. Naturally recorded acceleration time histories were selected from international ground-motion databases based on a similarity index and considered representative of the seismological features of the considered seismic sources (i.e., epicentral distance, magnitude, focal mechanism). Spectral attenuation was considered, according to well-established attenuation laws, to define the expected response spectrum at the outcropping bedrock corresponding to each existing landslide. Subsequently, the selected natural records were modified to guarantee spectral matching with the attenuated response spectra at each landslide site. The derived time histories were used to compute coseismic displacements via the classic Newmark's sliding-block method. Different scenarios of co-seismic landslide displacements or collapse were generated for different pore-water pressure hypotheses. The strongest Mw > 6 seismic scenario (Messina Straits seismogenic source) indicated an exceedance probability of earthquake-induced co-seismic landslide (2013) 11:1927-1948 collapse varying from 20 to 55 % with the increasing severity of the pore-water pressures. This probability corresponds to a percentage of co-seismic landslide displacements up to 40 % of the total inventoried landslides. The exceedance probability indicated that co-seismic landslide collapse drops below 20 % for Mw < 6 seismic scenarios. In contrast, if a uniform probability is assumed for the seismic action occurrence, i.e., return periods of 475 and 2,475 years, the total percentage of landslide co-seismic displacements could be as high as 70 and 90 %, respectively, for the considered pore-water pressures.Earthquake Eng

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Section: Introductionmentioning

confidence: 99%