Mapping fine-scale heterogeneities within the continental mantle lithosphere beneath Scotland: Combining active- and passive-source seismology

Asencio, E.; Knapp, J. H.; Owens, Thomas; Helffrich, George

doi:10.1130/0091-7613(2003)031<0477:mfhwtc>2.0.co;2

Cited by 24 publications

(23 citation statements)

References 23 publications

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“…Asencio et al (2003) calculated receiver functions using data from one temporary broad-band seismometer array and two permanent short-period stations located in the north of Scotland. Asencio et al (2003) calculated receiver functions using data from one temporary broad-band seismometer array and two permanent short-period stations located in the north of Scotland.…”

Section: Receiver Functionsmentioning

confidence: 99%

Crustal velocity structure of the British Isles; a comparison of receiver functions and wide-angle seismic data

Champion¹,

White²,

Jones

2006

Geophysical Journal International

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SUMMARY Magmatic underplating at the base of the continental crust is thought to be an important consequence of mantle plume activity. Geochemical evidence supports the hypothesis of underplating beneath the British Tertiary Igneous Province during Palaeocene times, a process that has been invoked to explain at least part of the observed pattern of Cenozoic denudation and consequent offshore deposition. This study uses receiver functions to independently test the results of modelling of four wide‐angle seismic lines across the British Isles, several of which indicate the presence of a lens of high‐velocity material at the base of the crust. This lens has been interpreted as evidence of Palaeogene magmatic underplating. Receiver functions were calculated for three permanent and two temporary three‐component broad‐band seismometers. In order to detect P‐to‐S conversions from intracrustal velocity discontinuities, high frequencies were preserved in the calculation of the receiver functions. Receiver functions were modelled using the delay times of the P‐to‐S converted arrivals only, with constraints on the VP and VP/VS structure imposed from controlled source data. This pragmatic method of interpreting receiver function data agrees well with the results of applying an established inversion technique. Resulting crustal velocity models are broadly consistent with the velocity models from the wide‐angle lines, showing evidence for a four‐layer crust with laterally varying Moho depths of between 33 ± 2.5 km beneath southwest Ireland, 32 ± 2.5 km beneath northern and eastern Ireland, 31 ± 2 km beneath the Isle of Man and 35 ± 3 km beneath northern England. While these velocity models are consistent with the presence of a lower crustal layer, receiver functions are insensitive to the P‐wave velocity structure, and so unfortunately they cannot be used to independently constrain the P‐wave velocity of the lower crust, which is an important diagnostic of the presence of magmatic underplating.

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Section: Receiver Functionsmentioning

confidence: 99%

Crustal velocity structure of the British Isles; a comparison of receiver functions and wide-angle seismic data

Champion¹,

White²,

Jones

2006

Geophysical Journal International

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“…6). The main aims of the deployment were to determine the regional extent of major mantle reflectors beneath Scotland and to examine the relationship between any identified upper mantle reflectors and known Palaeozoic lithospheric-scale structures (Asencio et al, 2003). All twenty-four stations were installed by August 2001 and data was recorded almost continuously (except for a gap of approximately 6 months in 2002) for two-years.…”

Section: Ambient Noise Tomography In the Scottish Highlandsmentioning

confidence: 99%

Seismic interferometry and ambient noise tomography in the British Isles

Nicolson

Curtis

Baptie

et al. 2012

Proceedings of the Geologists' Association

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“…Thus, for example, in studies of the continental crust (e.g., Owens et al, 1984;Zandt and Ammon, 1995) and transition zone discontinuities (e.g., Chevrot et al, 1999;Kind and Vinnik, 1988;Vinnik, 1977), the 1-D analysis has proved to be quite adequate and has yielded valuable information on the characteristics of these structures in different tectonic regimes. The more recent documentation of near-horizontal, anisotropic discontinuities within the continental lithosphere (Asencio et al, 2003;Bostock, 1997Bostock, , 1998Leidig and Zandt, 2003;Park, 1997, 1998;Saul et al, 2000) has opened new avenues for study with regard to both inverse modeling and complementary new information that anisotropy can potentially deliver on subsurface structures and dynamics.…”

Section: -D Inversionmentioning

confidence: 98%

Theory and Observations - Seismology and the Structure of the Earth: Teleseismic Body-Wave Scattering and Receiver-Side Structure

Bostock

2015

Treatise on Geophysics

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Mapping fine-scale heterogeneities within the continental mantle lithosphere beneath Scotland: Combining active- and passive-source seismology

Cited by 24 publications

References 23 publications

Crustal velocity structure of the British Isles; a comparison of receiver functions and wide-angle seismic data

Crustal velocity structure of the British Isles; a comparison of receiver functions and wide-angle seismic data

Seismic interferometry and ambient noise tomography in the British Isles

Theory and Observations - Seismology and the Structure of the Earth: Teleseismic Body-Wave Scattering and Receiver-Side Structure

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