Fertile Usnea Longissima in the Oregon Coast Range

2002 ◽  
Vol 34 (1) ◽  
pp. 13-17 ◽  
Author(s):  
D. B. Keon
Keyword(s):  
Pacific Northwest ◽  
Coast Range ◽  
Oregon Coast Range ◽  
Oregon Coast ◽  
History Of ◽  
Usnea Longissima ◽  
Published Account ◽  
The U.S

AbstractApothecia from Usnea longissima thalli collected in the Oregon Coast Range are described. Fertile U. longissima specimens have seldom been observed and rarely documented in the literature. A brief history of accounts in the literature is given, and possible reasons for the infrequent occurrence of apothecia are discussed. This is the first published account of fertile U. longissima specimens in the U.S. Pacific Northwest.

Predicting deposition of debris flows in mountain channels

1990 ◽  
Vol 27 (4) ◽  
pp. 409-417 ◽  
Author(s):  
Lee E. Benda ◽  
Terrance W. Cundy
Keyword(s):  
Pacific Northwest ◽  
Debris Flows ◽  
Field Measurements ◽  
Coast Range ◽  
Oregon Coast Range ◽  
Oregon Coast ◽  
Aerial Photos ◽  
The Pacific ◽  
Channel Slope ◽  
Junction Angle

An empirical model for predicting deposition of coarse-textured debris flows in confined mountain channels is developed based on field measurements of 14 debris flows in the Pacific Northwest, U.S.A. The model uses two criteria for deposition: channel slope (less than 3.5°) and tributary junction angle (greater than 70°). The model is tested by predicting travel distances of 15 debris flows in the Oregon Coast Range and six debris flows in the Washington Cascades, U.S.A. The model is further tested on 44 debris flows in two lithological types in the Oregon Coast Range using aerial photos and topographic maps; on these flows only the approximate travel distance is known. The model can be used by resource professionals to identify the potential for impacts from debris flows. Key words: debris flow, deposition, travel, erosion.

scholarly journals Rainfall triggers more deep-seated landslides than Cascadia earthquakes in the Oregon Coast Range, USA

2020 ◽  
Vol 6 (38) ◽  
pp. eaba6790
Author(s):  
S. R. LaHusen ◽  
A. R. Duvall ◽  
A. M. Booth ◽  
A. Grant ◽  
B. A. Mishkin ◽  
...  
Keyword(s):  
Subduction Zone ◽  
Pacific Northwest ◽  
Cascadia Subduction Zone ◽  
Mean Annual Precipitation ◽  
Coast Range ◽  
Ground Acceleration ◽  
Oregon Coast Range ◽  
Oregon Coast ◽  
Subduction Zone Earthquakes ◽  
Large Earthquakes

The coastal Pacific Northwest USA hosts thousands of deep-seated landslides. Historic landslides have primarily been triggered by rainfall, but the region is also prone to large earthquakes on the 1100-km-long Cascadia Subduction Zone megathrust. Little is known about the number of landslides triggered by these earthquakes because the last magnitude 9 rupture occurred in 1700 CE. Here, we map 9938 deep-seated bedrock landslides in the Oregon Coast Range and use surface roughness dating to estimate that past earthquakes triggered fewer than half of the landslides in the past 1000 years. We find landslide frequency increases with mean annual precipitation but not with modeled peak ground acceleration or proximity to the megathrust. Our results agree with findings about other recent subduction zone earthquakes where relatively few deep-seated landslides were mapped and suggest that despite proximity to the megathrust, most deep-seated landslides in the Oregon Coast Range were triggered by rainfall.

Geologic map of the Tillamook Highlands, Northwest Oregon Coast Range

1994 ◽  
Author(s):  
R.E. Wells ◽  
P.D. Snavely ◽  
N.S. MacLeod ◽  
M.M. Kelly ◽  
M.J. Parker
Keyword(s):  
Coast Range ◽  
Oregon Coast Range ◽  
Oregon Coast ◽  
Geologic Map

FORMATION AND SEDIMENTATION OF LANDSLIDE-DAMMED LAKES WITHIN SMALL WATERSHEDS OF THE CENTRAL OREGON COAST RANGE

2017 ◽  
Author(s):  
Logan R. Wetherell ◽  
◽  
Lisa L. Ely ◽  
Megan Walsh ◽  
Joshua Roering ◽  
...  
Keyword(s):  
Coast Range ◽  
Oregon Coast Range ◽  
Oregon Coast ◽  
Small Watersheds

QUANTIFYING SEDIMENTATION PATTERNS OF SMALL LANDSLIDE-DAMMED LAKES IN THE CENTRAL OREGON COAST RANGE

2019 ◽  
Author(s):  
Logan R. Wetherell ◽  
◽  
Lisa L. Ely ◽  
Joshua Roering ◽  
Megan Walsh ◽  
...  
Keyword(s):  
Coast Range ◽  
Oregon Coast Range ◽  
Oregon Coast
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