Publications
197 results found
Warner M, 2004, Free water and seismic reflectivity in the lower continental crust, JOURNAL OF GEOPHYSICS AND ENGINEERING, Vol: 1, Pages: 88-101, ISSN: 1742-2132
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- Citations: 14
Tong CH, White RS, Warner MR, 2004, Effects of tectonism and magmatism on crack structure in oceanic crust: A seismic anisotropy study, GEOLOGY, Vol: 32, Pages: 25-28, ISSN: 0091-7613
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- Citations: 9
Tong CH, Thompson MJ, Warner MR, et al., 2003, The significance of density and attenuation in the local helioseismology, ASTROPHYSICAL JOURNAL, Vol: 596, Pages: L263-L266, ISSN: 0004-637X
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- Citations: 7
Tong CH, Thompson MJ, Warner MR, et al., 2003, Helioseismic signals and wave field helioseismology, ASTROPHYSICAL JOURNAL, Vol: 593, Pages: 1242-1248, ISSN: 0004-637X
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- Citations: 10
Tong CH, Thompson MJ, Warner MR, et al., 2003, Acoustic wave propagation in the Sun: Implications for wave field and time-distance helioseismology, ASTROPHYSICAL JOURNAL, Vol: 582, Pages: L121-L124, ISSN: 0004-637X
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- Citations: 11
Lee H, Morgan JV, Warner MR, 2003, Radargrammetry of opposite-side stereo magellan synthetic aperture radar on Venus, 23rd International Geoscience and Remote Sensing Symposium (IGARSS 2003), Publisher: IEEE, Pages: 182-184
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- Citations: 1
Croskell M, Warner M, Morgan J, 2002, Annealing of shocked quartz during atmospheric re-entry, GEOPHYSICAL RESEARCH LETTERS, Vol: 29, ISSN: 0094-8276
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- Citations: 12
Tay PL, Lonergan L, Warner M, et al., 2002, Seismic investigation of thick evaporite deposits on the central and inner unit of the Mediterranean Ridge accretionary complex, MARINE GEOLOGY, Vol: 186, Pages: 167-194, ISSN: 0025-3227
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- Citations: 20
Jones KA, Warner M, Le Meur D, et al., 2002, Wide-angle images of the Mediterranean Ridge backstop structure, MARINE GEOLOGY, Vol: 186, Pages: 145-166, ISSN: 0025-3227
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- Citations: 11
Collins GS, Melosh HJ, Morgan JV, et al., 2002, Hydrocode Simulations of Chicxulub crater collapse and peak-ring formation, ICARUS, Vol: 157, Pages: 24-33, ISSN: 0019-1035
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- Citations: 162
Morgan J, Warner M, Grieve R, 2002, Geophysical constraints on the size and structure of the Chicxulub impact crater, Boulder, International interdisciplinary conference on catastrophic events and mass extinctions - impacts and beyond, University of Vienna, Vienna, Austria, Publisher: Geological Soc America Inc, Pages: 39-46
Morgan J, Warner M, Grieve R, 2002, Geophysical constraints on the size and structure of the Chicxulub impact crater, Boulder, International interdisciplinary conference on catastrophic events and mass extinctions - impacts and beyond, University of Vienna, Vienna, Austria, Publisher: Geological Soc America Inc, Pages: 39-46
Christeson GL, Nakamura Y, Buffler RT, et al., 2001, Deep crustal structure of the Chicxulub impact crater, JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH, Vol: 106, Pages: 21751-21769, ISSN: 2169-9313
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- Citations: 48
Mackenzie GD, Maguire PKH, Denton P, et al., 2001, Shallow seismic velocity structure of the Chicxulub impact crater from modelling of Rg dispersion using a genetic algorithm, TECTONOPHYSICS, Vol: 338, Pages: 97-112, ISSN: 0040-1951
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- Citations: 11
Christeson GL, Nakamura Y, Buffler RT, et al., 2000, Deep structure of Chicxulub impact crater from wide-angle seismic data., METEORITICS & PLANETARY SCIENCE, Vol: 35, Pages: A41-A41, ISSN: 0026-1114
Morgan RPL, Barton PJ, Warner M, et al., 2000, Lithospheric structure north of Scotland -: I.: <i>P</i>-wave modelling, deep reflection profiles and gravity, GEOPHYSICAL JOURNAL INTERNATIONAL, Vol: 142, Pages: 716-736, ISSN: 0956-540X
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- Citations: 20
Alberts P, Warner M, Lister D, 2000, Artificial neural networks for simultaneous multi horizon tracking across discontinuities
A new algorithm based on artificial neural networks has been implemented to assist an interpreter in the task of horizon tracking. Several horizons can be classified and tracked simultaneously. The classification process relies on a set of seismic attributes characterizing the targets. The tracker jumps over faults and other discontinuities and once trained does not require any seed points.
Alberts P, Warner M, Lister D, 2000, Artificial neural networks for simultaneous multi horizon tracking across discontinuities, SEG Technical Program Expanded Abstracts, Vol: 19, Pages: 651-653, ISSN: 1052-3812
A new algorithm based on artificial neural networks has been implemented to assist an interpreter in the task of horizon tracking. Several horizons can be classified and tracked simultaneously. The classification process relies on a set of seismic attributes characterizing the targets. The tracker jumps over faults and other discontinuities and once trained does not require any seed points.
Morgan P, Barton P, Warner MR, et al., 2000, Lithospheric structure north of Scotland - I, Geophysical Journal International, Vol: 142, Pages: 716-736
Morgan JV, Warner MR, Collins G, et al., 2000, Peak-ring formation in large impact craters: geophysical constraints from Chicxulub, Earth and Planetary Science Letters, Vol: 183, Pages: 347-354, ISSN: 0012-821X
Jones K, Warner M, Brittan J, 1999, Anisotropy in multi-offset deep-crustal seismic experiments, GEOPHYSICAL JOURNAL INTERNATIONAL, Vol: 138, Pages: 300-318, ISSN: 0956-540X
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- Citations: 13
Snyder DB, Hobbs RW, Britan J, et al., 1999, Ringed structural zones with deep roots formed by the Chicxulub impact, Journal of Geophysical Research: Solid Earth, Vol: 104, Pages: 10743-10755, ISSN: 2169-9313
The Chicxulub meteorite/comet impact of 65 Ma occurred on the present northeast coast of the Yucatan peninsula of Mexico and is considered by many to have caused a mass extinction at the end of the Cretaceous period. Impact craters are traditionally described in terms of ring structures. Deeply rooted faults underlying four previously recognized ring zones of the Chicxulub impact crater, as revealed on new deep seismic reflection profiles, demonstrate the catastrophic and diverse deformations that produced these zones. The innermost annular zone at Chicxulub coincides with a central peak ring. The seismic data show that the peak ring is composed of low-velocity (<5 km s-1), chaotically reflective material, interpreted as impact breccia, lying on top of blocks of pre-impact strata that were downdropped 4-6 km. Normal faults within the Cretaceous strata and deep, inward dipping reflections characterize two deformation zones at radial distances of 55-65 and 85-98 km. These normal faults accommodated the collapse, during the modification stage of crater development, of large (radial width of 5-25 km) blocks of pre-impact strata uplifted during the excavation stage. The structures root in the lower crust at depths of 15-30 km. Blind thrusts indicated by monoclines in pre-impact sedimentary rocks and deep, inward dipping reflections within the crystalline basement mark the outermost ring of deformation. These monoclines correlate with small topographic changes on the Cretaceous-Tertiary boundary layer at radial distances of 120-135 km. Palinspastic restoration of coherent blocks of downdropped pre-impact strata enabled improved estimates of the size and shape of the hole formed by the impact in a prominent reflector at 3- to 4-km depth. This hole is slightly elliptical along a SE-NW major axis (radius of 68 versus 63 km). Copyright 1999 by the American Geophysical Union.
Morgan J, Warner M, 1999, Chicxulub: The third dimension of a multi-ring impact basin, GEOLOGY, Vol: 27, Pages: 407-410, ISSN: 0016-8505
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- Citations: 83
Davies P, Warner M, 1999, Non-linear cross-equalisaton of seismic surveys acquired with different bandwidths
Brittan J, Morgan JV, Warner MR, et al., 1999, Near-surface seismic expression of the Chicxulub impact crater, Large meteorite impacts and planetary evolution II, Pages: 269-279
Morgan JV, Warner M, 1999, Morphology of the Chicxulub impact: Peak-ring crater or multi-ring basin?, Large Meteorite Impacts and Planetary Evolution Ii, Pages: 281-290
Morgan JV, Warner MR, 1999, The Chicxulub seismic experiment: Crater morphology, Large meteorite impacts and planetary evolution II, Pages: 269-279
Maguire PKH, Mackenzie GD, Denton P, et al., 1998, Preliminary results from a passive seismic array over the Chicxulub impact structure in Mexico, Geological Society Special Publication, Vol: 140, Pages: 177-193, ISSN: 0305-8719
This paper is part of the special publication Meteorites: flux with time and impact effects (eds M.M. Grady, R. Hutchinson, G.J.H. McCall and D.A. Rothery). A passive, 20-element, short-period (1 Hz) and broadband seismic array was deployed over the Chicxulub impact structure for c.100 days in early 1996. The principal objective was to study the shear-wave anisotropy associated with the structure; in particular, to determine the presence (or absence) of radial symmetry which will allow comment on the time variance of that anisotropy. A total of 15 teleseismic, 75 regional, and 100 local events were recorded. Preliminary results from studies of the surface-wave dispersion of the local events, and a receiver function analysis of a single teleseismic event are reported here. Thirty local events have been located, a number of which originated from quarries within the array. Analysis of seismograms from three of these events demonstrates a bimodal distribution; those whose ray-paths cross the outer part of the impact structure show a strong inverse dispersion, whereas those with ray-paths crossing the centre do not. The pattern may be produced by the sedimentary depositional environment, with deeper water sedimentation in the outer part of the post- impact crater basin and shallower water sedimentation over the upraised peak-ring block at the centre. Receiver functions derived for an event originating in Peru are dominated by an efficient mode conversion, simply modelled as a P-S multiple from the base Tertiary boundary. This shows a strong correlation with distance from the centre of the impact structure and implies it has an S-wave radial symmetry. The multiple also has a variable delay probably related to the depth of the conversion boundary. Unfortunately, the Moho conversion occurs at almost exactly the same time as this surface layer sediment multiple, restricting any modelling of Moho topography and its influence on the receiver functions.
Simpson F, Warner M, 1998, Coincident magnetotelluric, P-wave and S-wave images of the deep continental crust beneath the Weardale granite, NE England: seismic layering, low conductance and implications against the fluids paradigm, GEOPHYSICAL JOURNAL INTERNATIONAL, Vol: 133, Pages: 419-434, ISSN: 0956-540X
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- Citations: 18
Simpson F, Warner MR, 1998, Coincident magnetotelluric, P-wave and S-wave images of the deep continental crust, Geophysical Journal International, Vol: 133, Pages: 419-434
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