A 12,000-year record of vertical deformation across the Yellowstone caldera margin: The shorelines of Yellowstone Lake

1994 ◽  
Vol 99 (B10) ◽  
pp. 20079-20094 ◽  
Author(s):  
William W. Locke ◽  
Grant A. Meyer
Keyword(s):  
Vertical Deformation ◽  
Yellowstone Lake ◽  
Yellowstone Caldera

scholarly journals Post-glacial inflation-deflation cycles, tilting, and faulting in the Yellowstone Caldera based on Yellowstone Lake shorelines

2002 ◽  
Author(s):  
Kenneth L. Pierce ◽  
Kenneth P. Cannon ◽  
Grant A. Meyer ◽  
Matthew J. Trebesch ◽  
Raymond D. Watts
Keyword(s):  
Yellowstone Lake ◽  
Yellowstone Caldera

Heat flow measurements in Yellowstone Lake and the thermal structure of the Yellowstone Caldera

1977 ◽  
Vol 82 (26) ◽  
pp. 3719-3732 ◽  
Author(s):  
Paul Morgan ◽  
David D. Blackwell ◽  
Robert E. Spafford ◽  
Robert B. Smith
Keyword(s):  
Heat Flow ◽  
Thermal Structure ◽  
Flow Measurements ◽  
Yellowstone Lake ◽  
Yellowstone Caldera

scholarly journals ERRONEOUSLY OLD RADIOCARBON AGES FROM TERRESTRIAL POLLEN CONCENTRATES IN YELLOWSTONE LAKE, WYOMING, USA

Radiocarbon ◽  
2020 ◽  
pp. 1-22
Author(s):  
Christopher M Schiller ◽  
Cathy Whitlock ◽  
Kathryn L Elder ◽  
Nels A Iverson ◽  
Mark B Abbott
Keyword(s):  
Pollen Grains ◽  
Water Interface ◽  
Satisfactory Explanation ◽  
Yellowstone Lake ◽  
Carbon Contamination ◽  
Terrestrial Plant ◽  
Plant Remains ◽  
Sediment Records ◽  
Ams Dating ◽  
Yellowstone Caldera

ABSTRACT Accelerator mass spectrometry (AMS) dating of pollen concentrates is often used in lake sediment records where large, terrestrial plant remains are unavailable. Ages produced from chemically concentrated pollen as well as manually picked Pinaceae grains in Yellowstone Lake (Wyoming) sediments were consistently 1700–4300 cal years older than ages established by terrestrial plant remains, tephrochronology, and the age of the sediment-water interface. Previous studies have successfully utilized the same laboratory space and methods, suggesting the source of old-carbon contamination is specific to these samples. Manually picking pollen grains precludes admixture of non-pollen materials. Furthermore, no clear source of old pollen grains occurs on the deglaciated landscape, making reworking of old pollen grains unlikely. High volumes of CO2 are degassed in the Yellowstone Caldera, potentially introducing old carbon to pollen. While uptake of old CO2 through photosynthesis is minor (F14C approximately 0.99), old-carbon contamination may still take place in the water column or in surficial lake sediments. It remains unclear, however, what mechanism allows for the erroneous ages of highly refractory pollen grains while terrestrial plant remains were unaffected. In the absence of a satisfactory explanation for erroneously old radiocarbon ages from pollen concentrates, we propose steps for further study.

Numerical Analysis of Bridge Expansion-Induced Rail Deformation of Ballast Truck

2014 ◽  
Vol 580-583 ◽  
pp. 3208-3214 ◽  
Author(s):  
Zhen Wei Xiong ◽  
Xin Ling Liang ◽  
Xian Xing Dai ◽  
Ping Wang
Keyword(s):  
Granular Flow ◽  
Element Model ◽  
Discrete Element Model ◽  
Board Structure ◽  
Vertical Deformation ◽  
Two Dimensional ◽  
Running Safety ◽  
Bridge Plate ◽  
Ballast Track ◽  
The Relationship

when the ballast track stretch with the bridge, ballast which is near expansion joint will move confusedly. As a result, rail produced vertical deformation. The deformation will affect the running safety and comfortability of train. At present, there are two kinds of treatments which are cover board structure and baffle structure to deal ballast’s movement. Aiming at the different modes of stretching when the two kinds of structures and different arrangement condition of bridge plate are applied, the rail-sleeper-ballast discrete element model is developed by the method of two-dimensional granular flow. The relationship between rail deformation and bridge expansion is analyzed on the foundation of the model. Results show as flows: when bridge extends or shortens, rail always produced upwarp deformation. Bridge plate should arrange asymmetrically. Like this, the rail deformation decrease by 40%. And adopting the baffle structure can effectively reduce the influence of bridge expansion in ballast truck.

EFFECTS OF RIVER OTTER ACTIVITY ON TERRESTRIAL PLANTS IN TROPHICALLY ALTERED YELLOWSTONE LAKE

Ecology ◽  
2007 ◽  
Vol 88 (4) ◽  
pp. 1040-1052 ◽  
Author(s):  
Jamie R. Crait ◽  
Merav Ben-David
Keyword(s):  
River Otter ◽  
Terrestrial Plants ◽  
Yellowstone Lake

scholarly journals Effect of Thickness of Gravel Base and Asphalt Pavement on Road Deformation

2018 ◽  
Vol 2018 ◽  
pp. 1-7 ◽  
Author(s):  
Dongliang He ◽  
Weijun Yang
Keyword(s):  
Numerical Calculation ◽  
Test Section ◽  
Asphalt Pavement ◽  
Road Surface ◽  
Vertical Deformation ◽  
The Road ◽  
Design Requirements ◽  
The Relationship

This study uses a test section of a highway, a study object, to explore the effect of thickness of the gravel base and asphalt layer on the vertical deformation of the road surface. The thickness of the asphalt layer and graded gravel base is changed. The nonlinear description equation of the relationship between the thickness (h1) of the asphalt layer and the vertical deformation (d1) is established: d1=a41−b4h1. The thickness of the asphalt pavement is then determined to reduce vertical deformation. Numerical calculation shows that the maximum vertical deformation of the foundation is within 8 mm, which is less than the 15 mm maximum vertical deformation of the embankment. This level meets the design requirements.

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