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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Fault activity and palaeoseismicity during Quaternary time in Scotland

Ringrose, Philip S. January 1987 (has links)
Field study at seven Scottish sites has resulted in the following evidence for late- and post-glacial earthquakes and fault movements. a) Glen Roy, western Highlands: Earthquake-induced deformation structures are observed in 10,000 year-old lake deposits, and can be related to a surface fault rupture and several landslides. The deformation structures have been mapped over an area of 100 sq. km and display most intense deformation in a central area, with decreasing degrees of deformation in peripheral zones. This zonation is interpreted in terms of varying intensities of ground-shaking during a major earthquake. The field data indicate a magnitude 6.25 event. b) Kinloch Hourn, western Highlands: A prominent, 14-km long fault displays evidence for recurrent movement. A magnitude 5.5-6.0 event occurred between 3500 and 2400 years ago, and unquantified movement has occurred since then. c Firth of Lorn (west coast): Levelling survey, at two sites, indicates several vertical displacements of up to 3m, of a 10,000 year old raised shoreline. d) Lismore (west coast): Lateral fault displacements of c. 0.5m have disrupted present rock and soil morphology and indicate movement in the last few thousand years. e Tayside, eastern Scotland: Two sites display soft-sediment deformation structures in late-glacial sands and silts. The structures are interpreted as the result of (unquantified) earthquake ground-shaking. This field evidence is collectively evaluated in terms of crustal stress, earthquake recurrence and present-day earthquake hazard. Earthquakes as large as magnitude 7 are thought to have occurred but were probably triggered by glacial rebound stesses. Earthquakes upto magnitude 6 have certainly occurred, some as recently as 3000 years ago, and are likely to recur. Present-day surface fault displacements of up to 0.1m are considered likely on fractures favourably orientated with respect to the present-day stress field.

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