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Geological Society, London, Special Publications; 1987; v. 29; p. 299-314;
DOI: 10.1144/GSL.SP.1987.029.01.23
© 1987 Geological Society of London

Part III Descriptive

Deformation of Scottish Quaternary sediment sequences by strong earthquake motions

Colin A. Davenport & Philip S. Ringrose

Department of Applied Geology, University of Strathclyde, Glasgow G1 1XJ

Deformed Quaternary sand, silt, clay and peat sequences from four localities in Scotland are interpreted as seismites by the deformation history of liquefied, fluidized, slumped, and faulted units, and by comparison with seismites documented elsewhere. Two of the sequences consist of outwash sands and silts, deposited during the recession of the Devension ice cap in the region of Perth. Other deposits consist of glacial sands and interglacial peats in the Western Highlands, and glacio-lacustrine silts in the Glen Roy area; both probably deposited during the late stages of the Loch Lomond Readvance.

Careful evaluation of internal geometries and deformation sequences reveals an intimate association of ball-and-illow, fluidization, dish, load, flame and ‘fault-grading’ structures which are most satisfactorily explained by prolonged ground shaking produced by shallow earthquakes. In some cases, potential fault sources for the inferred earthquakes have been identified.





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