Zobrazeno 1 - 10
of 19
pro vyhledávání: '"G. D. Spence"'
Autor:
M. Riedel, M. Scherwath, M. Römer, C. K. Paull, E. M. Lundsten, D. Caress, P. G. Brewer, J. W. Pohlman, L. L. Lapham, N. R. Chapman, M. J. Whiticar, G. D. Spence, R. J. Enkin, K. Douglas
Publikováno v:
Frontiers in Earth Science, Vol 10 (2022)
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 mounds on the seafloor. This site is the location of continuous seafloor monitoring as par
Externí odkaz:
https://doaj.org/article/219d4027962a4d00814bd6f4e93a6155
Autor:
M. Riedel, K. M. M. Rohr, G. D. Spence, D. Kelley, J. Delaney, L. Lapham, J. W. Pohlman, R. D. Hyndman, E. C. Willoughby
Publikováno v:
Geochemistry, Geophysics, Geosystems, Vol 21, Iss 8, Pp n/a-n/a (2020)
Abstract Geophysical and geochemical data indicate there is abundant fluid expulsion in the Nootka fault zone (NFZ) between the Juan de Fuca and Explorer plates and the Nootka continental slope. Here we combine observations from >20 years of investig
Externí odkaz:
https://doaj.org/article/1b04e190ebb241689cb873b8e6e8d7c3
Publikováno v:
Nature Communications, Vol 9, Iss 1, Pp 1-14 (2018)
Methane venting is a widespread phenomenon at the Cascadia margin, however a comprehensive database of methane vents at this margin is lacking. Here the authors show that the margin-wide average methane flow-rate ranges from ~4 × 106 to ~1590 × 106
Externí odkaz:
https://doaj.org/article/1c805d6e006f40f49d435dfab6032091
Autor:
Amilcar Vargas, Gurbir Singh, Gurpreet Kaur, Tsz Him Lo, G. D. Spencer, L. Jason Krutz, Drew M. Gholson
Publikováno v:
Agrosystems, Geosciences & Environment, Vol 7, Iss 1, Pp n/a-n/a (2024)
Abstract Crop yields are adversely affected by nitrogen (N) losses in humid subtropical regions. This study was conducted to determine whether N dynamics could be manipulated through planting geometry and fertilizer placement. The effects of irrigati
Externí odkaz:
https://doaj.org/article/97adfa4456154444ae0b36fe0759e595
High‐resolution, deep‐towed, multichannel seismic survey of deep‐sea gas hydrates off western Canada
Autor:
N. Ross Chapman, David E. Hannay, Rick Walia, Warren T. Wood, Joe Gettrust, G. D. Spence, Roy D. Hyndman
Publikováno v:
GEOPHYSICS. 67:1038-1047
A multichannel seismic survey was carried out using the high‐resolution deep‐towed acoustics/geophysics system (DTAGS) to image the structure of deep‐sea gas hydrates on the continental slope off Vancouver Island and to determine the velocity p
Autor:
G Middleton, MM Côté, G. Standen, M. Ulmi, D Manning, P J Neelands, C. D. Stacey, C. Brillon, Michael Riedel, R Murphy, R. Iuliucci, G. D. Spence
Publikováno v:
Geological Survey of Canada, Open File, 7632 ., 79 pp.
Canada's second largest instrumentally recorded earthquake occurred on October 27th, 2012, off the west coast of Moresby Island, Haida Gwaii. Analysis of seismic waveforms and the pattern of aftershocks indicate that it was a thrust earthquake with a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9e95ffacffb7aac8b4d54b293b7e69c7
https://doi.org/10.4095/295551
https://doi.org/10.4095/295551
Publikováno v:
Geophysical Journal International. 144:695-712
Publikováno v:
Pure and Applied Geophysics. 157:1315-1336
—The digital seismic network used to monitor earthquakes in southwestern British Columbia recorded explosions from Lithoprobe’s Southern Cordillera Refraction Experiment (SCoRE) in 1989 and 1990 and from the USGS Pacific Northwest Refraction Surv
Hydrate distribution off Vancouver Island from multifrequency single-channel seismic reflection data
Autor:
G. D. Spence, C. R. Fink
Publikováno v:
Journal of Geophysical Research: Solid Earth. 104:2909-2922
On the northern Cascadia margin, single channel seismic data clearly image the bottom-simulating reflector (BSR) that marks the base of the hydrate stability zone. Airguns with three distinct source frequencies (30, 75, and 150 Hz) were recorded alon