2D electrical resistivity imaging of some complex landslides in Lucanian Apennine chain, southern Italy
Tóm tắt
We use high-resolution electrical resistivity imaging to delineate the geometry of complex landslides in the Lucanian Apennine chain of southern Italy, to identify the discontinuity between the landslide material and bedrock, and to locate possible surfaces of reactivation. The Lucanian Apennine chain is characterized by high hydrogeological hazard and shows a complete panorama of mass movements. In this area, all typologies of landslides markedly predisposed and tightly controlled by the geostructural characteristics, are found: rotational and translational slides, rototranslational slides, earth and mudflows, as well as deep-seated gravitational slope phenomena with a predominance of rototranslational slides evolving as earthflow slides. Three test sites, characterized by complex geology and a high hydrogeologic hazard, are studied. The Giarrossa and Varco Izzo earthflow slides are located to the west and east of the town of Potenza, whereas the Latronico slide is located close to the town of Latronico. Electrical images are produced from dipole-dipole geoelectric data acquired along arrays spanning selected profiles positioned perpendicular and parallel to the landslide bodies. High-resolution electrical resistivity images are attained through the use of geologic and borehole constraints in the interpretation phase. Integration and comparison of our results with other geophysical data delineate the geometries and hydrologic characteristics of the landslide structures.
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Tài liệu tham khảo
Bonardi G., 1988, Memorie della Società Geologica Italiana, 41, 17
Canuti P., 2002, GeoItalia, 9, 9
Cruden, D. M., and D. J. Varnes, 1996, Landslide types and processes, in A. K. Turner, and R. L. Schuster, eds., Landslides — Investigation and mitigation: U.S. National Research Council, Transportation Research Board Special Report 247, 36–75.
Curcetti, C., 1996, Franosità pregressa ed attuale dell'alta Valle del fiume Basento: la frana di Varco d'Izzo (Past and present landslides of the high valley of the Basento River): Tesi di Laurea in Ingegneria, Università degli Studi della Basilicata.
Di Nocera, S., S. Lazzari, T. Pescatore, and M. Tramutoli, 1988, Aspetti geologici e geotecnici dell'area urbana di Potenza (Geological and geotechnical features of the urban area of Potenza): Memorie della Società Geologica Italiana, 41, 373–390.
Gallipoli M., 2000, European Journal of Environmental and Engineering Geophysics, 4, 117
Giano S. I., 2000, Annali di Geofisica, 43, 409
Gullà, G., and F. Sdao, 2001, Dissesti prodotti o aggravati dal sisma del 9 Settembre 1998 nel territorio del confine Calabro-Lucano (Accidents induced or related to the 9 September 1998 earthquake in the Calabro-Lucano border zone): Monografia del Gruppo Nazionale Difesa Catastrofi Idrogeologiche, Cnr–U.O. 2.56: Pubbl. N. 2121 del Catalogo Pubblicazioni del GNDCI, Cnr.
Loke, M. H., 1999, RES2DINV, v. 3.42, geoelectrical imaging 2D & 3D software user manual.
Melidoro, G., 1977, Relazione geologica sul movimento franoso del 1976 in località Giarrossa (Comune di Potenza) (Geological report about the landslide that occurred in Giarrossa village(Potenza) in 1976): Regione Basilicata, Ufficio Genio Civile di Potenza.
Nakamura, Y., 1989, A method for dynamic characteristics estimation of subsurface using microtremor on the ground surface: Quarterly Report of the Railway Technical Research Institute, 30, 25–33.
Pieri, P., L. Sabato, S. Loiacono, and M. Marino, 1994, Il bacino di piggy-back di Sant'Arcangelo: Evoluzione tettonico-sedimentaria: (The Sant'Arcangelo piggy-back basin: Tectonic-sedimentary evolution) Bollettino della Società Geologica Italiana, 113, 465–481.
Timoran project, 2001, Final report of POP-FESR program (1997–1999), funded by the Basilicata Region.