Publications
137 results found
Bell RE, Henrys S, Sutherland R, et al., 2014, Characterising the seismic behavior of subduction zones using active source seismic methods, SeisMix
Bell RE, Jackson CA-L, 2014, Are current models for normal fault array evoltion applicable to natural rifts?, Geometry and Growth of Normal Faults
Bell RE, Morgan J, Warner M, et al., 2014, Next-generation seismic experiments:wide-angle, multi-azimuth, three dimensional, full-waveform inversion, SEG/AGU Workshop on Advances in Active and Passive “Full Wavefield” Seismic Imaging: From Reservoirs to Plate Tectonics
Jackson CA-L, Rodriguez CR, Rotevatn A, et al., 2014, Geological and geophysical expression of a primary salt weld; an example from the Santos Basin, Brazil. In press, Interpretation
Morgan JV, Warner MR, Bell R, et al., 2013, Next-generation seismic experiments: wide-angle, multi-azimuth,three-dimensional, full-waveform inversion, Geophysical Journal International, Vol: in press
Full-waveform inversion (FWI) is an advanced seismic imaging technique that has recentlybecome computationally feasible in three dimensions, and that is being widely adopted andapplied by the oil and gas industry. Here we explore the potential for 3-D FWI, when combinedwith appropriate marine seismic acquisition, to recover high-resolution high-fidelity P-wavevelocity models for subsedimentary targets within the crystalline crust and uppermost mantle.We demonstrate that FWI is able to recover detailed 3-D structural information within aradially faulted dome using a field data set acquired with a standard 3-D petroleum-industrymarine acquisition system. Acquiring low-frequency seismic data is important for successfulFWI; we show that current acquisition techniques can routinely acquire field data from airgunsat frequencies as low as 2 Hz, and that 1 Hz acquisition is likely to be achievable using oceanbottomhydrophones in deep water. Using existing geological and geophysical models, weconstruct P-wave velocity models over three potential subsedimentary targets: the Soufri`ereHills Volcano on Montserrat and its associated crustal magmatic system, the crust and uppermostmantle across the continent–ocean transition beneath the Campos Basin offshore Brazil,and the oceanic crust and uppermost mantle beneath the East Pacific Rise mid-ocean ridge.Weuse these models to generate realistic multi-azimuth 3-D synthetic seismic data, and attempt toinvert these data to recover the original models.We explore resolution and accuracy, sensitivityto noise and acquisition geometry, ability to invert elastic data using acoustic inversion codes,and the trade-off between low frequencies and starting velocity model accuracy.We show thatFWI applied to multi-azimuth, refracted, wide-angle, low-frequency data can resolve featuresin the deep crust and uppermost mantle on scales that are significantly better than can beachieved by any other geophysical technique, and that these results ca
Reeve M, Bell RE, Jackson CA-L, 2013, Origin and significance of intra-basement seismic reflections offshore western Norway, Journal of the Geological Society, Vol: 171, Pages: 1-4
We use 3D seismic data to image a series of enigmatic, SW-dipping reflection packets within pre-Mesozoic crystalline basement offshore western Norway. Based on their low-angle dip and complex reflection wave-train our preferred interpretation is that the reflection packets are the seismic expression of mylonitic zones generated by nappe emplacement during the Caledonian Orogeny. Late Jurassic faults truncate and offset these reflection packets by several hundred metres, suggesting that these faults did not exploit pre-existing basement weaknesses. Our observations suggest that older basement fabrics may not always play a significant role in determining the geometry of later fault systems.
Jackson CAL, Chua S-T, Bell RE, et al., 2013, Structural style and growth of early-stage inversion structures: insights from 3D seismic reflection data, Egersund Basin, offshore Norway, Journal of Structural Geology, Vol: 46, Pages: 167-185
High-quality three-dimensional (3D) seismic reflection and borehole data from the Egersund Basin, offshore Norway are used to characterise the structural style and determine the timing of growth of inversion-related anticlines adjacent to a segmented normal fault system. Two thick-skinned normal faults, which offset Permian clastics and evaporites, delineate the north-eastern margin of the basin. These faults strike NNW-SSE, have up to 1900 m of displacement and are separated by an ESE-dipping, c. 10 km wide relay ramp. Both of these faults display exclusively normal separation at all structural levels and tip out upwards into the upper part of the Lower Cretaceous succession. At relatively shallow structural levels in the hangingwalls of these faults, a series of open, low-amplitude, fault-parallel anticlines are developed. These anticlines, which are asymmetric and verge towards the footwalls of the adjacent faults, are interpreted to have formed in response to mild inversion of the Egersund Basin. The amplitude of and apparent shortening associated with the anticlines vary along strike, and these variations mimic the along-strike variations in throw observed on the adjacent fault segments. We suggest that this relationship can be explained by along-strike changes in the propensity of the normal faults to reactivate during shortening; wider damage zones and lower angles of internal friction, coupled with higher pore fluids pressures at the fault centre, mean that reactivation is easier at this location than at the fault tips or in the undeformed country rock. Seismic-stratigraphic analysis of growth strata indicate that the folds initiated in the latest Turonian-to-earliest Coniacian (c. 88.6 Ma) and Santonian (c. 82.6 Ma); the control on this c. 6 Myr diachroneity in the initiation of fold growth is not clear, but it may be related to strain partitioning during the early stages of shortening. Anticline growth ceased in the Maastrichtian and the inversion event is
Jackson CA-L, Chua ST, Bell RE, et al., 2013, Structural style and early stage growth of inversion structures: 3D seismic insights from the Egersund Basin, offshore Norway, Journal of Structural Geology, Vol: 46, Pages: 167-185
Bell RE, Jackson CA-L, Whipp PS, et al., 2013, Quantifying the timing and magnitude of fault reactivation in the northern North Sea, Tectonic Studies Group Annual Meeting
Nixon CW, McNeill LC, Henstock T, et al., 2013, Basin evolution, organization of faulting and the distribution of displacement within the Gulf of Corinth rift, AGU Fall Meeting
Wilson DJ, McNeill LC, Henstock T, et al., 2013, Along-strike and down-dip variations in décollement physical properties relative to input parameters, AGU Fall Meeting
Bell RE, Morgan JV, Warner M, 2013, Recovering physical property information from subduction plate boundaries using 3D full-waveform seismic inversion, AGU Fall Meeting
Bell RE, Jackson CA-L, Elliott G, et al., 2013, Reconstructing rift geometry to gain insights into major unconformity development associated with Late Jurassic rifting in the Halten Terrace, offshore Norway, 30th IAS Meeting of Sedimentology
Bell RE, McNeill LC, Nixon C, et al., 2013, Basin evolution and the distribution of strain within the Gulf of Corinthrift, EGU General Assembly
Reeve MT, Bell RE, Jackson CA-L, 2013, The influence of Caledonian structures on Late Jurassic faulting offshore western Norway: new insights from 3D seismic reflection data, STUDENT ORAL PRESENTATION PRIZE WINNER, Tectonic Studies Group Annual Meeting
Barnes PM, Henrys SA, Mountjoy J, et al., 2012, Rough-crust subduction, upper plate structure, and variable fault behavior at the northern Hikurangi Margin, New Zealand, American Geophysical Union, Fall Meeting
Bell RE, Jackson CA-L, Whipp PS, et al., 2012, Fault evolution during polyphase extension: Horda Platform, North Sea, American Association of Petroleum Geologists Annual Conference and Exhibition
Bell RE, Jackson CA-L, Elliott GM, et al., 2012, Insights into lithospheric extension mechanisms and Late Jurassic reservoir distribution from restoring palaeobathymetry in the Halten Terrace, Deep-Water Continental Margins: The Final Exploration Frontier?, Geological Society conference
Bell RE, Jackson CA-L, Whipp PS, et al., 2012, Fault interaction between Permo-Triassic and Mid-Late Jurassic rift episodes in the northern North Sea, Onshore-Offshore relationships on the North Atlantic Margin
Bell RE, Jackson CA-L, Whipp PS, et al., 2012, Fault evolution during polyphase extension: Horda Platform, North Sea, Tectonic Studies Group Annual Meeting
Wallace LM, Silver EA, Bangs N, et al., 2012, Workshop on Using Ocean Drilling to Unlock the Secrets of Slow Slip Events (Workshop Report), Scientific Drilling, Vol: 14, Pages: 64-67
Bell RE, Wallace LM, Silver EA, et al., 2012, Using Ocean Drilling to Unlock the Secrets of Slow Slip Events, IODP International Workshop report
Bell RE, McNeill LC, Henstock TJ, et al., 2011, Comparing extension on multiple time and depth scales in the Corinth Rift, Central Greece, GEOPHYSICAL JOURNAL INTERNATIONAL, Vol: 186, Pages: 463-470, ISSN: 0956-540X
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- Citations: 34
Bell RE, Sutherland R, Henrys SA, et al., 2011, Seismic reflection character of the Hikurangi subduction megathrust, North Island, New Zealand INVITED, American Geophysical Union, Fall Meeting
Bell RE, McNeill LM, Henstock T, et al., 2011, Comparing extension on multiple time and depth scales in the Corinth Rift, Central Greece, Geophysical Journal International, Vol: 186, Pages: 463-470
Williams CA, Wallace LM, Beavan RJ, et al., 2011, Modeling of Slow Slip Events at the Hikurangi Subduction Margin, AGU Fall Meeting
Bell RE, McNeill L, Bull J, et al., 2011, Fault development and syn-rift basin structure within the Corinth Rift, Greece, American Association of Petroleum Geologists Annual Conference and Exhibition
Bell RE, Sutherland R, Henrys S, et al., 2011, Characterisation of the Hikurangi subduction margin, North Island, New Zealand, British Geophysical Association New Advances in Geophysics meeting
Barker DH, Wallace LM, Bell RE, et al., 2010, Drilling at the northern Hikurangi subduction margin, New Zealand: The key to unlock the secrets of slip slip events, American Geophysical Union Fall Meeting
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