Evidence for sea-level oscillations by the “characteristic thickness” of marine deposits from raised terraces of Southern Calabria (Italy)

Dumas, Bernard; Guérémy, Pierre; Raffy, Jeannine

doi:10.1016/j.quascirev.2004.12.011

Cited by 52 publications

(21 citation statements)

References 43 publications

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“…The area is also characterised by the outcropping of marine terrace deposits related to many hierarchical orders (Miyauchi et al 1994;Dumas et al 2005) and is composed of reddishbrown gravels and sands with a sub-horizontal bedding attitude. These marine deposits lie over the Ercinic metamorphic substratum with an unconformity surface whose bottom layer is defined by a one-metre-thick bed of pebbles.…”

Section: Geological Setting Of the Study Areamentioning

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: Geological Setting Of the Study Areamentioning

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 occurrence of large active faults has been inferred based on the uplift of the Pleistocene marine terraces along the coast of the Strait, where five to twelve orders of different age terraces have been identified172223. Uplift was faster in the Calabrian sector, where normal faults show evidence of recent activity.…”

mentioning

confidence: 99%

The tectonic puzzle of the Messina area (Southern Italy): Insights from new seismic reflection data

Doglioni

Ligi

Scrocca

et al. 2012

Sci Rep

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The Messina Strait, that separates peninsular Italy from Sicily, is one of the most seismically active areas of the Mediterranean. The structure and seismotectonic setting of the region are poorly understood, although the area is highly populated and important infrastructures are planned there. New seismic reflection data have identified a number of faults, as well as a crustal scale NE-trending anticline few km north of the strait. These features are interpreted as due to active right-lateral transpression along the north-eastern Sicilian offshore, coexisting with extensional and right-lateral transtensional tectonics in the southern Messina Strait. This complex tectonic network appears to be controlled by independent and overlapping tectonic settings, due to the presence of a diffuse transfer zone between the SE-ward retreating Calabria subduction zone relative to slab advance in the western Sicilian side.

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“…Tectonics played a leading role over the geological times and it is responsible of the high seismic activity of the Peloritani region, characterized by the recurrence of several destructive historical earthquakes (e.g., [33]). In particular, tectonic activity in this area is testified by the presence of regional fault sets, striking W-E, NW-SE, and NNW-SSE, and some authors recognized uplift signs at several marine terraces occurring along the coast, with an average rate of 1.7 mm/year in the study area (e.g., [34,35] and references therein). According to Argnani et al [36] and references therein, large and destructive earthquakes can be associated with fault activity along southeastern Sicily and southern Calabria faults, testifying to the link between tectonics and seismic activity in the study area.…”

Section: The Saracen Castle Of Taormina: a MIX Of History And Geologymentioning

confidence: 92%

Rockfall Analysis for Preliminary Hazard Assessment of the Cliff of Taormina Saracen Castle (Sicily)

et al. 2018

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Abstract:A rockfall analysis at one of the most relevant cultural heritage sites of northeastern Sicily (Italy) is presented herein with the aim of assessing the hazard arising from the unstable conditions of the rock cliff of Taormina city, upon which the Saracen Castle is perched on its top. Several rockfalls affected this area in the latest years, representing a serious threat for the safety of inhabitants and tourists. Therefore, the qualitative Evolving Rockfall Hazard Assessment (ERHA) was applied for the hazard zonation, supported by rock mass surveys and Terrestrial Laser Scanner prospecting. Kinematic analysis revealed that the unstable rock failure patterns are represented by planar/wedge sliding and toppling, while simulation of potential rockfalls allowed studying the impact of future events in terms of trajectory and energy. This is higher at the foot of scarps and in steeper sectors, where the application of ERHA identified a critical zone close to the inhabited center, which is one of the main elements at risk, along with a pedestrian tourist path. Achieved results represent a starting point for the definition of risk management strategies and provide a scientific contribution to the study of hazard and risk arising from rockfall occurrence.

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Evidence for sea-level oscillations by the “characteristic thickness” of marine deposits from raised terraces of Southern Calabria (Italy)

Cited by 52 publications

References 43 publications

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

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

The tectonic puzzle of the Messina area (Southern Italy): Insights from new seismic reflection data

Rockfall Analysis for Preliminary Hazard Assessment of the Cliff of Taormina Saracen Castle (Sicily)

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