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Title: A receiver function study of the crust and mantle beneath the British Isles
Author: Davis, M. W.
Awarding Body: University of Cambridge
Current Institution: University of Cambridge
Date of Award: 2010
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A seismic experiment across the British Isles was undertaken to probe the structure of both the crust and mantle in order to constrain the causes of Cenozoic uplift. Seismic data were processed using an iterative deconvolution method to produce receiver functions showing P-to-S conversions from velocity contrasts beneath each seismometer. Data processed for the crust show arrivals of direct conversions and multiples that are consistent with a Moho at around 31 km depth and an average VP/VS ratio of 1.71. The Moho shallows to the northwest of Scotland and southwest of England by ~5 km and deepens to the east of Scotland and beneath Wales by ~4 km. The Moho depths were combined with previous reflection and refraction results to produce a detailed Moho depth map of the entire region. The residual topography increases to the northwest and is attributed to dynamic support from the Icelandic Plume. Migrated receiver functions show considerable similarities of both Moho structure and intra-crustal layering to modelled results of existing controlled-source wide-angle surveys. The crustal dataset allowed both inverse and forward modelling of the receiver functions to resolve crustal velocity structure beneath each seismometer. The velocity models show deep crustal layering beneath areas associated with Early Cenozoic magmatism. The layers correlate with Cenozoic denudation patterns and may be interpreted as magmatic underplating, which caused permanent uplift and resulting denudation.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available