Abstract
The Kinloch Hourn fault is the most prominent of a number of suspectedpostglacial faults in the western Scottish Highlands. These faults areinterpreted to have been reactivated by repeated large (M > 6)palaeoseismic events following deglaciation 10,000–13,000 years ago.Based on inferred deflections of drainage courses, previous studies of thefault have estimated 160 ± 40 m cumulative left-lateral displacementalong a 14 km long active segment during postglacial times. Reportedsoft-sediment deformation phenomena imply that activity on the KinlochHourn fault has persisted into the late Holocene, with the most recentmovement having been associated with a magnitude 5.5–6.0 surface-faultingevent between 3500 and 2400 years ago. The marked contrast betweensuch palaeoseismic activity and the present-day seismic quiescence ofwestern Scotland has stimulated this critical reappraisal of the KinlochHourn fault.This paper reassesses the key lines of evidence for postglacial fault activityand palaeoseismicty on the Kinloch Hourn fault, combining the analysis of1:15,000-scale air photos, field-based geomorphic mapping andpalaeoenvironmental investigations. Our reappraisal of inferred drainagedeflections across the fault contends that previous reports of significant(102 m) left-lateral slip on the fault during the Holocene arespurious. Instead, incidences of Holocene channel abandonment along thefault line are non-synchronous and probably reflect non-tectonic drainagechanges. The timing of soft-sediment deformation in the vicinity of the faultis revised to an early Holocene date (8990–8580 calendar years BP), whichis in accord with both the palaeoenvironmental history of the site andconsistent with published ages of earthquake-induced liquefactionphenomena documented elsewhere in western Scotland. An alleged recent(post-2400 radiocarbon years BP) ground rupture on the fault isquestioned in the light of uncertainty about both the nature of the faultedsoil deposit and the late Holocene age attributed to it.The study concludes that there is no convincing evidence for postglacialsurface rupture on the Kinloch Hourn fault and speculates that the casefor significant (101–102 m) postglacial movement on otherfaults in western Scotland may be similarly `unproven'.
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References
Adams, J., 1989, Postglacial faulting in eastern Canada: nature, origin and seismic-hazard implication, Tectonophysics 163, 323–331.
Alonso, V. and Corte, A.E., 1992, Postglacial fracturing in the Cantabrian Cordillera (NW Spain), Zeitschrift für Geomorphologie 36, 479–490.
Assumpcao, M., 1981, The NW Scotland earthquake swarm of 1974, Geophys. J. Royal Astr. Soc. 67, 577–586.
Bennett, M.R. and Boutton, G.S., 1993, Deglaciation of the Younger Dryas or Loch Lomond Stadial ice-field in the northern Highlands, Scotland, Journal of Quaternary Science, 8, 133–145.
Birks, H.J.B, 1977, The Flandrian forest history of Scotland: a preliminary synthesis, In: Shotton F.W. (ed.), British Quaternary studies: Recent advances, Claredon Press, Oxford, pp. 119–135.
Birks, H.J.B. and Williams, W., 1983, Late Quaternary vegetation history of the Inner Hebrides, Proc. Royal Society of Edinburgh 83, pp. 269–292.
Davenport, C.A. and Ringrose, P.S., 1985, fault activity and palaeoseismicity during Quaternary time in Scotland – preliminary studies, In: Earthquake Engineering in Britain, Thomas Telford Ltd., London, pp. 143–155.
Davenport, C.A. and Ringrose, P.S., 1987, Deformation of Scottish Quaternary sediment sequences by strong earthquake motions, In: Jones, M.E. and Preston, R.M.F. (eds), Deformation of Sediments and Sedimentary Rocks, Geological Society Special Publication 29, pp. 299–314.
Davenport, C.A., Lap, J.M.J., Maurenbrecher, P.M. and Price, D.G., 1994, Liquefaction potential and dewatering injection structures at Herkenbosch: field investigations of the effects of the 1992 Roermond earthquake, the Netherlands, Geologie en Mijnbouw 73, 365–374.
Davenport, C.A., Ringrose, P.S., Becker, A., Hancock, P.L. and Fenton, C., 1989, Geological investigation of late and post glacial earthquake activity in Scotland, In: Gregersen, S. and Basham, P. (eds), Earthquakes at North-Atlantic Passive Margins: Neotectonics and Postglacial Rebound, Kluwer, Dordrecht, pp. 175–194.
Dehls, J.F., Olesen, O., Olsen, L. and Harald Blikra, L., 2000, Neotectonic normal faulting in northern Norway: the Stuoragurra and Nordmannvikdalen postglacial faults, Quat. Sci. Rev 19, 1447–1460.
Ego, F., Sebrier, M., Carey-Gailhardis, E. and Beate, B., 1996, Do the Billecocha normal faults (Ecuador) reveal extension due to lithospheric body forces in the northern Andes? Tectonophysics 265, 255–273.
Fenton, C.H., 1991, Neotectonics and Palaeoseismicity in North West Scotland, Unpublished Ph.D. thesis, University of Glasgow, 403 pp.
Fenton, C.H., 1992a, Postglacial faulting in Scotland: An overview, In: Fenton, C.H. (ed.) Neotectonics in Scotland: A field Guide, University of Glasgow, pp. 4–15.
Fenton C.H., 1992b, Holocene seismotectonic activity in the area of Glen Shiel, In: Fenton, C.H. (ed.), Neotectonics in Scotland: A field guide, University of Glasgow, pp. 61–67.
Fenton, C.H., 1992c, Lateglacial faulting and seismic activity in the area of Coire Dho, Inverness-shire, In: Fenton, C. (ed.), Neotectonics in Scotland: A Field Guide, University of Glasgow, pp. 68–71
Fenton, C., 1994, Postglacial faulting in eastern Canada; an annotated bibliography. Geological Survey of Canada Open-File Report 2774, 98 pp.
Fenton, C.H., 1999, Glacio-isostatic (postglacial) faulting: Criteria for recognition, In: Hanson, K.L., Kelson, K.I., Angell, M.A. and Lettis, W.R. (eds), Identifying faults and Determining Their Origins, U.S. Nuclear Regulatory Commission, NUREG/CR-5503, Appendix A, p. CF1-CF46.
Fenton, C.H. and Ringrose P.S, 1992, Late Quaternary movement along the Kinloch Hourn fault, Inverness-shire, In: Fenton, C.H. (ed.), Neotectonics in Scotland: A Field Guide, University of Glasgow, pp. 54–60.
Firth, C.R. and Stewart, I.S., 2000, Postglacial tectonics of the Scottish glacio-isostatic uplift centre. Quat. Sci. Rev. 19, 1469–1493.
Johnston, P., Wu, P. and Lambeck, K., 1998, Dependence of horizontal stress magnitude on load dimension in glacial rebound models, Geophys. J. Int. 132, 41–60.
Kanamori, H. and Allen, C.R., 1996, Earthquake repeat time and average stress drop, Earthquake Source Mechanics, AGU Geophysical Monograph 37, (Maurice Ewing 6).
Key, R.M., Clark, G.C., May, F., Phiilips, E.R., Chacksfield, B.C. and Peacock, J.D., 1997, Geology of the Glen Roy district, Memoir of the British Geological Survey, Sheet 63W, London, The Stationery Office.
Lagerback, R., 1990, Late Quaternary faulting and palaeoseismicity in northern Fennoscandia, with particular reference to the Lansrav area, northern Sweden, Foreningens I Stockolm Forhamdlingar 112, 333–354.
Lagerback, R., 1992, Dating of late Quaternary faulting in northern Sweden, Journal of the Geological Society, London 149, 285–292.
Lisle, R.J., 1992, New method of estimating regional stress directions: application to focal mechanisms of recent British earthquakes, Geophys. J. Int. 110, 276–282.
Main, I., Irving, Musson, R. and Reading, A., 1999, Constraints on the frequency-magnitude relation and maximum magnitudes in the UK from observed seismicity and glacio-isostatic recovery rates, Geophys. J. Int. 137, 535–550.
Marrow, P.C. and Walker, A.B., 1988, Lleyn earthquake of 1984 July 19: aftershock sequence and focal mechanism, Geophys. J. 92, 487–493.
May, F., Peacock, J.D., Smith, D.I. and Barber, A.J., 1993, Geology of the Kintail district, Memoir of the British Geological Survey, Sheet 72W and part of 71E (Scotland), London, HMSO.
Meghraoui, M., Camelbeeck, T., Vanneste, K., Brondeel, M., Jongmans, D. 2000, Active faulting and paleoseismology along the Bree fault, Lower Rhine graben, Belgium, J. Geophys. Res. 105, 13809–13841.
Mohr, P., 1986, Possible Late Pleistocene faulting in Iar (West) Connacht, Ireland, Geol. Mag. 123, 545–552.
Moore, P.D., Merryfield, D.L. and Price, M.D.R., 1984, The vegetation and development of blanket mires, In: Moore, P.D. (ed.), European Mires, London, Academic Press, pp. 203–235.
Müller, B., Zoback, M.L., Fuchs, K., Mastin, L., Gregersen, S., Pavoni, N., Stephansson, O. and Ljunggren, C., 1991, Regional patterns of tectonic stress in Europe, J. Geophys. Res., 97, 11783–11803.
Muir Wood, R. 1989, Extraordinary deglaciation reverse faulting in northern Fennoscandia, In: Gregersen, S. and Basham, P. (eds), Earthquakes at North-Atlantic Passive Margins: Neotectonics and Postglacial Rebound, Kluwer, Dordrecht, pp. 141–173.
Muir Wood, R., 1993, A review of seismotectonics of Sweden, SKB Technical Report 93–13, 225 pp.
Muir Wood, R., 2000, Deglaciation seismotectonics: a principal influence on intraplate seismogenesis at high latitudes? Quaternary Sci. Rev. 19, 1399–1411.
Musson, R.M.W., 1994, A Catalogue of British Earthquakes, BGS Global Seismology Report No. WL/94/04.
Musson, R.M.W., 1996, The seismicity of the British Isles, Annali di Geofisica 39, 463–469.
Musson, R.M.W., 1998, The Barrow-in-Furness earthquake of 15 February 1865: liquefaction from a very small magnitude event, Pure Appl. Geophys. 152, 733–745.
Peacock, J.D., 1970, Some aspects of the glacial geology of west Inverness-shire, Bulletin of the Geological Survey of Great Britain, 33, 43–56.
Ringrose, P.S., 1989a, Recent fault movement and palaeoseismicity in western Scotland, Tectonophysics 163, 305–314.
Ringrose, P.S., 1989b, Palaeoseismic(?) liquefaction event in the late Quaternary lake sediments at Glen Roy, Scotland, Terra Nova 1, 57–62.
Ringrose, P.S., Hancock, P., Fenton, C. and Davenport, C.A, 1991, Quaternary tectonic activity in Scotland, In: Foster, A., Culshaw, M.G., Cripps, J.C., Little, J.A. and Moon, C.F. (eds), Quaternary Engineering Geology, Geological Society Engineering Geology Special Publication 7, pp. 679–686.
Ritchie, M.E.A. and Walker, A., 1991, Focal mechanisms and the determination of stress directions in western Britain, BGS Technical Report, WL/91/22, 31 pp.
Sébrier, M., Ghafiri, A. and Bles, J.-L., 1997, Paleoseismicity in France: fault trench studies in a region of moderate seismicity, J. Geod. 24, 207–217.
Stephansson, O., 1989, Stress measurements and modelling of crustal rock mechanics in Fennoscandia, In: Gregersen, S. and Basham, P. (eds.), Earthquakes at North-Atlantic Passive Margins: Neotectonics and Postglacial Rebound, Kluwer, Dordrecht, pp. 213–230.
Stewart, I.S., Sauber, J. and Rose, J., 2000, Glacio-seismotectonics: ice sheets, crustal deformation and seismicity, Quat. Sci. Rev. 19, 1367–1389.
Talbot, C.J., 1986, A preliminary analysis of post-glacial faults in N Sweden, SKB Technical Report 86–20, Swedish Nuclear Fuel and Waste Management Co., Stockholm, 36 pp.
Tuttle, M., Law, K.T., Seeber, L. and Jacob, K., 1990, Liquefaction and ground failure induced by the 1988 Saguenay, Quebec, earthquake, Canadian Geotechnical Journal 27, 580–589.
Wells, D.L. and Coppersmith, K.J., 1994, Empirical relationships among magnitude, rupture length, rupture area and surface displacement, Bull. Seism. Soc. Am. 84, 974–1002.
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Stewart, I.S., Firth, C.R., Rust, D.J. et al. Postglacial fault movement and palaeoseismicity in western Scotland: A reappraisal of the Kinloch Hourn fault, Kintail. Journal of Seismology 5, 307–328 (2001). https://doi.org/10.1023/A:1011467307511
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DOI: https://doi.org/10.1023/A:1011467307511