Map of a portion of the Yukon District, North-West Territory, with the adjacent northern part of British Columbia, Sheet 1

1898 ◽  
Author(s):  
J M Evoy ◽  
L N Richard
Keyword(s):  
British Columbia ◽  
North West

Japewia Subaurifera, A New Lichen Genus and Species From North-West Europe and Western North America

1990 ◽  
Vol 22 (3) ◽  
pp. 205-212 ◽  
Author(s):  
T. Tønsberg
Keyword(s):  
British Columbia ◽  
North America ◽  
Western North America ◽  
Coniferous Trees ◽  
North West

AbstractThe genus Japewia Tønsb. is introduced to accommodate three species including J. subaurifera Muhr & Tønsb. sp. nov. based on material from Norway, Sweden, Finland, Scotland, Canada (British Columbia) and U.S.A. (Washington). This species is closely related to Lecidea tornoensis Nyl. but is distinguished in being sorediate and by the production of lobaric acid (accessory) and acetone-soluble pigments. It grows on bark of deciduous and coniferous trees. Lecidea carrollii Coppins & P. James and L. tornoensis Nyl. are transferred to Japewia.

scholarly journals Artificially Induced Thermokarst in Active Glacier Ice: An Example from North-West British Columbia, Canada

1977 ◽  
Vol 18 (80) ◽  
pp. 437-444
Author(s):  
N. Eyles ◽  
R. J. Rogerson
Keyword(s):  
Waste Water ◽  
British Columbia ◽  
Review Of The Literature ◽  
North West ◽  
Ice Melt ◽  
Basal Ice ◽  
Glacier Ice

AbstractWarm waste water, at 30°C, has been discharged from a copper concentrater on to the active terminal ice of Berendon Glacier, British Columbia, since 1970. As a result, rapid basal ice melt causes the formation of caverns and subsequent collapse features referred to as glacier thermokarst. A review of the literature reveals that such features have been described elsewhere from active ice, and the usual conditions assumed for the development of glacier thermokarst (stagnant, heavily debris-covered ice) should be redefined to include these examples.

Hydraulic fracturing operations within an extremely complex stress regime: The case of Fort St. John, British Columbia, Canada

2020 ◽  
Author(s):  
Rebecca O. Salvage ◽  
David W. Eaton
Keyword(s):  
British Columbia ◽  
Hydraulic Fracturing ◽  
Large Scale ◽  
Vertical Plane ◽  
Local Stress ◽  
Complex Stress ◽  
Tectonic Structures ◽  
Principal Stresses ◽  
Stress Regime ◽  
North West

<p>On 30 November 2018, three felt earthquakes occurred in quick succession close to the city of Fort St. John, British Columbia, likely as a direct response to a hydraulic fracturing operation in the area. Events appear tightly clustered spatially within the upper 10 km of the crust. Hypocenters locate at the confluence between a large scale reverse faulting regime (in the north-west, probably due to the influence of the Rocky Mountain fold and thrust belt) and an oblique strike slip faulting regime (in the south-east, probably due to the influence of the Fort St. John Graben), resulting in a variety of focal mechanisms and a very complex local stress regime. Further analysis of the principal stresses suggests that σ<sub>1</sub> is well constrained and close to horizontal, whereas σ<sub>2</sub> and σ<sub>3</sub> are poorly constrained, and can alternate between the horizontal and the vertical plane. Here, we present an overview of the temporal and spatial evolution of this seismic sequence and its relationship to hydraulic fracturing operations in the area, and examine the influence of large-scale regional tectonic structures on the generation of seismicity on this occasion.</p><p> </p>

Some fungal parasites of Scrophulariaceae

1968 ◽  
Vol 46 (4) ◽  
pp. 461-471 ◽  
Author(s):  
D. B. O. Savile
Keyword(s):  
British Columbia ◽  
North America ◽  
Sphaerotheca Fuliginea ◽  
North West ◽  
Fungal Parasites

Ramularia lewisii Savile sp. nov. on Mimulus lewisii in British Columbia, and Puccinia bhutanensis Savile sp. nov. on Pedicularis ? kingii in Bhutan, are described. Peronospora pedicularis, Melasmia mougeotii,Isariopsis veronicae (Pass.) Savile comb. nov., Ramularia bartsiae, and Schroeteria delastrina are newly reported in North America and Puccinia pedicularis in Canada. A small-spored Cylindrosporella, suspected to be the microconidial state of Guignardia veronicae, is newly reported from north-west North America. Host and range extensions are recorded for Peronospora grisea, Sphaerotheca fuliginea, Mycosphaerella pedicularis, Diplodina pedicularidis, Ramularia nivosa, Ramularia variabilis, Cronartium coleosporioides, Entyloma clintonianum, and E. linariae.

scholarly journals Mass Balance of South-East Alaska and North-West British Columbia Glaciers from 1976 to 1984: Methods and Results

1987 ◽  
Vol 9 ◽  
pp. 189-194 ◽  
Author(s):  
M.S. Pelto
Keyword(s):  
British Columbia ◽  
Mass Balance ◽  
Satellite Imagery ◽  
Field Studies ◽  
Balance Model ◽  
Annual Fluctuation ◽  
Surface Mass ◽  
North West ◽  
Cumulative Mass ◽  
Local Weather

The annual surface mass balance for 1983 and 1984 and the 10 year cumulative mass balances for 1975–85 were calculated for 60 south-east Alaskan and north-west British Columbia glaciers. At present, the mass balance is positive on nine, at equilibrium on nine, and negative on 42 glaciers. The ratio of glaciers with positive and equilibrium mass balance to glaciers with negative mass-balance has not changed significantly since 1946; however, the magnitude of negative balances has declined on 39 of the 42 glaciers. The annual mass balance of south-east Alaska and north-west British Columbia glaciers cannot be measured on more than a few glaciers. This paper presents the methods and results for a mass-balance model using as input local weather records, Juneau Icefield field studies, and satellite imagery. The primary variable in mass balance from one glacier to another is the budget gradient. The budget gradient varies predictably according to three parameters: ocean proximity, surface slope, and valley width-valley height. The annual fluctuation of the budget gradient can be determined by examination of local weather records, determination of activity indexes, and delineation of the equilibrium-line gradient from the maritime to the continental part of each icefield. The latter two variables are determined using largely satellite imagery, keyed to topographic maps. This procedure, where applicable, yielded mass-balance errors of ±0.16–0.22 m and 10 year cumulative mass-balance errors of ±0.08–0.15 m.

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