The S reflector west of Galicia: The seismic signature of a detachment fault

Geophysical Journal International

Volumn 127, Issue 1, 1996, Pages 230-244

  Reston, T J ^a  

^a GEOMAR HELMHOLTZ CENTRE FOR OCEAN RESEARCH KIEL   (Germany)

Author keywords

Acoustic impedance; Continental margin; Fault tectonics; Galicia bank; Rifts; Seismic reflection

Indexed keywords

CONTINENTAL MARGINS; DETACHMENT FAULT; FAULTS; RIFTED MARGIN; RIFTING; SEISMIC REFLECTION;

ATLANTIC, GALICIA MARGIN;

EID: 0030435485     PISSN: 0956540X     EISSN: None     Source Type: Journal    
DOI: 10.1111/j.1365-246X.1996.tb01547.x     Document Type: Article

References (44)

1. Anstey N., 1986. Field Techniques for high resolution, The Leading Edge, 5, 26-34.
2. Banda, E., Torné, M. & Iberia Atlantic Margins Group, 1995. Iberian Atlantic Margins Group investigates deep structure of ocean margins, EOS, Trans. Am. geophys. Un., 76, 25-29.
3. Barnes, A., 1991. Instantaneous frequency and amplitude of the envelope peak of a constant-phase wavelet, Geophysics, 56, 1058-1060.
4. Barnes, A. & Reston, T., 1992. A study of two mid-crustal bright spots from southeast Georgia (USA), Geophys. J. Int., 108, 683-691.
5. Båth, M.O., 1974. Spectral Analysis in Geophysics, Elsevier, Amsterdam.
6. Boillot, G., Comas, M.C., Girardeau, J., Kornprobst, J., Loreau, J.P., Malod, J., Mougenot, D. & Moullade, M., 1988a. Preliminary results of the Galinaute cruise: dives of the submersible Nautile on the western Galicia margin, Spain, in Proc. ODP, Sci. Results, 103, eds Boillot, G., Winterer, E.L., College Station, TX (Ocean Drilling Program), 37-51.
7. Boillot, G., Girardeau, J. & Kornprobst, J., 1988b. The rifting of the Galicia margin: crustal thinning and emplacement of mantle rocks on the seafloor, in Proc. ODP, Sci. Results, 103, eds Boillot, G., Winterer, E.L., College Station, TX (Ocean Drilling Program), 741-756.
8. Boillot, G., Féraud, G., Recq, M. & Girardeau, J., 1989. 'Undercrusting' by serpentinite beneath rifted margins: the example of the west Galicia margin (Spain), 341, 523-525.
9. Boillot, G., Beslier, M.-O., Krawczyk, C., Rappin, D. & Reston, T., 1995. The formation of a passive margin: constraints from the crustal structure and segmentation of the deep Galacia margin, Geol. Soc. Lond. Spec. Publ., 90, 71-91.
10. Bown, J. & White, R.S., 1995. Finite duration rifting, melting and subsidence at continental margins, in Rifted Ocean-Continent Boundaries, eds Banda, E., Torné, M. & Talwani, M., Kluwer NATO-ASI Series, 463, 31-54.
11. Braile, L., 1977. The Earth's Crust, AGU Monograph Series 20, AGU, Washington, DC.
12. de Charpal, O., Guennoc, P., Montadert, L. & Roberts, D.G., 1978. Rifting, crustal attenuation and subsidence in the Bay of Biscay, Nature, 275, 706-711.
13. Flueh, E.R. & Okaya, D., 1988. Near-vertical and intermediate offset seismic reflection data from west of the Whipple Mountains, SE California, J. geophys. Res., 94, p. 625-636.
14. Goodwin, E., Thompson, G. & Okaya, D., 1989. Seismic identification of basement reflectors: the Bagdad reflection sequence in the Basin and Range province-Colorado transition zone, Arizona, Tectonics, 8, 821-831.
15. Henyey, T., Okaya, D., Frost, E. & McEvilly, T., 1987. CALCRUST (1985) seismic reflection survey, Whipple Mountains detachment terrane, California: an overview, Geophys. J. R. astr. Soc., 89, 111-118.
16. Hobbs, R., 1990. Effective Q determination using frequency methods on BIRPS data, Tectonophysics, 173, 25-30.
17. Hoffmann, H.J. & Reston, T.J., 1992. The nature of the S reflector beneath the Galicia Bank rifted margin. Preliminary results from pre-stack depth migration, Geology, 20, 1091-1094.
18. Horsefield, S., 1992. Crustal Structure across the Continent-Ocean Boundary, PhD thesis, Cambridge University, UK.
19. Jackson, J., 1987. Active normal faulting and crustal extension, Geol. Soc. Lond. Spec. Publ., 28, 3-17.
20. Juhlin, C., 1990. Interpretation of the reflections in the Siljan Ring area based on results from Gravberg-1 borehole, Tectonophysics, 173, 345-360.
21. Klaeschen, D., 1995. Strahlenseismische Modellierung unter Berücksichtigung von Mehrfach-diffractionen mit Hilfe der Edge-Waves: Theorie und Anwendungsbeispiele, PhD thesis, Christian-Albrechts University, Kiel.
22. Litak, R. & Hauser, E., 1992. The Bagdad Reflection Sequence as tabular mafic intrusions: evidence from seismic modelling of mapped exposures, Geol. Soc. Am. Bull., 104, 1315-1325.
23. Matheney, M. & Nowack, R., 1995. Seismic attenuation values obtained from instantaneous frequency matching and spectral ratios, Geophys. J. Int., 123, 1-15.
24. Mauffret, A. & Montadert, L., 1987. Rift tectonics on the passive continental margin off Galicia (Spain), Mar. Pet. Geol., 40, 49-70.
25. Montadert, L., de Charpal, O., Roberts, D., Guennoc, P. & Sibuet, J., 1979. Northeast Atlantic passive continental margin: rifting and subsidence processes, in Talwani, M. & Ryan, W., eds, Deep Drilling Results in the Atlantic Ocean: Continental Margin and Paleoenvironment, M. Ewing Ser. 3, 154-186.
26. Newman, P., 1973. Divergence effects in a layered earth, Geophysics, 38, 481-488.
27. Pratt, T., Hauser, E., Hearn, T. & Reston, T., 1991. Reflection polarity of the midcrustal surrency bright spot beneath southeastern Georgia: testing the fluid hypothesis, J. geophys. Res., 96B, 10 145-10 158.
28. Reston, T.J., 1987. Spatial interference, reflection character and the structure of the lower crust under extension: results from 2-D seismic modelling, Ann. Geophys., 5B, 339-348.
29. Reston, T.J., Krawczyk, C.M. & Hoffmann, H.-J., 1995. Detachment tectonics during Atlantic rifting: analysis and interpretation of the S reflection, the west Galicia margin, Geol. Soc. Lond. Spec. Publ., 90, 93-109.
30. Reston, T.J., Krawczyk, C.M. & Klaeschen, D., 1996. The S reflector west of Galicia: results of prestack depth migration - detachment faulting during continental breakup, J. geophys. Res., 101, 8075-8091.
31. Robertson, J. & Nogami, H., 1984. Complex seismic trace analysis of thin beds, Geophysics, 49, 344-352.
32. Sheriff, R., 1977. Limitations on resolution of seismic reflections and geologic detail derivable from them, A.A.P.G. Memoir, 26, 3-14.
33. Sheriff, R. & Geldart, L., 1982. Exploration Seismology, Vol. 1, Cambridge University Press, Cambridge.
34. Shipboard Scientific Party, 1987. Section 3: Site Reports, in Proc. O.D.P., Mt. Reports, 103, eds Boillot, G., Winterer, E.L., College Station, TX (Ocean Drilling Program), 123-649.
35. Sibuet, J.C., 1992. New constraints on the formation of the nonvolcanic continental Galicia - Flemish Cap conjugate margins, J. geol. Soc. Lond., 149, 829-840.
36. Sibuet, J.C., Louvel, V., Whitmarsh, R., White, R., Horsefield, S, Sichler, B. & Recq, M., 1995. Constraints on rifting processes from refraction and deep-tow magnetic data: the example of the Galicia continental margin (west Iberia), in Rifted Ocean-Continent Boundaries, eds Banda, E., Torné, M. & Talwani, M., Kluwer NATO-ASI Series, 463, 197-217.
37. Taner, M. & Sheriff, R., 1977. Application of amplitude frequency and other attributes to stratigraphic and hydrocarbon determination, AAPG Mem., 26, 301-327.
38. Wang, C., Okaya, D., Ruppert, C., Davis, G., Guo, T., Zhong, Z. & Wenk, H.-R., 1989. Seismic reflectivity of the Whipple Mountain Shear Zone in southern California, J. geophys. Res., 94, 2989-3005.
39. Warner, M., 1990. Absolute reflection coefficients from deep seismic reflections, Tectonophysics, 173, 15-23.
40. Wernicke, B. & Burchfiel, B.C., 1982. Modes of extensional tectonics, J. Struct. Geol., 4, 105-115.
41. White, R.E., 1991. Properties of instantaneous seismic attributes, The Leading Edge, 10(7), 26-32.
42. Whitmarsh, R.B., White, R.S., Horsefield, S., Sibuet, J.-C, Recq, M. & Louvel, V., 1996. The ocean-continent boundary off the western continental margin of Iberia, III. Crustal structure west of Galicia Bank. J. geophys. Res., in press.
43. Widess, M., 1973. How thin is a thin bed? Geophysics, 38, 1176-1180.
44. Winterer, E., Gee, J. & van Waasbergen, R., 1988. The source area for lower Cretaceous clastic sediments of the Galicia margin: geology and tectonic and erosional history, in Proc. ODP, Sci. Results, 103, eds Boillot, G., Winterer, E.L., College Station, TX (Ocean Drilling Program), 697-732.