Spatial magnitude-frequency index of mass movements in the humid tropics

Autores/as

  • Antonio C. Colangelo Universidade de São Paulo. Faculdade de Filosofia, Letras e Ciências Humanas. Departamento de Geografia
  • Olga Cruz Universidade de São Paulo. Faculdade de Filosofia, Letras e Ciências Humanas. Departamento de Geografia

DOI:

https://doi.org/10.11606/issn.2179-0892.geousp.2000.123479

Palabras clave:

Mass m ovem ents, magnitude-frequency, spatial quantification, risk áreas

Resumen

The Ahnert's (1987) sem ilogarithm ic approach was adapted and applied directly in slump units deposits and scars m apped in airphotos. In this case, the magnitude-frequency index refers to the "Sp atial Recurrence Interval" (SRI: in Km 2 ) or "Spatial Frequency" (SF: in Events / Km 2) of deposits and scars of varying magnitudes (Dep or DSc in: m2). For migmatite parent m aterial area with steeps slops, the equation results: Dep (m 2) = 4558.Ln(SRI) + 10315. For tertiary parent m aterial area with smooth relief, m oderate gradients, the equation results: Dep (m 2) = 1 5 132.Ln(SRI) + 19106. The "dom inant mass movem ent event" is the event with the m ajor product of magnitude for freqüêncy and that contribute with the bigger total amount of surface affected: deposits and scars. In the two areas referred above the dom inant events have deposits sufaces with, respectively: 4558m 2 and 15132m2. In the sam e way, the spatial frequency of ocurrence are respectively: 3,54 Events/Km 2 (SRI = 0,282 Km 2) and 1,30 Events/Km 2 (SRI = 0,769 Km 2). Under the light of these prelim inary results it seem s to there is a com pensation m echanism related to a possible clim atic constant that constrain the behavior of spatial m agnitude-frequency of this kind of events in the humid tropics

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Biografía del autor/a

  • Antonio C. Colangelo, Universidade de São Paulo. Faculdade de Filosofia, Letras e Ciências Humanas. Departamento de Geografia

    Departamento de Geografia, USP

  • Olga Cruz, Universidade de São Paulo. Faculdade de Filosofia, Letras e Ciências Humanas. Departamento de Geografia

    Departamento de Geografia, USP

Referencias

AB'SABER, A.M. 1966 O Domínio dos "Mares de Morros" G e o m o rfo lo g ia , São Paulo, IGEOG-USP, n° 2, 9p.

AHMERT, F. 1987 An Approach to the Identification of Morphoclimates, in Gardner V., International Geomorphology 1986, pp. 159-188.

ALMEIDA, F.F.M. 1964 Os Fundamentos Geológicos do Relevo Paulista. In Geologia do Estado de São Paulo, Boi. Inst. Geograf. Geol., São Paulo, n° 41, pp. 169-263.

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COLAMGELO, A. C. 1996 O modelo de Feiçòes Mínimas, ou das Unidades Elementares de Relevo: um suporte cartográfico

para mapeamentos geoecológicos, Revista do Departamento de Geografia v.10, São Paulo, USP, pp. 29-40.

COLANGELO, A. C. - 1997 - "Spatial Magnitudefrequency Index of Mass Movement Event deposits in na Humid Tropical Pre-cambrian Plateau, and its Connection with MFI of Daily Rainfall: according to Ahnert's approach " Fourth International Conference on G eom orphology, IAG, Bologna, Italia, p.124.

CROZIER, M & GLADE, T. - 1997 - "Magnitude and Frequency of Landslide Events in Hew Zealand" Fourth International Conference on Geomorphology, IAG, Bologna, Italia, p. 130.

CRUZ, O. 1974 A Serra do Mar e o Litoral na Área de Caraguatatuba-SP, Teses e M onografias, São Paulo. IG-USP, nü 11, 181 p.

DE PLOEY, J. KIRKBY, M. J. & AHNERT, F. - 1991 - Hillslope Erosion by Rainstorms - A Magnitude-Frequency Analysis, Earth Surface Processes and Landform s, vol. 16, pp. 399-409.

Publicado

2000-12-18

Número

Sección

Artigos

Cómo citar

COLANGELO, Antonio C.; CRUZ, Olga. Spatial magnitude-frequency index of mass movements in the humid tropics. GEOUSP Espaço e Tempo (Online), São Paulo, Brasil, v. 4, n. 2, p. 17–27, 2000. DOI: 10.11606/issn.2179-0892.geousp.2000.123479. Disponível em: https://revistas.usp.br/geousp/article/view/123479.. Acesso em: 19 may. 2024.