The São Vicente earthquake of 2008 April and seismicity in the continental shelf off SE Brazil: Further evidence for flexural stresses

Geophysical Journal International

Volumn 187, Issue 3, 2011, Pages 1076-1088

  Assumpcao M ^a   Dourado, J C ^b   Ribotta, L C ^c   Mohriak, W U ^d   Dias, Fábio L ^a   Barbosa, J R ^a  

^a UNIVERSITY OF SÃO PAULO   (Brazil)

^b SÃO PAULO STATE UNIVERSITY UNESP   (Brazil)

^c Instituto de Pesquisas Tecnologicas   (Brazil)

^d PETROBRAS   (Brazil)

Author keywords

Earthquake source observations; Intra plate processes; Lithospheric flexure; Seismicity and tectonics; South America

Indexed keywords

CONTINENTAL MARGIN; CONTINENTAL SHELVES; CONTINENTAL SLOPE; EARTHQUAKE SOURCE; FAULT MECHANISM; FLEXURAL EFFECTS; FLEXURAL STRESS; FOCAL DEPTH; FOCAL MECHANISM; HYPOCENTRE; INTRA-PLATE PROCESSES; LARGE DIP; LITHOSPHERIC FLEXURE; LOWER CRUST; MOMENT TENSOR INVERSION; PRINCIPAL STRESS; RECENT SEDIMENTATION; REVERSE FAULTING; RIO GRANDE DO SUL; SEISMIC ACTIVITY; SEISMIC ZONES; SOUTH AMERICA; TELESEISMIC DISTANCES;

ANOXIC SEDIMENTS; FOCUSING; TECTONICS;

EARTHQUAKES;

CONTINENTAL MARGIN; CONTINENTAL SHELF; EARTHQUAKE EVENT; EARTHQUAKE HYPOCENTER; EARTHQUAKE MAGNITUDE; FLEXURE; FOCAL MECHANISM; INTRAPLATE PROCESS; LITHOSPHERIC STRUCTURE; LOWER CRUST; MOMENT TENSOR; REVERSE FAULT; SEISMIC SOURCE; SEISMIC ZONE; SEISMICITY; TECTONICS;

BRAZIL; SAO PAULO [BRAZIL]; SAO VICENTE;

EID: 81555209056     PISSN: 0956540X     EISSN: 1365246X     Source Type: Journal    
DOI: 10.1111/j.1365-246X.2011.05198.x     Document Type: Article

References (48)

1. Allmann, B.P. & Shearer, P.M., 2009. Global variations of stress drop for moderate to large earthquakes, J. geophys. Res., 114, B01310, doi:.
2. Assumpção, M., 1983. A regional magnitude scale for Brazil, Bull. seism. Soc. Am., 73, 237-246.
3. Assumpção, M., 1998a. Seismicity and stresses in the Brazilian passive margin, Bull. seism. Soc. Am., 88(1), 160-169.
4. Assumpção, M., 1998b. Focal mechanisms of small earthquakes in SE Brazilian shield: a test of stress models of the South American plate, Geophys. J. Int., 133, 490-498.
5. Assumpção, M. & Suárez, G., 1988. Source mechanisms of moderate-size earthquakes and stress orientation in mid-plate South America, Geophys. J., 92, 253-267.
6. Barcelos, A., Assumpção, M. & Pirchiner, M., 2010. Magnitude determination of regional earthquakes in Brazil: a comparison of the new IASPEI magnitude formulas, EOS, Trans. AGU, 91(26), Meeting Supplement, Abstract, Iguassu Falls, Brazil, 2010 August 8-13.
7. Bent, A.L., 1995. A complex double-couple source mechanism for the Ms 7.2 1929 Grand Banks earthquake, Bull. seism. Soc. Am., 85, 1003-1020.
8. Berrocal, J., Fernandes, C., Bassini, A. & Barbosa, J.R., 1996. Earthquake hazard assessment in southeastern Brazil, Geofís. Int., 35, 257-272.
9. Bondár, I., Myers, S.C., Engdahl, E.R. & Bergman, E.A., 2003. Epicentre accuracy based on seismic network criteria, Geophys. J. Int., 156, 483-496.
10. Brune, J., 1970. Tectonic stress and spectra of seismic shear waves from earthquakes, J. geophys. Res., 75, 4997-5009. [Correction, 1971J. geophys. Res., 76, 5002].
11. Bueno, G.V., 2004. Diacronismo de eventos no rifte Sul-Atlântico, Bol. Geoc. Petrobras, Rio de Janeiro, 12(2), 203-229.
12. Bueno, G.V., Machado, D.L., Jr, Oliveira, J.A.B. & Marques, E.J.J., 2004. A influência do Lineamento de Capricornio na evolução tectono-sedimentar da bacia de Santos. Abstracts, 42nd Brazilian Geological Congress, Araxá, MG, Brazil.
13. Bungum, H., Olesen, O., Pascal, C., Gibbons, S., Lindholm, C. & Vestøl, O., 2010. To what extent is the present seismicity of Norway driven by postglacial rebound? J. Geol. Soc. Lond., 167, 373-384.
14. Carminatti, M., Wolff, B. & Gamboa, L.A.P., 2008. New exploratory frontiers in Brazil, in Proceedings of the 19th World Petroleum Congress, Madrid, Spain, Abstracts CD, 11 pp.
15. Chang, H.K., 2003. Mapeamento e Interpretação dos Sistemas Petrolíferos da Bacia de Santos, (accessed in 2011 February 16).
16. Chang, H.K., Kowsman, R., Figueiredo, A.M.F. & Bender, A.A., 1992. Tectonics and stratigraphy of the east Brazil rift system: an overview, Tectonophysics, 213, 97-138.
17. Cloetingh, S.A.P.L., Wortel, M.J.R. & Vlaar, N.J., 1984. Passive margin evolution, initiation of subduction and the Wilson cycle, Tectonophysics, 109, 147-163.
18. Cloetingh, S.A.P.L., Wortel, M.J.R. & Vlaar, N.J., 1989. On the initiation of subduction zones. Pageoph, 129, 7-25.
19. Cobbold, P.R., Szatmari, P., Demercian, L.S., Coelho, D. & Rossello, E.A., 1995. Seismic experimental evidence for thin-skinned horizontal shortening by convergent radial gliding on evaporites, deep-water Santos Basin, AAPG Memoir, 65, 305-321.
20. Dourado, J.C. & Assumpção, M., 2010. The 5.2 mb São Vicente earthquake of 2008 in the continental shelf off SE Brazil: using reflection seismic sections to constrain the fault plane, AGU Meeting of the Americas, Iguassu Falls, Brazil, 2010 August 8-13, Abstract.
21. Dourado, J.C., & Assumpção, M., 2011. The 5.2 mb São Vicente earthquake of 2008 in the continental shelf off SE Brazil: using reflection seismic sections to constrain the fault plane, Rev. Bras. Geofísica, submitted (in Portuguese).
22. Dreger, D.S., 2003. TDMT-INV: time domain seismic moment tensor inversion, in International Handbook of Earthquake and Engineering Seismology, Vol. 81B, p. 1627, Academic Press, London.
23. Driscoll, N.W. & Karner, G.D., 1994. Flexural deformation due to Amazon Fan loading: a feedback mechanism affecting sediment delivery to margins, Geology, 22, 1015-1018, doi:.
24. Feng, M., Van der Lee, S. & Assumpção, M., 2007. Upper mantle structure of South America from joint inversion of waveforms and fundamental-mode group velocities of Rayleigh waves, J. geophys. Res., 112, B04312, doi:.
25. Gomes, B.S., 1992. Preliminary integration of marine gravimetric data of Petrobras and Leplac project: Campos, Santos and Pelotas basins, in Proceedings of the 37th Brazilian Geological Congress, 1, 559-560, São Paulo, SP, Brazil (in Portuguese).
26. Gomes, P.O., Kilsdonk, B., Minken, J., Grow, T. & Barragan, R., 2008. The outer high of the Santos Basin, Southern São Paulo Plateau, Brazil: pre-salt exploration outbreak, palaeogeographic setting, and evolution of the syn-rift structures, AAPG International Conference and Exhibition, Cape Town, South Africa, 2008 October 26-29, Abstracts CD, (last accessed 2011 September 17).
27. Hasegawa, H.S. & Herrmann, R.B., 1989. A comparison of the source mechanism of the 1975 Laurentian Channel earthquake and the tsunamigenic 1929 Grand Banks event, in Earthquakes at North-Atlantic Passive Margins: Neotectonics and Postglacial Rebound, pp. 547-562, eds Gregersen, S. & Basham, P.W., Kluwer Academic, Boston, MA.
28. Hasegawa, H.S & Kanamori, H., 1987. Source mechanism of the magnitude 7.2 Grand Banks earthquake of November 1929: double couple or submarine landslide? Bull. seism. Soc. Am., 77, 1984-2004.
29. ISC, 2011. International Seismological Centre, On-line Bulletin, (last accessed 2011 September 17).
30. Johnston, A.C., 1989. The seismicity of stable continental interiors, in Earthquakes at North-Atlantic Passive Margins: Neotectonics and Postglacial Rebound, pp. 299-327, eds Gregersen, S. & Basham, P.W., Kluwer Academic, Boston, MA.
31. Johnston, A.C. & Kanter, L.R., 1990. Earthquakes in stable continental crust, Sci. Am., 262, 68-75.
32. Kwitko, R. & Assumpção, M., 1990. Modelo de velocidades para o manto superior no Brasil e determinação de epicentros regionais, in Proceedingsof the 36th Congr. Bras. Geol., Natal, RN, 5, pp. 2464-2469.
33. Mendiguren, J.A. & Richter, F.M., 1978. On the origin of compressional intraplate stresses in South America, Phys. Earth planet. Inter., 16, 318-326.
34. Minson, S.E. & Dreger, D.S., 2008. Stable inversions for complete moment tensors, Geophys. J. Int., 174, 585-592, doi:.
35. Mohriak, W.U., 2001. Salt tectonics, volcanic centers, fracture zones and their relationship with the origin and evolution of the South Atlantic Ocean: geophysical evidence in the Brazilian and West African margins, in Proceedings of the 7th Internaional Congress of the Brazilian Geophysical Society, Salvador, Bahia, Brazil, 2001 October 28-31, Expanded Abstract, pp. 1594-1597.
36. Mohriak, W.U., 2004. Recursos energéticos associados à ativação tectônica mesozóico-cenozóica da América do Sul, in Geologia do Continente Sul-Americano: Evolução da Obra de Fernando Flávio Marques de Almeida, Vol. XVIII, pp. 293-318, eds Mantesso-Neto, V. Bartorelli, A., Carneiro, C.D.R. & Brito-Neves, B.B., Beca Produções Culturais Ltd., São Paulo.
37. Mohriak, W.U. et al., 1995. Salt tectonics and structural styles in the deep-water province of the Cabo Frio region, Rio de Janeiro, Brazil, AAPG Memoir, 65, 273-304.
38. Mohriak, W.U., Nemcok, M. & Enciso, G. 2008. South Atlantic divergent margin evolution: rift-border uplift and salt tectonics in the basins of SE Brazil, Geol. Soc. Lond. Spec. Pub., 294, 365-398.
39. Mohriak, W.U., Nóbrega, M. Odegard, M.E., Gomes, B.S. & Dickson, W.G., 2010. Geological and geophysical interpretation of the Rio Grande Rise, south-eastern Brazilian margin: extensional tectonics and rifting of continental and oceanic crusts, Pet. Geosci., 16, 231-245. doi:.
40. Rocha, M.P. Schimmel, M. & Assumpção, M., 2011, Upper-mantle seismic structure beneath SE and Central Brazil from P- and S-wave regional traveltime tomography, Geophys. J. Int., 184, 268-286, doi:.
41. Riccomini, C. & Assumpção, M., 1999. Quaternary tectonics in Brazil. Episodes, 22(3), 221-225.
42. Schulte, S.M. & Mooney, W.D., 2005. An updated global earthquake catalogue for stable continental regions: reassessing the correlation with ancient rifts. Geophys. J. Int., 161, 707-721.
43. Stein, S., Cloetingh, S., Sleep, N.H. & Wortel, R., 1989. Passive margin earthquakes, stresses and rheology, in Earthquakes at North-Atlantic Passive Margins: Neotectonics and Postglacial Rebound, pp. 231-259, eds Gregersen, S. and Basham, P.W., Kluwer Academic, Boston, MA.
44. Sykes, L., 1978. Intraplate seismicity, reactivation of pre-existing zones of weakness, alkaline magmatism, and other tectonism postdating continental fragmentation, Rev. geophys. Space Phys., 16, 621-688.
45. Watts, A.B., Rodger, M., Peirce, C., Greenroyd, C.J. & Hobbs, R.W., 2009. Seismic structure, gravity anomalies, and flexure of the Amazon continental margin, NE Brazil, J. geophys. Res., 114, B07103, doi:.
46. Zalán, P.V., Severino, M.C.G., Oliveira, J.A.B., Magnavita, L.P., Mohriak, W.U., Gontijo, R.G., Viana, A.R. & Szatmari, P., 2009. Stretching and thinning of the upper lithosphere and continental-oceanic crustal transition, AAPG International Conference & Exhibition, 2009 November 15-18, Abstracts Volume, 653274.
47. Zoback, M.L, 1992. Stress field constraints on intraplate seismicity in Eastern North America, J. geophys. Res., 97, 11761-11782.
48. Zoback, M.L. & Richardson, R.M., 1996. Stress perturbation associated with the Amazonas and other ancient continental rifts, J. geophys. Res., 101, 5459-5475.