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Publication Date: 2016-10

Journal Title: Earth and Planetary Science Letters

ISSN: 0012-821X

Publisher: Elsevier

Volume: 451

Number: C

Pages: 108-113

Language: English

Type: Article

This Version: AM

Metadata: Show full item record

Citation: Copley, A. C., & Woodcock, N. (2016). Estimates of fault strength from the Variscan foreland of the northern UK. Earth and Planetary Science Letters, 451 (C), 108-113. https://doi.org/10.1016/j.epsl.2016.07.024

Abstract: We provide new insights into the long-standing debate regarding fault strength, by studying structures active in the late Carboniferous in the foreland of the Variscan Mountain range in the northern UK. We describe a method to estimate the seismogenic thickness for ancient deformation zones, at the time they were active, based upon the geometry of fault-bounded extensional basins. We then perform calculations to estimate the forces exerted between mountain ranges and their adjacent lowlands in the presence of thermal and compositional effects on the density. We combine these methods to calculate an upper bound on the stresses that could be supported by faults in the Variscan foreland before they began to slip. We find the faults had a low effective coefficient of friction (i.e. 0.02–0.24), and that the reactivated pre-existing faults were at least 30% weaker than unfaulted rock. These results show structural inheritance to be important, and suggest that the faults had a low intrinsic coefficient of friction, high pore-fluid pressures, or both.

Sponsorship: This work forms part of the NERC- and ESRC-funded project 'Earthquakes without Frontiers', and was partially supported by the NERC grant 'Looking Inside the Continents from Space'.

Identifiers:

External DOI: https://doi.org/10.1016/j.epsl.2016.07.024

This record's URL: https://www.repository.cam.ac.uk/handle/1810/257390



Rights:

Licence:

http://creativecommons.org/licenses/by-nc-nd/4.0/





Autor: Copley, Alexander CharlesWoodcock, Nigel

Fuente: https://www.repository.cam.ac.uk/handle/1810/257390



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