Ciulli, A.

Disperati, L.

Guastaldi, E.

Rindinella, A.

Virdis, S.

Ciulli A.

Disperati L.

Guastaldi E.

Rindinella A.

Virdis S.

Archivio della Ricerca - Università degli Studi di Siena

5/4/2018 Interdisciplinary approach for geomorphological study of an high slope inst...file:///C:/Dropbox%20(Geomatica_DSFTA)/Doc/Congressi/33IGC_Oslo_2008/CD_33IGC_Oslo_2008/33IGC/1345601.html 1/1HomeSearch AbstractsAuthor IndexSymposia ProgrammesSponsorsHelp  GSM-01 General contributions to geomorphology Interdisciplinary approach for geomorphological study of an high slope instability area in thenorthern Apennines mountains Alice Ciulli, University of Siena (Italy) Leonardo Disperati, University of Siena (Italy) Enrico Guastaldi, University of Siena (Italy) Andrea Rindinella, University of Siena (Italy) Salvatore Virdis, University of Siena (Italy)   The Corniglio landslide (CL) is one of the most significant landslides in the Northern Apennines whichcovers an area of about 3 km x 1 km close to the Corniglio village (Pr, Italy). It is an active compositeretrogressive landslide where deep-seated sliding deformation develops together with shallower earthslumps. Geophysical surveys from the literature suggested the occurrence of high deformationphenomena up to the depth of about 120 m.  A geomorphologic survey and photogeologic interpretation were performed along with grounddisplacement monitoring related to the last 30 years in order to study reasonable relationships amongthe CL and other large scale gravitational processes within the study area. The state of activity from 1978 to 2005 was analysed by evaluating the displacement of homologousground targets on multitemporal orthophotographs related to 1988, 1994, 1996, 1998, 2005 and aQuickbird imagery related to 2003. This set data was registered to the Regione Emila Romagnatopographic map of year 1978, at the scale of 1:5,000. Periods of little or no activity separated by rapidand occasionally dramatic sliding (e.g. the October-November 1996 event with ground displacements ofmore than 30 m) were recognized. These investigations allowed us to suppose the main triggering factors for reactivation of the CL. Heavyrainfalls of October-November 1994 and October 1998 occurred before reactivations of the end of 1994and 1998. Moreover, low-medium intensity (from 2.2 to 5.4 Richter magnitude) seismic events wererecorded within the Emilia Apennines before reactivations of January and October 1996. The CL has been referred to as a complex landslide. However, the fieldwork and photogeologicinterpretation suggested an alternative model for the gravitational evolution of the study area. The hill among the Bratica river (east) the CL (west) and the Parma river (north), where is located theCorniglio village, is made up, from the bottom, of the "Argille e Calcari" and the "Arenarie del Bratica"formations (Canetolo Unit, Eocene-Oligocene), tectonically covered by the marly limestones flysch of theMt. Caio Unit (Late Cretaceous). The local occurrence of the rigid behaviour lithotypes of Mt. Caio flysch and "Arenarie del Bratica"(sandstones) over the plastic low-shear strength "Argille e Calcari" (marly clays), may represent acritical configuration for the stability of the area. Moreover, the above hill is affected by relevant east-west trending lineaments, involving also theCorniglio village, which toward south originate a huge near-vertical trench where the Mt. Caio flysch isthrown down to the north of the trench. This trench is bounded to the east by the Bratica river, while tothe west by the CL main scarp area, where also the Mt. Caio flysch thrust converges. This frameworksuggests that the CL may be part of a larger deep seated gravitational slope deformation also includingthe hill among the Bratica river the CL main body and the Parma river. CD-ROM Produced by X-CD Technologies  

Interdisciplinary approach for geomorphological study of an high slope instability area in the northern Apennines mountains

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Interdisciplinary approach for geomorphological study of an high slope instability area in the northern Apennines mountains

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