Preliminary interpretation of the first refraction arrivals in Gaspé from shots in Labrador and Quebec

1969 ◽  
Vol 6 (4) ◽  
pp. 771-774 ◽  
Author(s):  
Douglas S. Rankin ◽  
Ravi Ravindra ◽  
David Zwicker
Keyword(s):  
Upper Mantle ◽  
Arrival Time ◽  
The South ◽  
North Shore ◽  
The North ◽  
A Value ◽  
South Shore ◽  
Compressional Velocity ◽  
St Lawrence River

Previous work in the Gulf of St. Lawrence has yielded an unusually high upper-mantle compressional velocity. In the Gaspé area a more recent determination has yielded a value of 8.75 ± 0.20 km/s for an unreversed profile. The arrival time at a station on the north shore of the St. Lawrence River suggests that there is no major difference in velocity and depth relative to the south shore.

Lateral variations in upper crustal structure below the La Malbaie area from slowness, azimuth, and traveltime measurements of telleseisms

1977 ◽  
Vol 14 (10) ◽  
pp. 2284-2293 ◽  
Author(s):  
D. J. Hearty ◽  
R. F. Mereu ◽  
C. Wright
Keyword(s):  
Precambrian Basement ◽  
Precambrian Rock ◽  
The South ◽  
Local Seismicity ◽  
North Shore ◽  
The North ◽  
South Shore ◽  
Lateral Variations ◽  
Teleseismic Events ◽  
St Lawrence River

A temporary seismic network located in the La Malbaie region of eastern Quebec during the summer of 1974 for studying the local seismicity of the area was used as a seismic array to measure directly the slowness and azimuth of the P arrivals from 18 teleseismic events. A consistent bias in the arrival vectors was observed for rays approaching the array from the south (i.e. azimuths 181°–227°). This bias can be explained by a thickening of sedimentary strata beneath the south shore of the St. Lawrence River as opposed to the outcropping Precambrian basement rock on the north shore. The sedimentary accumulation can be interpreted in terms of a sloping interface located under the network between sediments and Precambrian rock or a thick horizontal sedimentary layer underlying the south shore of the St. Lawrence River.

scholarly journals La mer de Goldthwait au Québec

2010 ◽  
Vol 31 (1-2) ◽  
pp. 61-80 ◽  
Author(s):  
Jean-Claude Dionne
Keyword(s):  
Quebec City ◽  
The South ◽  
Lawrence Estuary ◽  
Marine Invasion ◽  
North Shore ◽  
The North ◽  
Upper Limit ◽  
South Shore ◽  
Anticosti Island ◽  
St Lawrence Estuary

The Goldthwait Sea is defined as the late- and post-Glacial marine invasion in the St. Lawrence Estuary and Gulf east of Québec City. In Québec, this sea has submerged an area of about 25 000 km2. The largest areas submerged are the north shore of the St. Lawrence between Les Escoumins and Blanc-Sablon, the south shore between Levis and Tourelles, and the Anticosti Island. The upper limit of the Goldthwait Sea varies from place to place. The Goldthwait Sea began 14 000 years ago and land emergence is still in progress, since the pre-Wisconsin marine level has not been recovered yet. For a better chronology, this long interval needs to be subdivided. Three main periods have been recognized: Goldthwaitian I, II and III. However, a geographical subdivision is also needed. Numerous shorelines were observed at various elevations throughout the area formely submerged by the Goldthwait Sea. However, only a few shorelines are well developed and extensive, and correlations between former shorelines are difficult to establish. Only three levels are widespead and common to the Estuary and parts of the Gulf. The isostatic recovery has been rapid during the first three thousand years after déglaciation of the area: about 75%.

The General Oceanography of the Strait of Belle Isle

1954 ◽  
Vol 11 (3) ◽  
pp. 198-260 ◽  
Author(s):  
A. G. Huntsman ◽  
W. B. Bailey ◽  
H. B. Hachey
Keyword(s):  
Shallow Water ◽  
The South ◽  
Hydrographic Data ◽  
Arctic Water ◽  
Tidal Period ◽  
North Shore ◽  
The North ◽  
Labrador Current ◽  
South Shore ◽  
North And South

Hydrographic data for late August, 1923, show for the Strait (a) progressive inward movement on the north side of Arctic or sub-Arctic water, (b) progressive outward movement on the south side of Gulf water and (c) a dominant outward flow with evidence of a previous dominant inward flow. Time differences suggest tidal causes for the marked temperature and salinity changes. Current measurements for a double tidal period indicate residual trends of nine and eight miles per day in opposite directions on the north and south sides of the Strait. Inside, the Esquiman Channel shows two contra-clockwise eddies north and south of the Mekattina Bank. In addition, hydrographic data show a strong northeasterly movement along the Newfoundland shore and a weaker southwesterly one along the opposite Quebec shore.Planktonic animals indicate the water movements, Mertensia, Acartia spiniremis, Themisto, Pseudalibrotus and Oikopleura vanhöffeni surviving to various degrees in the water from the Labrador Current that reaches the centre of the Gulf along the north shore of the Strait and Channel. Other forms characterize the warm shallow water along the Newfoundland shore inside the Strait and show its movement outward to the east coast of Newfoundland. The Greenland seal fishery of winter reflects the inward movement from the Labrador Current. Cod and herring fisheries invade this cool water of the north shore only locally in summer with access of warmer water from the south shore. Lobsters and cunners are very abundant in, but particularly confined to, the warm shallow water mentioned above.

scholarly journals Impacts of Agricultural Areas on Spatio-Temporal Variability of Daily Minimum Extreme Flows during the Transitional Seasons (Spring and Fall) in Southern Quebec

Water ◽  
2021 ◽  
Vol 13 (24) ◽  
pp. 3487
Author(s):  
Ali Arkamose Assani ◽  
Ayoub Zeroual ◽  
Alexandre Roy ◽  
Christophe Kinnard
Keyword(s):  
Temporal Variability ◽  
The South ◽  
Extreme Flows ◽  
North Shore ◽  
Daily Minimum ◽  
The North ◽  
South Shore ◽  
Spatio Temporal ◽  
The 1960S ◽  
Agricultural Areas

Several statistical methods were used to analyze the spatio-temporal variability of daily minimum extreme flows (DMEF) in 17 watersheds—divided into three homogenous hydroclimatic regions of southern Quebec—during the transitional seasons (spring and fall), during the 1930–2019 period. Regarding spatial variability, there was a clear difference between the south and north shores of the St. Lawrence River, south of 47° N. DMEF were lower in the more agricultural watersheds on the south shore during transitional seasons compared to those on the north shore. A correlation analysis showed that this difference in flows was mainly due to more agricultural areas ((larger area (>20%) on the south than on the north shore (<5%)). An analysis of the long-term trend of these flows showed that the DMEF of south-shore rivers have increased significantly since the 1960s, during the fall (October to December), due to an increase in rainfall and a reduction in cultivated land, which increased the infiltration in the region. Although there was little difference between the two shores in the spring (April to June), we observed a decrease in minimum extreme flows in half (50%) of the south-shore rivers located north of 47° N.

Distribution of Enteric Bacteria in the Quebec City Section of the St-Lawrence River

1974 ◽  
Vol 9 (1) ◽  
pp. 107-114
Author(s):  
Ronald E. Simard ◽  
John A. Zee
Keyword(s):  
Fecal Coliform ◽  
Enteric Bacteria ◽  
Quebec City ◽  
Klebsiella Pneumonia ◽  
North Shore ◽  
The North ◽  
South Shore ◽  
Total Bacteria ◽  
St Lawrence River ◽  
Made In

Abstract During the summer of 1973, a survey was made in order to establish the level of enteric bacteria in the sediments and water of the St-Lawrence River. In the sediments, the number of total bacteria, yeast and mold fluctuates from station to station and with the tide. Higher counts of total and fecal coliform were encountered on the north shore than on the south shore resulting from Quebec City sewerage. The number of fecal bacteria decreased when approaching the Gulf and their number was higher at rising tide. The main species encountered were Klebsiella pneumonia, Salmonella enteridis and Escherichia spp.

Relationship between the Atlantic Multidecadal Oscillation index and variability of mean annual flows for catchments in the St. Lawrence watershed (Quebec, Canada) during the past century

2010 ◽  
Vol 41 (2) ◽  
pp. 115-125 ◽  
Author(s):  
Ali A. Assani ◽  
David Landais ◽  
Mhamed Mesfioui ◽  
Martin Matteau
Keyword(s):  
Temporal Variability ◽  
Atlantic Multidecadal Oscillation ◽  
Past Century ◽  
Left Bank ◽  
The South ◽  
North Shore ◽  
The North ◽  
South Shore ◽  
Atlantic Multidecadal Oscillation Index ◽  
Continental Climate

This paper, based on an analysis of the mean annual flow (MAF) of 16 natural rivers over the period 1934–2000, has the following goals: (1) to determine the different temporal variability modes of the MAF in the St. Lawrence watershed, (2) to describe the temporal variability of the streamflow in each mode and (3) to analyze the influence of the AMO (Atlantic Multidecadal Oscillation) on the interannual and interdecadal variability of mean annual flows in this Quebec watershed. This paper shows that the interannual variability of mean annual flow was not synchronous on both sides of the river. During the period analyzed, MAF variability was characterized by a tendency to decrease on the south shore (right bank) but to increase on the north shore (left bank). A correlation analysis reveals that the influence of the AMO was limited exclusively to the north shore of the river, which is characterized by a continental climate. This correlation is negative. On the south shore, streamflow is correlated negatively to the AO (Arctic Oscillation).

Loadings of Selected Chemicals into the St. Lawrence River System from Lake Ontario, 1986/87

1989 ◽  
Vol 24 (4) ◽  
pp. 589-608 ◽  
Author(s):  
I.K. Tsanis ◽  
J. Biberhofer ◽  
C.R. Murthy ◽  
A. Sylvestre
Keyword(s):  
Mass Balance ◽  
Lake Ontario ◽  
River System ◽  
Vertical Gradient ◽  
The South ◽  
Measured Concentration ◽  
Chemical Monitoring ◽  
The North ◽  
Loading Estimates ◽  
St Lawrence River

Abstract Determination of the mass output through the St. Lawrence River outflow system is an important component in computing mass balance of chemical loadings to Lake Ontario. The total flow rate in the St. Lawrence River System at the Wolfe Island area was calculated from detailed time series current meter measurements from a network of current meters and Lagrangian drifter experiments. This flow is roughly distributed in the ratio of 55% to 45% in the South and North channel, respectively. Loading estimates of selected chemicals have been made by combining the above transport calculations with the ongoing chemical monitoring data at the St. Lawrence outflow. A vertical gradient in the concentration of some organic and inorganic chemicals was observed. The measured concentration for some of the chemicals was higher during the summer months and also is higher in the South Channel than in the North Channel of the St. Lawrence River. These loading estimates are useful not only for modelling the mass balance of chemicals in Lake Ontario but also for serving as input loadings to the St. Lawrence River system from Lake Ontario.

Seismicity and faulting in the Charlevoix zone of the St. Lawrence Valley

1984 ◽  
Vol 74 (2) ◽  
pp. 595-603
Author(s):  
F. M. Anglin
Keyword(s):  
Active Zone ◽  
Continuous Monitoring ◽  
North Shore ◽  
The North ◽  
Earthquake Zone ◽  
St Lawrence River

Abstract Continuous monitoring of the seismically active Charlevoix zone since late 1977 has delineated the boundaries of the earthquake zone under the north shore and has enabled an association to be made with surface mapped faults that strike along the St. Lawrence Valley and dip to the southeast. Within the active zone, aseismic volumes are found under parts of the St. Lawrence River and another elongated zone of activity is found to the southeast on unmapped faults dipping under the river. The previous suggestions that the activity is related to old rift faults, which have been later weakened by a meteor impact, would seem to be upheld.

The Second Crusade as Seen by Contemporaries

Traditio ◽  
1953 ◽  
Vol 9 ◽  
pp. 213-279 ◽  
Author(s):  
Giles Constable
Keyword(s):  
North Coast ◽  
Holy Land ◽  
The South ◽  
The West ◽  
The Balkans ◽  
The North ◽  
River Elbe ◽  
Medieval Europe ◽  
South Shore ◽  
Naval Force

The years between 1146 and 1148 were signalized in the annals and chronicles of Medieval Europe by Christian campaigns on all fronts against the surrounding pagans and Moslems. The most important of these was directed towards the Holy Land, against the Moslems, who had recently seized Edessa. It consisted of no less than five expeditions. The two largest armies, commanded by the Emperor Conrad III and King Louis VII of France, followed the same route overland across the Balkans to Constantinople; both met with crushing defeats in Asia Minor and finally reached the Holy Land, as best they could, by land and sea. A third force, under Amadeus III of Savoy, moved down Italy, crossed from Brindisi to Durazzo, and joined the army of Louis at Constantinople late in 1147. In August of the same year a naval expedition led by Alfonso of Toulouse left the South of France and arrived in Palestine probably in the spring of 1148. At the same time, a joint Anglo-Flemish naval force sailed along the north coast of Europe, assisted the King of Portugal in the capture of Lisbon, proceeded around the peninsula early in 1148, attacked Faro, and presumably reached the Holy Land later that year. Meanwhile, in the northeast, four armies co-operated in a campaign against the pagan Wends across the river Elbe: a Danish army joined the Saxons under Henry the Lion and Archbishop Adalbero of Bremen in an attack on Dubin; another, larger, army led by Albert the Bear of Brandenburg and many other temporal and spiritual lords advanced against Demmin and Stettin; a fourth expedition, finally, under a brother of the Duke of Poland attacked from the southeast. In 1148, on the south shore of the Mediterranean, a powerful fleet under George of Antioch extended the control of Roger II of Sicily over the entire littoral from Tripoli to Tunis. In the West, four campaigns were directed against the crumbling power of the Almoravides. The Genoese in 1146 sacked Minorca and besieged Almeria. During the following year, the Emperor Alfonso VII of Castile advanced south through Andalusia and captured Almeria with the aid of a strong Genoese fleet, which in 1148 sailed north and joined the Count of Barcelona in his campaign against Tortosa. In the previous year, Alfonso Henriques of Portugal had captured Santarem and secured the assistance of the Anglo-Flemish fleet for an attack on Lisbon, which fell late in 1147.

Petrochemical and stratigraphic aspects of North Mountain basalt from the north shore of the Bay of Fundy, Nova Scotia, Canada

1989 ◽  
Vol 26 (12) ◽  
pp. 2710-2717 ◽  
Author(s):  
John D. Greenough ◽  
Lois M. Jones ◽  
David J. Mossman
Keyword(s):  
Major Element ◽  
Sedimentary Rocks ◽  
Bay Of Fundy ◽  
Average Composition ◽  
North Shore ◽  
The North ◽  
Flow Units ◽  
Lateral Extent ◽  
South Shore ◽  
Magma Migration

Early Jurassic quartz-normative tholeiitic basalts occur in a series of fault blocks at four localities (Cap d'Or, Parrsboro, Five Islands, and Bass River) along the north shore of the Bay of Fundy. Major-element and trace-element data show that they represent outliers of the North Mountain basalt (NMB), which from the south shore of the Bay of Fundy are well-known. Diagnostic 87Sr/86Sr ratios (≈0.70609) indicate that a thick (>90 m) flow at Five Islands and Cap d'Or represents the lower unit of NMB, thus extending this single flow's lateral extent to 230 km. Thin flows overlying the thick flow at Cap d'Or suggest that the middle unit of NMB also occurs on the north shore. A thick flow at McKay Head (Parrsboro area) shows a variable Sr isotopic composition that is probably a result of metasomatism (with Rb addition) along the Cobequid fault. The average composition (0.70656) is similar to that of the upper unit of NMB. If the flow does represent the upper unit, then four thinner flows above it form an "overlying unit" not recognized along North Mountain. Although the nature of contacts between the middle and upper units was not observed, a lack of sedimentary rocks between all other flow units indicates that little or no sedimentation occurred between basalt eruptions. North shore basalts appear less mafic (more evolved) than south shore basalts, providing support for the hypothesis of differentiation during northeasterly magma migration through dykes that fed 230 km long fissure eruptions.

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