Search Results - "Spence, D G"

Distributed natural gas venting offshore along the Cascadia margin by Riedel, M., Scherwath, M., Römer, M., Veloso, M., Heesemann, M., Spence, G. D.

“…Widespread gas venting along the Cascadia margin is investigated from acoustic water column data and reveals a nonuniform regional distribution of over 1100…”
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Decreased stability of methane hydrates in marine sediments owing to phase-boundary roughness by Hyndman, R. D, Wood, W. T, Gettrust, J. F, Chapman, N. R, Spence, G. D

“…Below water depths of about 300 metres, pressure and temperature conditions cause methane to form ice-like crystals of methane hydrate. Marine deposits of…”
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Focused Fluid Flow Along the Nootka Fault Zone and Continental Slope, Explorer‐Juan de Fuca Plate Boundary by M. Riedel, K. M. M. Rohr, G. D. Spence, D. Kelley, J. Delaney, L. Lapham, J. W. Pohlman, R. D. Hyndman, E. C. Willoughby

“…Abstract Geophysical and geochemical data indicate there is abundant fluid expulsion in the Nootka fault zone (NFZ) between the Juan de Fuca and Explorer…”
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Seismic investigations of a vent field associated with gas hydrates, offshore Vancouver Island by Riedel, M., Spence, G. D., Chapman, N. R., Hyndman, R. D.

“…A three‐dimensional seismic reflection survey was carried out over a gas hydrate field offshore Vancouver Island in the area of Ocean Drilling Program Leg 146,…”
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Forearc structure beneath southwestern British Columbia: A three-dimensional tomographic velocity model by Ramachandran, K., Dosso, S. E., Spence, G. D., Hyndman, R. D., Brocher, T. M.

“…This paper presents a three‐dimensional compressional wave velocity model of the forearc crust and upper mantle and the subducting Juan de Fuca plate beneath…”
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Characterizing the thermal regime of cold vents at the northern Cascadia margin from bottom-simulating reflector distributions, heat-probe measurements and borehole temperature data by Riedel, M., Tréhu, A. M., Spence, G. D.

“…Several cold vents are observed at the northern Cascadia margin offshore Vancouver Island in a 10 km 2 region around Integrated Ocean Drilling Program…”
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Reflection signature of seismic and aseismic slip on the northern Cascadia subduction interface by Nedimovi, Mladen R, Hyndman, Roy D, Ramachandran, Kumar, Spence, George D

“…At the northern Cascadia margin, the Juan de Fuca plate is underthrusting North America at about 45 mm yr-1 (ref. 1), resulting in the potential for…”
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Seismic velocity studies of a gas hydrate bottom-simulating reflector on the northern Cascadia continental margin: Amplitude modeling and full waveform inversion by Yuan, T., Spence, G. D., Hyndman, R. D., Minshull, T. A., Singh, S. C.

“…On the northern Cascadia subduction margin, the multichannel seismic amplitude‐versus‐offset (AVO) behavior of a bottom‐simulating reflector (BSR) suggests a P…”
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Reduced magnetization produced by increased methane flux at a gas hydrate vent by Novosel, I., Spence, G.D., Hyndman, R.D.

“…Magnetic susceptibility measurements on near-surface sediment cores from the North Cascadia accretionary sedimentary prism show that seismic blanking or…”
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Hydrate distribution off Vancouver Island from multifrequency single-channel seismic reflection data by Fink, C. R., Spence, G. D.

“…On the northern Cascadia margin, single channel seismic data clearly image the bottom‐simulating reflector (BSR) that marks the base of the hydrate stability…”
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Upper crustal structure of southwestern British Columbia from the 1998 Seismic Hazards Investigation in Puget Sound by Ramachandran, K., Dosso, S. E., Zelt, C. A., Spence, G. D., Hyndman, R. D., Brocher, T. M.

“…This paper applies nonlinear three‐dimensional travel time tomography to refraction data recorded during the 1998 Seismic Hazards Investigation in Puget Sound…”
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Seismic velocity structure of the Queen Charlotte terrace off western Canada in the region of the 2012 Haida Gwaii Mw 7.8 thrust earthquake by Riedel, Michael, Yelisetti, S, Papenberg, C, Rohr, K. M. M, Côté, M. M, Spence, G. D, Hyndman, R. D, James, T

“…A well-recorded Mw 7.8 megathrust earthquake occurred on 27 October 2012 under the Queen Charlotte terrace off the west coast of Haida Gwaii, western Canada…”
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Heat flow variations from bottom simulating reflectors on the Cascadia margin by Ganguly, N, Spence, G.D, Chapman, N.R, Hyndman, R.D

“…A bottom simulating reflector (BSR), representing the base of the gas hydrate stability field, was observed over a closely spaced grid of seismic lines on the…”
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Barkley Canyon Gas Hydrates: A Synthesis Based on Two Decades of Seafloor Observation and Remote Sensing by Riedel, M., Scherwath, M., Römer, M., Paull, C. K., Lundsten, E. M., Caress, D., Brewer, P. G., Pohlman, J. W., Lapham, L. L., Chapman, N. R., Whiticar, M. J., Spence, G. D., Enkin, R. J., Douglas, K.

“…Barkley Canyon is one of the few known sites worldwide with the occurrence of thermogenic gas seepage and formation of structure-II and structure-H gas hydrate…”
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Magmatism at rifted continental margins by White, Robert S, Spence, George D, Fowler, Susan R, McKenzie, Dan P, Westbrook, Graham K, Bowen, Adrian N

“…The intense volcanism and uplift observed on many rifted continental margins is accompanied by the emplacement of a thick igneous section at depth. A…”
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Double-blind randomized study of the effect of infusion rates on toxicity of amphotericin B by ELLIS, M. E, AL-HOKAIL, A. A, CLINK, H. M, PADMOS, M. A, ERNST, P, SPENCE, D. G, THARPE, W. N, HILLIER, V. F

“…Classifications Services AAC Citing Articles Google Scholar PubMed Related Content Social Bookmarking CiteULike Delicious Digg Facebook Google+ Mendeley Reddit…”
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Upper crustal velocity structure of the southwestern Canadian Cordillera from explosion recordings on the WCTN earthquake seismic net by FALLOWS, S. J, SPENCE, G. D, ROGERS, G. C

“…--The digital seismic network used to monitor earthquakes in southwestern British Columbia recorded explosions from Lithoprobe's Southern Cordillera Refraction…”
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Administration of nitrous oxide to pediatric patients provides analgesia for venous cannulation by HENDERSON, J. M, SPENCE, D. G, KOMOCAR, L. M, BONN, G. E, STENSTROM, R. J

“…To determine whether administration of nitrous oxide, 50% and 70%, could provide analgesia and anxiolysis during venous cannulation in pediatric patients, 165…”
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Fluid flow and origin of a carbonate mound offshore Vancouver Island: Seismic and heat flow constraints by He, T., Spence, G.D., Riedel, M., Hyndman, R.D., Chapman, N.R.

“…A 1.5 km long, 1 km wide and 70–80 m high carbonate mound was identified on the mid-slope region of the subduction accretionary sedimentary prism offshore…”
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Mantle involvement in lithospheric collision: Seismic evidence from the Trans-Hudson Orogen, western Canada by Hajnal, Z., Nemeth, B., Clowes, R. M., Ellis, R. M., Spence, G. D., Burianyk, M. J. A., Asudeh, I., White, D. J., Forsyth, D. A.

“…Three seismic refraction/wide‐angle reflection profiles were recorded over the Trans‐Hudson Orogen. The profiles display high quality coherent seismic signals…”
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