High-Frequency Ground-Motion Scaling in the Pacific Northwest and in Northern and Central California

2008 ◽  
Vol 98 (2) ◽  
pp. 709-721 ◽  
Author(s):  
A. Fatehi ◽  
R. B. Herrmann
Keyword(s):  
Ground Motion ◽  
Pacific Northwest ◽  
High Frequency ◽  
Central California ◽  
The Pacific ◽  
Motion Scaling ◽  
Ground Motion Scaling

Preliminary High-Frequency Ground-Motion Scaling in Yunnan and Southern Sichuan, China

2010 ◽  
Vol 100 (5B) ◽  
pp. 2508-2517 ◽  
Author(s):  
Y. Xu ◽  
R. B. Herrmann ◽  
C.-Y. Wang ◽  
S. Cai
Keyword(s):  
Ground Motion ◽  
High Frequency ◽  
Motion Scaling ◽  
Ground Motion Scaling

scholarly journals Evaluation of the Ground Motion Scaling Procedures for Concrete Gravity Dams

2017 ◽  
Vol 199 ◽  
pp. 844-849
Author(s):  
Berat Feyza Soysal ◽  
Bekir Özer Ay ◽  
Yalin Arici
Keyword(s):  
Ground Motion ◽  
Gravity Dams ◽  
Concrete Gravity Dams ◽  
Motion Scaling ◽  
Ground Motion Scaling

Hybridization between Gulls (Larus glaucescens and L. occidentalis) in the Pacific Northwest

The Auk ◽  
1978 ◽  
Vol 95 (3) ◽  
pp. 441-458 ◽  
Author(s):  
Wayne Hoffman ◽  
John A. Wiens ◽  
J. Michael Scott
Keyword(s):  
Pacific Northwest ◽  
High Frequency ◽  
Equilibrium System ◽  
Mixed Composition ◽  
Mating Patterns ◽  
Hybrid Individual ◽  
Breeding Populations ◽  
The Pacific ◽  
Wing Tip ◽  
Larus Glaucescens

Abstract Interbreeding between Glaucous-winged Gulls (Larus glaucescens) and Western Gulls (L. occidentalis) occurs extensively within a 180-km zone along the Washington coast, producing a high frequency of intermediate morphs in breeding populations. We conducted intensive studies on Destruction Island, Washington, in the midst of the zone of hybridization. There over half of the breeding birds were phenotypically intergrades between pure Glaucous-winged and Western gulls in characters of iris and eye-ring coloration, mantle shade, and wing tip pattern. Mating patterns of Destruction Island gulls were assortative, individuals pairing with mates similar to themselves. Pairs composed of pure Glaucous-winged or Western gulls hatched significantly fewer eggs than pairs containing at least one hybrid individual. The greater apparent reproductive success of the intergrades would seem to be countered by the assortative mating patterns, possibly providing conditions sufficient to maintain an equilibrium system containing both pure types as well as intergrades. These conditions are explored in a simulation model that considered immigration, density-dependent fecundity, pairing and reproduction, and mortality. A stable colony of mixed composition may be maintained by a regular but small influx of pure types into the colony.

Sign in / Sign up

Export Citation Format

Share Document