On the Straits of Juan de Fuca, Puget Sound; and Government Improvements on the Pacific Coast

1891 ◽  
Vol 25 (2) ◽  
pp. 420-434
Author(s):  
Bolton W. De Courcy
Keyword(s):  
Pacific Coast ◽  
Puget Sound ◽  
The Pacific ◽  
Juan De Fuca

Summary of Coastal Geologic Evidence for past Great Earthquakes at the Cascadia Subduction Zone

1995 ◽  
Vol 11 (1) ◽  
pp. 1-18 ◽  
Author(s):  
Brian F. Atwater ◽  
Alan R. Nelson ◽  
John J. Clague ◽  
Gary A. Carver ◽  
David K. Yamaguchi ◽  
...  
Keyword(s):  
British Columbia ◽  
North America ◽  
Subduction Zone ◽  
Forest Soils ◽  
Pacific Coast ◽  
Cascadia Subduction Zone ◽  
Level Change ◽  
The Past ◽  
The Pacific ◽  
Juan De Fuca

Earthquakes in the past few thousand years have left signs of land-level change, tsunamis, and shaking along the Pacific coast at the Cascadia subduction zone. Sudden lowering of land accounts for many of the buried marsh and forest soils at estuaries between southern British Columbia and northern California. Sand layers on some of these soils imply that tsunamis were triggered by some of the events that lowered the land. Liquefaction features show that inland shaking accompanied sudden coastal subsidence at the Washington-Oregon border about 300 years ago. The combined evidence for subsidence, tsunamis, and shaking shows that earthquakes of magnitude 8 or larger have occurred on the boundary between the overriding North America plate and the downgoing Juan de Fuca and Gorda plates. Intervals between the earthquakes are poorly known because of uncertainties about the number and ages of the earthquakes. Current estimates for individual intervals at specific coastal sites range from a few centuries to about one thousand years.

First Records of the Striped Bass, Morone saxatilis, in British Columbia Waters

1972 ◽  
Vol 29 (3) ◽  
pp. 337-339 ◽  
Author(s):  
C. R. Forrester ◽  
Alex E. Peden ◽  
R. M. Wilson
Keyword(s):  
British Columbia ◽  
Striped Bass ◽  
Pacific Coast ◽  
Puget Sound ◽  
Morone Saxatilis ◽  
San Juan ◽  
Barkley Sound ◽  
The Pacific

Two specimens of the striped bass (Morone saxatilis) were taken in British Columbia waters in 1971. One was taken off Port San Juan (48°30′N, 124°30′W) and one in Barkley Sound (48°58′N, 125°03′W). Previous most northerly published record for the Pacific coast was from Puget Sound, Washington.

scholarly journals HISTORY OF COLUMBIA RIVER JETTIES

2010 ◽  
Vol 1 (1) ◽  
pp. 32 ◽  
Author(s):  
R. E. Hickson ◽  
F. W. Rodolf
Keyword(s):  
United States ◽  
San Francisco ◽  
Pacific Coast ◽  
Columbia River ◽  
The United States ◽  
The Pacific ◽  
Juan De Fuca ◽  
History Of ◽  
International Boundary ◽  
The Pacific Ocean

Columbia River is the largest river on the Pacific Coast of the United States. It heads at Columbia Lake in British Columbia, about 80 miles north of the international boundary, and flows northward parallel to the summit of the Rocky Mountains for about 185 miles, thence turns back and flows generally southward through Upper and Lower Arrow Lakes and enters the United States about 25 miles west of the northeast corner of the State of Washington. Thence the river flows by a sinuous course southward, westward, and southeastward to the Oregon-Washington boundary, thence generally westward between the two states, discharging into the Pacific Ocean 583 statute miles north of San Francisco Bay and 154 miles south of the Straits of Juan de Fuca (distances computed from differences in latitude). The river has a total length of 1,210 miles, of which 750 miles are in the United States.

scholarly journals Fault locking, block rotation and crustal deformation in the Pacific Northwest

2007 ◽  
Vol 169 (3) ◽  
pp. 1315-1340 ◽  
Author(s):  
Robert McCaffrey ◽  
Anthony I. Qamar ◽  
Robert W. King ◽  
Ray Wells ◽  
Giorgi Khazaradze ◽  
...  
Keyword(s):  
North America ◽  
Shear Deformation ◽  
Pacific Northwest ◽  
Puget Sound ◽  
Vancouver Island ◽  
Block Rotation ◽  
The Pacific ◽  
Juan De Fuca ◽  
Gps Velocities ◽  
Relative Motions

Summary We interpret Global Positioning System (GPS) measurements in the northwestern United States and adjacent parts of western Canada to describe relative motions of crustal blocks, locking on faults and permanent deformation associated with convergence between the Juan de Fuca and North American plates. To estimate angular velocities of the oceanic Juan de Fuca and Explorer plates and several continental crustal blocks, we invert the GPS velocities together with seafloor spreading rates, earthquake slip vector azimuths and fault slip azimuths and rates. We also determine the degree to which faults are either creeping aseismically or, alternatively, locked on the block-bounding faults. The Cascadia subduction thrust is locked mainly offshore, except in central Oregon, where locking extends inland. Most of Oregon and southwest Washington rotate clockwise relative to North America at rates of 0.4–1.0 ° Myr−1. No shear or extension along the Cascades volcanic arc has occurred at the mm/yr level during the past decade, suggesting that the shear deformation extending northward from the Walker Lane and eastern California shear zone south of Oregon is largely accommodated by block rotation in Oregon. The general agreement of vertical axis rotation rates derived from GPS velocities with those estimated from palaeomagnetic declination anomalies suggests that the rotations have been relatively steady for 10–15 Ma. Additional permanent dextral shear is indicated within the Oregon Coast Range near the coast. Block rotations in the Pacific Northwest do not result in net westward flux of crustal material—the crust is simply spinning and not escaping. On Vancouver Island, where the convergence obliquity is less than in Oregon and Washington, the contractional strain at the coast is more aligned with Juan de Fuca—North America motion. GPS velocities are fit significantly better when Vancouver Island and the southern Coast Mountains move relative to North America in a block-like fashion. The relative motions of the Oregon, western Washington and Vancouver Island crustal blocks indicate that the rate of permanent shortening, the type that causes upper plate earthquakes, across the Puget Sound region is 4.4 ± 0.3 mm yr−1. This shortening is likely distributed over several faults but GPS data alone cannot determine the partitioning of slip on them. The transition from predominantly shear deformation within the continent south of the Mendocino Triple Junction to predominantly block rotations north of it is similar to changes in tectonic style at other transitions from shear to subduction. This similarity suggests that crustal block rotations are enhanced in the vicinity of subduction zones possibly due to lower resisting stress.

scholarly journals Tidal Resonance in Juan de Fuca Strait and the Strait of Georgia

2005 ◽  
Vol 35 (7) ◽  
pp. 1279-1286 ◽  
Author(s):  
Graig Sutherland ◽  
Chris Garrett ◽  
Mike Foreman
Keyword(s):  
Numerical Models ◽  
Puget Sound ◽  
Dissipative System ◽  
Tidal Elevation ◽  
Strait Of Georgia ◽  
The Pacific ◽  
Juan De Fuca ◽  
Resonant Period ◽  
Quality Factor Q ◽  
Juan De Fuca Strait

Abstract The resonant period and quality factor Q are determined for the semienclosed sea comprising Juan de Fuca Strait, Puget Sound, and the Strait of Georgia. The observed tidal elevation gain and phase change, from the Pacific Ocean to this inland sea, are fitted to the predictions of simple analytic models, which give a resonant period of 17–21 h and a Q of about 2. The low Q value, indicative of a highly dissipative system, is consistent with the need for numerical models for the area to employ large bottom friction coefficients. These include the effects of form drag.

The Recent Introduction of the Seagrass Zostera japonica Aschers. and Graebn. to the Pacific Coast of North America

1982 ◽  
Vol 39 (12) ◽  
pp. 1642-1648 ◽  
Author(s):  
Paul Garth Harrison ◽  
Richard E. Bigley
Keyword(s):  
Seed Germination ◽  
Pacific Coast ◽  
Puget Sound ◽  
Zostera Japonica ◽  
Strait Of Georgia ◽  
The Pacific ◽  
Coos Bay ◽  
Buried Seeds ◽  
Leafy Shoots ◽  
Oyster Cultivation

The seagrass Zostera japonica Aschers. and Graebn., recently introduced to British Columbia, Washington, and Oregon, is smaller than the native eelgrass Z. marina L.; grows intertidally where Z. marina is rare; and is an annual, overwintering as buried seeds, or a short-lived perennial, whereas the longer-lived perennial Z. marina usually overwinters as leafy shoots. Establishment of new populations of Z. japonica occurs mainly by seed germination although the chance of a seedling surviving its first summer is small. Once established, patches expand in area exponentially in spring and may help to stabilize the sediment. The fact that several areas where Z. japonica is abundant are or were sites of intensive oyster cultivation suggests that the plant was introduced as a contaminant (probably seeds) in shipments of Japanese oysters in the first few decades of the 20th century. Now common on the central coast of Washington, in northern Puget Sound, and in the southern Strait of Georgia, Z. japonica occurs as far south as Coos Bay, Oregon, and has the potential to spread further north and south.Key words: biogeography, distribution, establishment, introduction, oyster culture, seagrass, Zostera americana, Zostera japonica

The Philological Association of The Pacific Coast

PMLA ◽  
1935 ◽  
Vol 50 (4) ◽  
pp. 1373-1374
Keyword(s):  
Annual Meeting ◽  
Pacific Coast ◽  
Stanford University ◽  
The Pacific

The thirty-seventh annual meeting of the Philological Association of the Pacific Coast was held at Stanford University, California, on November 29 and 30, 1935.

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