Journal cover Journal topic
Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
Nat. Hazards Earth Syst. Sci., 15, 2473-2483, 2015
https://doi.org/10.5194/nhess-15-2473-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
09 Nov 2015
Liquefaction susceptibility assessment in fluvial plains using airborne lidar: the case of the 2012 Emilia earthquake sequence area (Italy)
R. Civico, C. A. Brunori, P. M. De Martini, S. Pucci, F. R. Cinti, and D. Pantosti Istituto Nazionale di Geofisica e Vulcanologia, Rome, Italy
Abstract. We report a case study from the Po River plain region (northern Italy), where significant liquefaction-related land and property damage occurred during the 2012 Emilia seismic sequence. We took advantage of a 1 m pixel lidar digital terrain model (DTM) and of the 2012 Emilia coseismic liquefaction data set to (a) perform a detailed geomorphological study of the Po River plain area and (b) quantitatively define the liquefaction susceptibility of the geomorphologic features that experienced different abundance of liquefaction. One main finding is that linear topographic highs of fluvial origin – together with crevasse splays, abandoned riverbeds and very young land reclamation areas – acted as a preferential location for the occurrence of liquefaction phenomena. Moreover, we quantitatively defined a hierarchy in terms of liquefaction susceptibility for an ideal fluvial environment. We observed that a very high liquefaction susceptibility is found in coincidence with fluvial landforms, a high-to-moderate liquefaction susceptibility within a buffer distance of 100 and 200 m from mapped fluvial landforms and a low liquefaction susceptibility outside fluvial landforms and relative buffer areas. Lidar data allowed a significant improvement in mapping with respect to conventionally available topographic data and/or aerial imagery. These results have significant implications for accurate hazard and risk assessment as well as for land-use planning. We propose a simple geomorphological approach for liquefaction susceptibility estimation. Our findings can be applied to areas beyond Emilia that are characterized by similar fluvial-dominated environments and prone to significant seismic hazard.

Citation: Civico, R., Brunori, C. A., De Martini, P. M., Pucci, S., Cinti, F. R., and Pantosti, D.: Liquefaction susceptibility assessment in fluvial plains using airborne lidar: the case of the 2012 Emilia earthquake sequence area (Italy), Nat. Hazards Earth Syst. Sci., 15, 2473-2483, https://doi.org/10.5194/nhess-15-2473-2015, 2015.
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Short summary
The 2012 Emilia seismic sequence (Italy) caused significant liquefaction-related damage. We used a lidar DTM and the 2012 liquefaction data to (a) perform a geomorphological study of the Po River plain and (b) define the liquefaction susceptibility of the geomorphologic features. Results indicate that fluvial landforms acted as a preferential location for the occurrence of liquefaction. We quantitatively defined a hierarchy in terms of liquefaction susceptibility for an ideal fluvial environment
The 2012 Emilia seismic sequence (Italy) caused significant liquefaction-related damage. We used...
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