Imperial College London

ProfessorJoannaMorgan

Faculty of EngineeringDepartment of Earth Science & Engineering

Professor of Geophysics
 
 
 
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Contact

 

+44 (0)20 7594 6423j.v.morgan

 
 
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Location

 

2.38BRoyal School of MinesSouth Kensington Campus

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Summary

 

Publications

Publication Type
Year
to

35 results found

Davy RG, Morgan JV, Minshull TA, Bayrakci G, Bull JM, Klaeschen D, Reston TJ, Sawyer DS, Lymer G, Cresswell Det al., Resolving the fine-scale velocity structure of continental hyperextension at the Deep Galicia Margin using full-waveform inversion, Geophysical Journal International, ISSN: 0956-540X

JOURNAL ARTICLE

Morgan JV, Artemieva N, Expedition 364 Science Party, Quantifying the release of climate-active gases by large meteorite impacts with a case study of Chicxulub, Geophysical Research Letters, ISSN: 0094-8276

JOURNAL ARTICLE

Morgan JV, Warner MR, Arnoux G, Hooft E, Toomey D, VanderBeek B, Wilcock Wet al., Next-Generation Seismic Experiments Part II: Wide-Angle, Multi-Azimuth, 3-D, Full-Waveform Inversion of sparse field data, Geophysical Journal International, ISSN: 1365-246X

JOURNAL ARTICLE

Arnoux GM, Toomey DR, Hooft EEE, Wilcock WSD, Morgan J, Warner M, VanderBeek BPet al., 2017, Seismic evidence that black smoker heat flux is influenced by localized magma replenishment and associated increases in crustal permeability, Geophysical Research Letters, ISSN: 0094-8276

JOURNAL ARTICLE

Rae ASP, Collins GS, Grieve RAF, Osinski GR, Morgan JVet al., 2017, Complex crater formation: Insights from combining observations of shock pressure distribution with numerical models at the West Clearwater Lake impact structure, METEORITICS & PLANETARY SCIENCE, Vol: 52, Pages: 1330-1350, ISSN: 1086-9379

JOURNAL ARTICLE

Morgan JV, Gulick SPS, Bralower T, Chenot E, Christeson G, Claeys P, Cockell CS, Collins GS, Coolen MJL, Ferriere L, Gebhardt C, Goto K, Jones H, Kring DA, Le Ber E, Lofi J, Long X, Lowery C, Mellett C, Ocampo-Torres R, Osinski GR, Perez-Cruz L, Pickersgill A, Poelchau M, Rae A, Rasmussen C, Rebolledo-Vieyra M, Riller U, Sato H, Schmitt DR, Smit J, Tikoo S, Tomioka N, Urrutia-Fucugauchi J, Whalen M, Wittmann A, Yamaguchi KE, Zylberman Wet al., 2016, The formation of peak rings in large impact craters, SCIENCE, Vol: 354, Pages: 878-882, ISSN: 0036-8075

JOURNAL ARTICLE

Silverton A, Warner M, Morgan J, Umpleby Aet al., 2016, Offset-variable density improves acoustic full-waveform inversion: a shallow marine case study, GEOPHYSICAL PROSPECTING, Vol: 64, Pages: 1201-1214, ISSN: 0016-8025

JOURNAL ARTICLE

Belcher CM, Hadden RM, Rein G, Morgan JV, Artemieva N, Goldin Tet al., 2015, An experimental assessment of the ignition of forest fuels by the thermal pulse generated by the Cretaceous-Palaeogene impact at Chicxulub, JOURNAL OF THE GEOLOGICAL SOCIETY, Vol: 172, Pages: 175-185, ISSN: 0016-7649

JOURNAL ARTICLE

Bray VJ, Collins GS, Morgan JV, Melosh HJ, Schenk PMet al., 2014, Hydrocode simulation of Ganymede and Europa cratering trends - How thick is Europa's crust?, ICARUS, Vol: 231, Pages: 394-406, ISSN: 0019-1035

JOURNAL ARTICLE

Gulick SPS, Christeson GL, Barton PJ, Grieve RAF, Morgan JV, Urrutia-Fucugauchi Jet al., 2013, GEOPHYSICAL CHARACTERIZATION OF THE CHICXULUB IMPACT CRATER, REVIEWS OF GEOPHYSICS, Vol: 51, Pages: 31-52, ISSN: 8755-1209

JOURNAL ARTICLE

Morgan J, Artemieva N, Goldin T, 2013, Revisiting wildfires at the K-Pg boundary, Journal of Geophysical Research: Biogeosciences, Vol: 118, Pages: 1508-1520, ISSN: 2169-8953

JOURNAL ARTICLE

Morgan J, Rebolledo-Vieyra M, 2013, Geophysical studies of impact craters, Impact Cratering, Editors: Osinski, Pierazzo, Publisher: Wiley-Blackwell, Pages: 211-222, ISBN: 9781405198295

BOOK CHAPTER

Morgan J, Warner M, Bell R, Ashley J, Barnes D, Little R, Roele K, Jones Cet al., 2013, Next-generation seismic experiments: wide-angle, multi-azimuth, three-dimensional, full-waveform inversion, GEOPHYSICAL JOURNAL INTERNATIONAL, Vol: 195, Pages: 1657-1678, ISSN: 0956-540X

JOURNAL ARTICLE

Warner M, Ratcliffe A, Nangoo T, Morgan J, Umpleby A, Shah N, Vinje V, Stekl I, Guasch L, Win C, Conroy G, Bertrand Aet al., 2013, Anisotropic 3D full-waveform inversion, GEOPHYSICS, Vol: 78, Pages: R59-R80, ISSN: 0016-8033

JOURNAL ARTICLE

Christeson GL, Morgan JV, Warner MR, 2012, Shallow oceanic crust: Full waveform tomographic images of the seismic layer 2A/2B boundary, JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH, Vol: 117, ISSN: 2169-9313

JOURNAL ARTICLE

Vieira da Silva N, Morgan JV, MacGregor L, Warner Met al., 2012, A finite element multifrontal method for 3D CSEM modeling in the frequency domain, Geophysics, Vol: 77, Pages: E101-E115

There has been a recent increase in the use of controlled-source electromagnetic (CSEM) surveys in the exploration for oil and gas. We developed a modeling scheme for 3D CSEM modeling in the frequency domain. The electric field was decomposed in primary and secondary components to eliminate the singularity originated by the source term. The primary field was calculated using a closed form solution, and the secondary field was computed discretizing a second-order partial differential equation for the electric field with the edge finite element. The solution to the linear system of equations was obtained using a massive parallel multifrontal solver, because such solvers are robust for indefinite and ill-conditioned linear systems. Recent trends in parallel computing were investigated for their use in mitigating the computational overburden associated with the use of a direct solver, and of its feasibility for 3D CSEM forward modeling with the edge finite element. The computation of the primary field was parallelized, over the computational domain and the number of sources, using a hybrid model of parallelism. When using a direct solver, the attainment of multisource solutions was only competitive if the same factors are used to achieve a solution for multi right-hand sides. This aspect was also investigated using the presented methodology. We tested our proposed approach using 1D and 3D synthetic models, and they demonstrated that it is robust and suitable for 3D CSEM modeling using a distributed memory system. The codes could thus be used to help design new surveys, as well to estimate subsurface conductivities through the implementation of an appropriate inversion scheme.

JOURNAL ARTICLE

da Silva NV, Morgan JV, MacGregor L, Warner Met al., 2012, A finite element multifrontal method for 3D CSEM modeling in the frequency domain, GEOPHYSICS, Vol: 77, Pages: E101-E115, ISSN: 0016-8033

JOURNAL ARTICLE

Kamo SL, Lana C, Morgan JV, 2011, U-Pb ages of shocked zircon grains link distal K-Pg boundary sites in Spain and Italy with the Chicxulub impact, EARTH AND PLANETARY SCIENCE LETTERS, Vol: 310, Pages: 401-408, ISSN: 0012-821X

JOURNAL ARTICLE

Morgan JV, Warner MR, Collins GS, Grieve RAF, Christeson GL, Gulick SPS, Barton PJet al., 2011, Full waveform tomographic images of the peak ring at the Chicxulub impact crater, JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH, Vol: 116, ISSN: 2169-9313

JOURNAL ARTICLE

Barton PJ, Grieve RAF, Morgan JV, Surendra AT, Vermeesch PM, Christeson GL, Gulick SPS, Warner MRet al., 2010, Seismic images of Chicxulub impact melt sheet and comparison with the Sudbury structure, Pages: 103-113

Chicxulub is the only known impact structure on Earth with a fully preserved peak ring, and it forms an important natural laboratory for the study of large impact structures and u nderstanding of large-scale cratering on Earth and other planets. Seismic data collected in 1996 and 2005 reveal detailed images of the uppermost crater in the central basin at Chicxulub. Seismic reflection profiles show a reflective layer ∼1 km beneath the apparent crater floor, topped by upwardly concave reflectors interpreted as saucer-shaped sills. The upper part of this reflective layer is coincident with a thin high-velocity layer identified by analyzing refractions on the 6 km seismic streamer data. The high-velocity layer is almost horizontal and appears to be contained within the peak ring structure. We argue that this reflective layer is the predicted coherent melt sheet formed during impact, and it may be comparable with the unit known as the Sudbury Igneous Complex at the Sudbury impact structure. The Sudbury Igneous Complex, interpreted as a differentiated impact melt sheet, appears to have a similar scale and geometry, and an uppermost lithological sequence consisting of a high velocity layer at the top and a velocity inversion beneath. This comparison suggests that the Chicxulub impact structure also contains a coherent differentiated melt sheet. © 2010 The Geological Society of America. All rights reserved.

BOOK CHAPTER

Grieve RAF, Ames DE, Morgan JV, Artemieva Net al., 2010, The evolution of the Onaping Formation at the Sudbury impact structure, METEORITICS & PLANETARY SCIENCE, Vol: 45, Pages: 759-782, ISSN: 1086-9379

JOURNAL ARTICLE

Schulte P, Alegret L, Arenillas I, Arz JA, Barton PJ, Bown PR, Bralower TJ, Christeson GL, Claeys P, Cockell CS, Collins GS, Deutsch A, Goldin TJ, Goto K, Grajales-Nishimura JM, Grieve RAF, Gulick SPS, Johnson KR, Kiessling W, Koeberl C, Kring DA, MacLeod KG, Matsui T, Melosh J, Montanari A, Morgan JV, Neal CR, Nichols DJ, Norris RD, Pierazzo E, Ravizza G, Rebolledo-Vieyra M, Reimold WU, Robin E, Salge T, Speijer RP, Sweet AR, Urrutia-Fucugauchi J, Vajda V, Whalen MT, Willumsen PSet al., 2010, The Chicxulub Asteroid Impact and Mass Extinction at the Cretaceous-Paleogene Boundary, SCIENCE, Vol: 327, Pages: 1214-1218, ISSN: 0036-8075

JOURNAL ARTICLE

Schulte P, Alegret L, Arenillas I, Arz JA, Barton PJ, Bown PR, Bralower TJ, Christeson GL, Claeys P, Cockell CS, Collins GS, Deutsch A, Goldin TJ, Goto K, Grajales-Nishimura JM, Grieve RAF, Gulick SPS, Johnson KR, Kiessling W, Koeberl C, Kring DA, Macleod KG, Matsui T, Melosh J, Montanari A, Morgan JV, Neal CR, Norris RD, Pierazzo E, Ravizza G, Rebolledo-Vieyra M, Reimold WU, Robin E, Salge T, Speijer RP, Sweet AR, Urrutia-Fucugauchi J, Vajda V, Whalen MT, Willumsen PSet al., 2010, Response - Cretaceous Extinctions, SCIENCE, Vol: 328, Pages: 975-976, ISSN: 0036-8075

JOURNAL ARTICLE

Artemieva N, Morgan J, 2009, Modeling the formation of the K-Pg boundary layer, ICARUS, Vol: 201, Pages: 768-780, ISSN: 0019-1035

JOURNAL ARTICLE

Christeson GL, Collins GS, Morgan JV, Gulick SPS, Barton PJ, Warner MRet al., 2009, Mantle deformation beneath the Chicxulub impact crater, EARTH AND PLANETARY SCIENCE LETTERS, Vol: 284, Pages: 249-257, ISSN: 0012-821X

JOURNAL ARTICLE

Collins GS, Morgan J, Barton P, Christeson GL, Gulick S, Urrutia J, Warner M, Wuennemann Ket al., 2008, Dynamic modeling suggests terrace zone asymmetry in the Chicxulub crater is caused by target heterogeneity, EARTH AND PLANETARY SCIENCE LETTERS, Vol: 270, Pages: 221-230, ISSN: 0012-821X

JOURNAL ARTICLE

Grieve RAF, Reimold U, Morgan JV, Riller U, Pilkington Met al., 2008, Observations and interpretations at Vredefort, Sudbury and Chicxulub: Towards a composite model of a terrestrial impact basin, Meteoritics and Planetary Science, Vol: 43, Pages: 855-882

JOURNAL ARTICLE

Gulick SPS, Barton PJ, Christeson GL, Morgan JV, McDonald M, Mendoza-Cervantes K, Pearson ZF, Surendra A, Urrutia-Fucugauchi J, Vermeesch PM, Warner MRet al., 2008, Importance of pre-impact crustal structure for the asymmetry of the Chicxulub impact crater, NATURE GEOSCIENCE, Vol: 1, Pages: 131-135, ISSN: 1752-0894

JOURNAL ARTICLE

Morgan JV, 2008, Comment on determining chondritic impactor size from the marine osmium isotope record, SCIENCE, Vol: 321, ISSN: 0036-8075

JOURNAL ARTICLE

Morgan JV, Christeson G, Gulick S, Grieve R, Urrutia J, Barton P, Rebolledo M, Melosh Jet al., 2007, Joint IODP/ICDP scientific drilling of the Chicxulub impact crater, Scientific Drilling, Pages: 42-44, ISSN: 1816-8957

JOURNAL ARTICLE

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