Publications
64 results found
Collier J, 2010, Splitting continents, Planet Earth, Pages: 26-27, ISSN: 1479-2605
Jenny Collier describes how her team is doing research work to know why providing some pairs of continents trigger lots of volcanoes when they break apart, while others do not. The consensus among scientists before her team's work was that these very different styles of break-up are controlled by the temperature of the mantle beneath the separating continents. They arranged for geophysical instruments from four different organizations to be delivered in three 30ft containers. Planning for the cruise in 2002 and 2003 was tense, with the build-up to the Iraq war resulting in several changes to their port and start date. One highlight for the novice sailors on board was an ancient maritime initiation to mark their first crossing the line with a colorful ceremony in which the ship's crew played the traditional roles of Neptune and his court.
Armitage JJ, Collier JS, Minshull TA, 2010, The importance of rift history for volcanic margin formation, NATURE, Vol: 465, Pages: 913-917, ISSN: 0028-0836
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- Citations: 70
Collier JS, Minshull TA, Hammond JOS, et al., 2009, Factors influencing magmatism during continental breakup: New insights from a wide-angle seismic experiment across the conjugate Seychelles-Indian margins, JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH, Vol: 114, ISSN: 2169-9313
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- Citations: 51
Collier JS, Sansom V, Ishizuka O, et al., 2008, Age of Seychelles-India break-up, EARTH AND PLANETARY SCIENCE LETTERS, Vol: 272, Pages: 264-277, ISSN: 0012-821X
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- Citations: 160
Minshull TA, Lane CI, Collier JS, et al., 2008, The relationship between rifting and magmatism in the northeastern Arabian Sea, NATURE GEOSCIENCE, Vol: 1, Pages: 463-467, ISSN: 1752-0894
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- Citations: 74
Brown CJ, Collier JS, 2008, Mapping benthic habitat in regions of gradational substrata: An automated approach utilising geophysical, geological, and biological relationships, ESTUARINE COASTAL AND SHELF SCIENCE, Vol: 78, Pages: 203-214, ISSN: 0272-7714
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- Citations: 86
Gupta S, Collier JS, Palmer-Felgate A, et al., 2007, Catastrophic flooding origin of shelf valley systems in the English Channel, NATURE, Vol: 448, Pages: 342-U5, ISSN: 0028-0836
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- Citations: 188
Collier JS, Humber S R, 2007, Time-lapse side-scan sonar imaging of bleached coral reefs: a case study from the Seychelles, Remote Sensing of Environment, Vol: 108, Pages: 339-356, ISSN: 0034-4257
Collier JS, Gupta S, Potter G, et al., 2006, Using bathymetry to identify basin inversion structures on the English Channel shelf, GEOLOGY, Vol: 34, Pages: 1001-1004, ISSN: 0091-7613
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- Citations: 14
Lonergan L, Maidment S, Collier J, 2006, Pleistocene subglacial tunnel valleys in the central North Sea basin: 3-D morphology and evolution, Journal of Quaternary Science, Vol: 21, Pages: 891-903, ISSN: 0267-8179
Collier JS, Brown CJ, 2005, Correlation of sidescan backscatter with grain size distribution of surficial seabed sediments, MARINE GEOLOGY, Vol: 214, Pages: 431-449, ISSN: 0025-3227
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- Citations: 160
Collier JS, Minshull TA, Kendall JM, et al., 2004, Rapid continental breakup and microcontinent formation in the western Indian Ocean, EOS, Vol: 85
Collier JS, Watts AB, 2001, Lithospheric response to volcanic loading by the Canary Islands: constraints from seismic reflection data in their flexural moat, GEOPHYSICAL JOURNAL INTERNATIONAL, Vol: 147, Pages: 660-676, ISSN: 0956-540X
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- Citations: 47
Collier JS, 2001, Sidescan sonar imaging of bleached coral reefs in the Seychelles, Shoals of Capricorn Marine Science, Training and Education in the Western Indian Ocean, Field Report 1998-2001, Publisher: Royal Geographical Society (with the Institute of British Geographers), ISBN: 0-907649-90-4
Hayward N, Watts AB, Westbrook GK, et al., 1999, A seismic reflection and GLORIA study of compressional deformation in the Gorringe Bank region, eastern North Atlantic, GEOPHYSICAL JOURNAL INTERNATIONAL, Vol: 138, Pages: 831-850, ISSN: 0956-540X
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- Citations: 73
Collier JS, Singh SC, 1998, Poisson's ratio structure of young oceanic crust, Journal of Geophysical Research: Solid Earth, Vol: 103, Pages: 20981-20996, ISSN: 2169-9313
We have applied full waveform inversion to wide-aperture seismic reflection data from the southern East Pacific Rise near 14° S. The data contain clear compressional wave and doubly converted shear wave arrivals that provide good constraints on the P and S -wave velocities (Vp, Vs, and hence Poisson's ratio σ) and seismic attenuation (Qp, Qs) structure of seismic layer 2. Layer 2A is highly attenuating (Qp=18-30 and Qs=8-15) and layer 2B is moderately attenuating (Qp=30-50 and Qs=20-25). Our results show high σ at the seafloor and in layer 2A (σ=0.48). Across the top of the 2A/B transition the rapid increase in Vp is accompanied by a sharp drop in σ to 0.25 within just 200 m of the seafloor. We perform simple calculations to gain an insight into the porosity and crack distribution with depth. These calculations suggest that porosity is in excess of 30% in layer 2A but reduces to 6-7% at the top of the 2A/B transition and to about 5% at a depth of 600 m below seafloor within layer 2B. Our results suggest that there is an increase in the average aspect ratio with depth across the 2A/B transition. The most likely explanation is that numerous thin cracks either mechanically close or are infilled at depth. Our results show there to be an abrupt change in the pore structure across the 2A/B transition which is consistent with a lithologic transition from extrusives to dykes but is equally consistent with a transition (mechanical or hydrothermal) within the extrusive pile.
Singh SC, Kent GM, Collier JS, et al., 1998, Melt to mush variations in crustal magma properties along the ridge crest at the southern East Pacific Rise, NATURE, Vol: 394, Pages: 874-878, ISSN: 0028-0836
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- Citations: 132
Collier JS, 1998, A seismic inversion study of the axial magma chamber reflector beneath the East Pacific Rise near 10 N, Modern Ocean Floor Processes and the Geological Record, Publisher: Geological Society of London, ISBN: 9781862390232
Singh SC, Kent GM, Collier JS, et al., 1998, Melt to mush variations in crustal magma properties along the ridge crest at the southern East Pacific Rise, Nature, Vol: 394, Pages: 874-878
Collier JS, Singh SC, 1998, A seismic inversion study of the axial magma chamber reflector beneath the East Pacific Rise near 10 degrees N, Modern Ocean Floor Processes and the Geological Record, Vol: 148, Pages: 17-28
Collier JS, Henstock TJ, Peirce C, et al., 1998, A detailed geophysical study in the Canary Basin (eastern Atlantic) : implications for the internal structure of 130 Ma oceanic crust, Geophysical Journal International, Vol: 135, Pages: 943-963
Collier JS, Singh SC, 1998, Poissons ratio structure of young oceanic crust, Journal of Geophysical Research, Vol: 103, Pages: 20981-20996
Collier JS, Watts AB, 1997, Seismic-reflection constraints on lithospheric extension: Pure versus simple shear, GEOPHYSICAL JOURNAL INTERNATIONAL, Vol: 129, Pages: 737-748, ISSN: 0956-540X
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- Citations: 3
Watts AB, Peirce C, Collier J, et al., 1997, A seismic study of lithospheric flexure in the vicinity of Tenerife, Canary Islands, Earth and Planetary Science Letters, Vol: 146, Pages: 431-447, ISSN: 0012-821X
Collier JS, Singh SC, 1997, Detailed structure of the top of the melt body beneath the East Pacific Rise at 9 degrees 40'N from waveform inversion of seismic reflection data, Journal of Geophysical Research-Solid Earth, Vol: 102, Pages: 20287-20304
Collier JS, Danobeitia JJ, Canales JP, et al., 1997, Evidence for asymmetric accretion and low-angle, planar faults in slow-spreading oceanic crust, Geology, Vol: 25, Pages: 1075-1078
Collier JS, Buhl P, Torne M, et al., 1994, Moho and Lower Crustal Reflectivity beneath a Young Rift Basin - Results from a 2-Ship, Wide-Aperture Seismic-Reflection Experiment in the Valencia Trough (Western Mediterranean), Geophysical Journal International, Vol: 118, Pages: 159-180
Wiedicke M, Collier J, 1993, Morphology of the Valu Fa Spreading Ridge in the Southern Lau Basin, Journal of Geophysical Research-Solid Earth, Vol: 98, Pages: 11769-11782
Collier JS, Sinha MC, 1992, Seismic mapping of a magma chamber beneath the Valu Fa Ridge, Lau Basin, Journal of Geophysical Research: Solid Earth, Vol: 97, Pages: 14031-14053, ISSN: 0148-0227
<jats:p>We analyze a dense grid of seismic normal incidence and wide‐angle data collected over an active back arc spreading center in the Lau Basin of the southwest Pacific. Our survey area covers the whole of a 35‐km‐long morphological segment and a small overlapping spreading center. A bright reflector, which is coincident with a velocity inversion at a depth of 3.2 ± 0.2 km below the seafloor, is observed on every one of the 40 across‐axis profiles. We interpret this reflector as being the roof of a crustal magma chamber. The widest magma chamber reflector occurs beneath the overlapping spreading center, where it extends up to 4 km, being imaged beneath both ridges and, in places, beneath the overlap basin. Elsewhere the width of the reflector varies between 0.6 and 2.3 ±0.4 km. The narrowest reflectors are observed beneath deviations (devais) of the ridge axis. In addition to being observed on each of the kilometer‐spaced across‐axis profiles the reflector is also seen as a continuous event for at least 10 km on a profile along the ridge axis. The reflection coefficient of the event is between −0.34 and −0.65. This requires the melt at the top of the chamber to have a <jats:italic>P</jats:italic> wave velocity less than 2.7 km/s if the interface is planar or less than 3.8 km/s if the interface is layered.</jats:p>
MINSHULL TA, WHITE RS, BARTON PJ, et al., 1992, DEFORMATION AT PLATE BOUNDARIES AROUND THE GULF-OF-OMAN, MARINE GEOLOGY, Vol: 104, Pages: 265-277, ISSN: 0025-3227
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- Citations: 45
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