Geomorphological map of the Po Plain, Italy, at a scale of 1:250 000

Castiglioni, G. B.; Biancotti, A.; Bondesan, M.; Cortemiglia, Gian Camillo; Elmi, Carlo; Favero, V.; Gasperi, G.; Marchetti, Giuseppe; Orombelli, G.; Pellegrini, Giovanni; Tellini, Claudio

doi:10.1002/(sici)1096-9837(199911)24:12<1115::aid-esp38>3.0.co;2-z

Cited by 49 publications

(35 citation statements)

References 2 publications

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“…This is an indication that, although the morphology of the activated area appears homogenously flat with very small differences in elevation and quite monotonous from a geologic point of view, there should be a local characteristic that increases the susceptibility of sediments to liquefaction. A first comparison between the geomorphic characteristics of the area (Castiglioni et al, 1999) and the location of liquefaction and fracturing sites shows a good correlation of liquefaction with the location of the paleo-river channels, outflow channels, and fans of the Secchia, Panaro and Reno rivers and with the levees of the Cavo Napoleonico channel (artificial channel, connecting the Reno and Po rivers, initiated in 1807). Due to their origin, most of these features are slightly higher (1-2 m) in elevation with respect to the basal level of the plain.…”

Section: Discussionmentioning

confidence: 99%

Liquefaction phenomena associated with the Emilia earthquake sequence of May–June 2012 (Northern Italy)

Alessio¹,

Alfonsi²,

Brunori³

et al. 2013

Nat. Hazards Earth Syst. Sci.

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Abstract. In this paper we present the geological effects induced by the 2012 Emilia seismic sequence in the Po Plain. Extensive liquefaction phenomena were observed over an area of ~ 1200 km2 following the 20 May, ML 5.9 and 29 May, ML 5.8 mainshocks; both occurred on about E–W trending, S dipping blind thrust faults. We collected the coseismic geological evidence through field and aerial surveys, reports from local people and Web-based survey. On the basis of their morphologic and structural characteristics, we grouped the 1362 effects surveyed into three main categories: liquefaction (485), fractures with liquefaction (768), and fractures (109). We show that the quite uneven distribution of liquefaction effects, which appear concentrated and aligned, is mostly controlled by the presence of paleo-riverbeds, out-flow channels and fans of the main rivers crossing the area; these terrains are characterised by the pervasive presence of sandy layers in the uppermost 5 m, a local feature that, along with the presence of a high water table, greatly favours liquefaction. We also find that the maximum distance of observed liquefaction from the earthquake epicentre is ~ 30 km, in agreement with the regional empirical relations available for the Italian Peninsula. Finally, we observe that the contour of the liquefaction observations has an elongated shape almost coinciding with the aftershock area, the InSAR deformation area, and the I ≥ 6 EMS area. This observation confirms the control of the earthquake source on the liquefaction distribution, and provides useful hints in the characterisation of the seismogenic source responsible for historical and pre-historical liquefactions.

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Section: Discussionmentioning

confidence: 99%

Liquefaction phenomena associated with the Emilia earthquake sequence of May–June 2012 (Northern Italy)

Alessio¹,

Alfonsi²,

Brunori³

et al. 2013

Nat. Hazards Earth Syst. Sci.

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“…The LGM ice extent in Austria was mapped in detail by van Husen (1987). Several reconstructions from surrounding regions of the Alps, including regional reconstructions of the central Swiss Alps (Florineth and Schlüchter, 1998), the Grisons (Florineth, 1998), the Upper Valais to Savoy (Kelly et al, 2004), the French Alps (Buoncristiani and Campy, 2011), the Po plain in Italy (Castiglioni et al, 1999) and Slovenia (Bavec et al, 2004), complete the picture of LGM glaciation extent. They have been compiled in a map covering the entire Alps (Geologische Bundesanstalt, 2013).…”

Section: Introductionmentioning

confidence: 99%

Last Glacial Maximum precipitation pattern in the Alps inferred from glacier modelling

Becker¹,

Seguinot²,

Jouvet³

et al. 2016

Geogr. Helv.

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Abstract. During the Last Glacial Maximum (LGM), glaciers in the Alps reached a maximum extent, and broad sections of the foreland were covered by ice. In this study, we simulated the alpine ice cap using a glacier flow model to constrain the prevailing precipitation pattern with a geomorphological reconstruction of ice extent. For this purpose we forced the model using different temperature cooling and precipitation reduction factors. The use of the present-day precipitation pattern led to a systematic overestimation of the ice cover on the northern part of the Alps relative to the southern part. To reproduce the LGM ice cap, a more severe decrease in precipitation in the north than in the south was required. This result supports a southwesterly advection of atmospheric moisture to the Alps, sustained by a southward shift of the North Atlantic storm track during the LGM.

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“…A large-scale national project for the Geomorphological Map of Italy (Castiglioni, 1997a) provided the regional framework of landforms and altimetry (Castiglioni, 1997b) for the Po Plain. Other studies were addressed to the relationships between soil development and features of parent material (Cremaschi, 1979(Cremaschi, , 1987(Cremaschi, , 1990 and between archaeological remnants and their stratigraphic frame (Baroni and Biagi, 1988;Cremaschi and Marchetti, 1995).…”

Section: Introductionmentioning

confidence: 99%

The last 40 ka evolution of the Central Po Plain between the Adda and Serio rivers

Ravazzi¹,

Deaddis²,

Amicis³

et al. 2012

geomorphologie

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We reconstructed the geological evolution and the history of the fluvial network in the central part of the Po Plain in Lombardy, northern Italy, since the Middle Würm. We focused on evidences of dissection and incision of former rivers into the large outwash fans originating from piedmont glaciers of the southern Alps in the Last Glacial Maximum. The studied area is located between the Po River and the Alps north of the Adda/Serio river confluence, around the town of Crema. Morphometric analysis and stratigraphic investigation were carried out, supported by palaeobotany, sand petrography and radiometric dating. The obtained stratigraphic framework is presented by cross sections and by a geological map. During the Middle Würm, an alluvial fan of the Adda River oriented NWN-SSE occupied the area, feeding south and west the Romanengo hill. A substantial reorganisation of the fluvial network occurred during the Last Glacial Maximum. Since 32-30 ka cal. BP, the area was fed by two outwash rivers, originated from the Adda and the Oglio piedmont glaciers, both characterised by a prevalent southward drainage, 160°-170° S in the LGM. After the LGM the fan-head was dissected by trunk channels and, at the downslope fan limit, the southward flow shifted to a southeastern direction. Thereafter, major dissection and downcutting occurred in the Lateglacial, confining the major rivers into large alluvial corridors, further shaped by lateral erosion during the Holocene. The Late Holocene history of the Serio River is marked by fluvial floods during the late Roman Age, and by a capture of the lower reach by the Adda River. The geomorphological evidence supports the historically inferred age assignment of the diversion to 12th-14th c. AD. (Marchetti, 1990(Marchetti, , 2002. fig. 10 à fig. 12) fig. 11 et fig. 13A) D'un point de vue méthodologique, on a préparé un DTM détaillé en se servant des points cotés de la Cartographie Technique de la Région Lombardie (fig. 2). La succession stratigraphique a été décrite sur le terrain à partir de plusieurs affleurements et carottes, dont les plus intéressantes ont été soumises aux analyses radiocarbone, palynologiques et minéralogiques (sables). 14 dates AMS ont été obtenues sur plantes terrestres, calibrées avec CALIB à partir de la courbe de calibration IntCal09 (Reimer et al., 2009 ; tab. 2) et indiquées dans le texte « cal. BP ». Certains vestiges archéo-logiques présents dans les dépôts ont été examinés, étant donné qu'ils peuvent fournir des indices chronologiques utiles. L'analyse palynologique s'est faite sur 400 grains. Les plantes aquatiques et de marais ont été exclues de la somme pollinique. Le diagramme pollinique intègre la séquence de tourbes et de tourbes sableuses déposées dans le marais de Mosi di Crema (fig. 9), quelques données polliniques sur échantillons isolés, prélevés dans les dépôts lacustres de Cresmiero, et la séquence fluvio-palustre de Ripalta Guerina (tab. 5). Pour chacun des 13 échantillons de sables étu-diés, 400 points ont été comptés avec la méth...

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Geomorphological map of the Po Plain, Italy, at a scale of 1:250 000

Cited by 49 publications

References 2 publications

Liquefaction phenomena associated with the Emilia earthquake sequence of May–June 2012 (Northern Italy)

Liquefaction phenomena associated with the Emilia earthquake sequence of May–June 2012 (Northern Italy)

Last Glacial Maximum precipitation pattern in the Alps inferred from glacier modelling

The last 40 ka evolution of the Central Po Plain between the Adda and Serio rivers

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