Abstract
Conceptual equations are presented for the net benefits, total risk, and total vulnerability associated with hazard zone occupation. It is shown that, as they are polycausal phenomena, landslides require a more sophisticated approach to this form of analysis than that employed for most other forms of hazard.
Three examples of landsliding are examined. At Cuyocuyo, in the Peruvian Cordillera Oriental, slope instability is virtually inevitable, but human intervention may be disturbing some very fragile natural equilibria. At Calciano, in southern Italy, deforestation has resulted in a mudflow disaster, although man-made factors are not the only causes at work. Finally, in the Valle dell'Orco (also in southern Italy) demographic and agrarian change have aided the partial metamorphosis of the catchment into a large-scale mudflow complex (although the longer-term causes are natural, tectonic ones). These examples illustrate parts of the continuum that extends from dominant natural to dominant anthropogenic causes.
Human intervention has played a key role in stimulating the natural antecedents of landslides occurring in the study areas. It is concluded that risk perception has not been wide enough to promote adequate risk mitigation, in part because of a failure properly to conceive of landslides as polycausal phenomena, in which man-made causes effectively cannot—and should not—be separated from natural ones.
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References Cited
Alexander, D. E., 1982, Differences between “calanchi” and “biancane” badlands in Italy,in R. B. Bryan and A. Yair, eds., Badland geomorphology and pi**: Norwich, U.K., Geobooks, p. 71–87.
Alexander, D. E., 1989, Urban landslides:Prog. Phys. Geogr., v. 13, n. 2, p. 157–191.
Alexander, D. E., 1991, Applied geomorphology and the impact of natural hazards on the built environment:Nat. Hazards, v. 4, n. 1, p. 57–80.
Anderson, H., 1987, Is the Adriatic an African promontory?:Geology, v. 15, n. 3, p. 212–215.
Anon., 1981, Situazione, problemi e prospettive dell'area più colpita dal terremoto del 23 novembre 1980: Portici, Italy, Centro di Specializzazione e Ricerca Economico-Agrarie per il Mezzogiorno, and Turin, Italy, Einaudi, 94 p.
Anon., 1985, La Basilicata che cambia: Note e cifre: Potenza, Italy, Ufficio Statistico della Regione Basilicata, 189 p.
Burton, I., R. W. Kates, and G. F. White, 1978, The environment as hazard: New York, Oxford University Press, 240 p.
Cataudella, M., ed., 1987, Il territorio per immagini: Atlante della Basilicata: Potenza, Italy, Giunta Regionale, Regione Basilicata (folio).
Cello, G., I. Guerra, L. Tortorici, E. Turco, and R. Scarpa, 1982, Geometry of the neotectonic stress field in southern Italy: Geological and seismological evidence:J. Struct. Geol., v. 4, n. 4, p. 385–393.
Ciccacci, S., P. Fredi, E. Lupia Palmieri, and F. Salvini, 1987, An approach to the quantitative analysis of the relations between drainage pattern and fracture trend;in V. Gardiner, ed., International Geomorphology 1986, Part II: Chichester, England, John Wiley & Sons, p. 49–69.
Clapperton, C. M., 1983, The glaciation of the Andes:Quat. Sci. Rev., v. 2, p. 83–155.
Clout, H., M. Blacksell, R. King, and D. Pinder, 1989, Western Europe: Geographical perspectives, 2nd ed.: London, Longman, 224 p.
Corti, P., ed., 1976, Inchiesta Zanardelli sulla Basilicata: Turin, Italy, Einaudi, 175 p.
Costa, J. E., and V. R. Baker, 1981, Surficial geology: Building with the earth; New York, John Wiley & Sons, 498 p.
Costa, J. E., and R. L. Schuster, 1988, The formation and failure of natural dams. Bull.Geol. Soc. Am., v. 100, p. 1054–1068.
Crostella, A., and M. Strocchi, 1969, Geologia e geofisica della zona di Tricarico (Lucania):Boll. Soc. Geol. Ital., v. 88, p. 217–234.
Crozier, M. J., 1986, Landslides: causes, consequences and environment: London, Croom Helm, 252 p.
Davidson, D. A., 1980, Erosion in Greece during the first and second millennia B.C.;in R. A. Cullingford, D. A. Davidson, and J. Lewin, eds., Timescales in geomorphology: Chichester, England, John Wiley & Sons, p. 143–158.
Delano Smith, C., 1979, Western Mediterranean Europe: An historical geography: London, Academic Press, 453 p.
De Rosa, G., and A. Cestaro, eds., 1973, Territorio e società nella storia del Mezzogiorno. Naples, Italy, Guida Editore, 951 p.
Funiciello, R., M. Parotto, F. Salvini, E. Locardi, and D. U. Wise, 1977, Correlazione tra lineamenti rilevate con il metodo “shadow” e assetto tettonico nell'area vulcanica del Lazio:Boll. Geodes. Sci. Affini, v. 36, n. 4, p. 451–470.
Ginsborg, P., 1990, A history of contemporary Italy: Society and politics, 1943–1988: London, Penguin, 586, p.
Hsü, K. J., 1975, Catastrophic debris streams (sturzstroms) generated by rockfalls: Bull.Geol. Soc. Am., v. 86, p. 129–140.
Ippolito, F., B. D'Argenio, T. Pescatore, and P. Scandone, 1975, Structural-stratigraphic units and tectonic framework of the southern Apennines;in C. Squyres, ed., Geology of Italy: Tripoli, Libya, Earth Science Society of the Libyan Arab Republic, p. 317–328.
Judson, S., 1963, Erosion and deposition of Italian stream valleys during historic time:Science, v. 140, p. 898–899.
Judson, S., 1968, Erosion rates near Rome, Italy:Science, v. 160, p. 1444–1446.
Kayser, B., 1964, Studi sui terreni e sull'erosione del suolo in Lucania: Matera, Italy, Fratelli Montemurro Editori, 145 p.
King, R., 1971, Italian land reform: Critique, effects and evaluation:Tijdschr. Econ. Soc. Geogr. v. 62, p. 368–382.
Kojan, E., and J. N. Hutchinson, 1978, Mayunmarca rockslide and debris flow, Peru,in B. Voight, ed., Rockslides and avalanches, Part I: New York, Elsevier, p. 315–361.
Laubacher, G., 1978, Estudio geologico de la region norte del Lago Titicaca:Bol. Inst. Geol. (Estud. Espec.), Lima, Peru, v. 5D, 120 p.
Palmentola, G., L. Casorelli, N. Lo Franco, F. Marchese, L. Pennetta, V. Sigillito, and N. Vignola, 1980, Studio delle condizioni di stabilità di parte dell'alto bacino idrografico del Fiume Basento, in Lucania:Geol. Appl. Idrogeol., v. 15, p. 87–100.
Plafker, G., and G. E. Ericksen, 1978, Nevados Huascarán avalanches, Peru,in B. Voight, ed., Rockslides and avalanches, Part I: New York, Elsevier, p. 277–314.
Plafker, G., and V. R. Eyzaguirre, 1978, Rock avalanche and wave at Chungar, Peru,in B. Voight, ed., Rockslides and avalanches, Part II: New York, Elsevier, p. 269–279.
Satoh, H., 1980, Geomorphology of the central Andes:Bull. Dep. Geogr. Univ. Tokyo, v. 12, p. 1–33.
UNDRO, 1982, Natural disasters and vulnerability analysis: Geneva, Office of the United Nations Disaster Relief Coordinator.
Varnes, D. J., 1978, Slope movement types and processes,in R. L. Schuster, and R. J. Krizek, eds., Landslides: Analysis and control: Washington, D.C., Transportation Research Board, p. 11–33.
Vita-Finzi, C., 1969, The Mediterranean valleys: Geological changes in historical times: London, Cambridge University Press, 140 p.
Wieczorek, G. F., 1986, Debris flows and hyperconcentrated streamflows: Proceedings of the ASCE Conference, Water Forum '86: World Water Issues in Evolution, Long Beach, California, 4–6 August 1986, p. 219–226.
Wise, D. U., R. Funiciello, M. Parotto, and F. Salvini, 1985, Topographic lineament swarms: Clues to their origin from domain analysis of Italy:Bull. Geol. Soc. Am., v. 96, p. 952–967.
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Alexander, D. On the causes of landslides: Human activities, perception, and natural processes. Environ. Geol. Water Sci 20, 165–179 (1992). https://doi.org/10.1007/BF01706160
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DOI: https://doi.org/10.1007/BF01706160