Mount Adams

The Art World ◽  
1917 ◽  
Vol 2 (1) ◽  
pp. 21
Author(s):  
Phoebe Hoffman
Keyword(s):  
Mount Adams

Discriminating assimilants and decoupling deep- vs. shallow-level crystal records at Mount Adams using 238U–230Th disequilibria and Os isotopes

2009 ◽  
Vol 277 (1-2) ◽  
pp. 38-49 ◽  
Author(s):  
Brian R. Jicha ◽  
Clark M. Johnson ◽  
Wes Hildreth ◽  
Brian L. Beard ◽  
Garret L. Hart ◽  
...  
Keyword(s):  
Shallow Level ◽  
Os Isotopes ◽  
Mount Adams

Recent eruptions of Mount Adams, Washington Cascades, USA

1997 ◽  
Vol 58 (6) ◽  
pp. 472-490 ◽  
Author(s):  
Wes Hildreth ◽  
Judy Fierstein
Keyword(s):  
Mount Adams ◽  
Washington Cascades

scholarly journals Twentieth Century Glacier Change on Mount Adams, Washington, USA

2010 ◽  
Vol 84 (4) ◽  
pp. 378-385 ◽  
Author(s):  
Danielle J. Sitts ◽  
Andrew G. Fountain ◽  
Matthew J. Hoffman
Keyword(s):  
Twentieth Century ◽  
Glacier Change ◽  
Mount Adams

scholarly journals Volcano hazards in the Mount Adams region, Washington

1995 ◽  
Author(s):  
W.E. Scott ◽  
R.M. Iverson ◽  
J.W. Vallance ◽  
Wes Hildreth
Keyword(s):  
Volcano Hazards ◽  
Mount Adams

Comparison of Conventional K–Ar and 40Ar/39Ar Dating of Young Mafic Volcanic Rocks

2000 ◽  
Vol 53 (3) ◽  
pp. 294-301 ◽  
Author(s):  
Marvin A. Lanphere
Keyword(s):  
Crater Lake ◽  
Volcanic Rocks ◽  
Snake River Plain ◽  
High Quality ◽  
Modern Equipment ◽  
Suitable Material ◽  
Mount Adams ◽  
River Plain ◽  
Isotope Correlation ◽  
Better Than

AbstractK–Ar and 40Ar/39Ar ages have been measured on nine mafic volcanic rocks younger than 1 myr from the Snake River Plain (Idaho), Mount Adams (Washington), and Crater Lake (Oregon). The K–Ar ages were calculated from Ar measurements made by isotope dilution and K2O measurements by flame photometry. The 40Ar/39Ar ages are incremental-heating experiments using a low-blank resistance-heated furnace. The results indicate that high-quality ages can be measured on young, mafic volcanic rocks using either the K–Ar or the 40Ar/39Ar technique. The precision of an 40Ar/39Ar plateau age generally is better than the precision of a K–Ar age because the plateau age is calculated by pooling the ages of several gas increments. The precision of a plateau age generally is better than the precision of an isotope correlation (isochron) age for the same sample. For one sample the intercept of the isochron yielded an 40Ar/36Ar value significantly different from the atmospheric value of 295.5. Recalculation of increment ages using the isochron intercept for the composition of nonradiogenic Ar in the sample resulted in much better agreement of ages for this sample. The results of this study also indicate that, given suitable material and modern equipment, precise K–Ar and 40Ar/39Ar ages can be measured on volcanic rocks as young as the latest Pleistocene, and perhaps even the Holocene.

Altitudinal differentiation between adjacent populations of a ground beetle, Elaphrus americanus Dejean (Coleoptera: Carabidae: Elaphrini)

1982 ◽  
Vol 60 (8) ◽  
pp. 1930-1939
Author(s):  
Henry Frania
Keyword(s):  
Pacific Northwest ◽  
Temperate Forest ◽  
Ground Beetle ◽  
Aldehyde Oxidase ◽  
Body Colour ◽  
Forest Sites ◽  
The Pacific ◽  
Mount Rainier ◽  
Disjunct Populations ◽  
Mount Adams

Samples of Elaphrus americanus from five mountains in the Pacific Northwest were compared for variation in two enzymes (an esterase and an aldehyde oxidase) and a body colour polymorphism. There were significant differences in all three characters between subalpine parkland and temperate forest samples from Mount Rainier and Mount Baker (Washington) and Tusk Mountain (British Columbia). There were no differences between subalpine and temperate forest samples from Mount Adams (Washington) and Mount Hood (Oregon). Subalpine parkland samples from Baker differed from Tusk parkland samples in one character and from Rainier parkland samples in two characters. Differences between forest samples were slight. Large differences over short distances were not expected because dispersal between sites in forest areas is frequent. Parkland populations on Rainier, Baker, and Tusk mountains may be reproductively isolated from adjacent forest populations and could constitute disjunct populations of a sibling species that was widespread in the Pleistocene. Alternatively, subalpine parkland and forest populations may not be reproductively isolated from one another and differences between them are being maintained by selection. Parkland populations on one or more mountains may have diverged independently of the others. Beetles found in parkland areas on Hood and Adams mountains probably dispersed from forest sites.

scholarly journals A Pilot Experiment on Infrasonic Lahar Detection at Mount Adams, Cascades: Ambient Infrasound and Wind-Noise Characterization at a Quiescent Stratovolcano

2021 ◽  
Author(s):  
Richard W. Sanderson ◽  
Robin S. Matoza ◽  
Rachel M. Haymon ◽  
Jamison H. Steidl
Keyword(s):  
Debris Flows ◽  
Mass Movement ◽  
Hydrothermal Activity ◽  
Mass Wasting ◽  
Wind Noise ◽  
Pilot Experiment ◽  
Flow Speeds ◽  
Mount Adams ◽  
Downstream Communities ◽  
Noisy Background

Abstract Erosion, hydrothermal activity, and magmatism at volcanoes can cause large and unexpected mass wasting events. Large fluidized debris flows have occurred within the past 6000 yr at Mount Adams, Washington, and present a hazard to communities downstream. In August 2017, we began a pilot experiment to investigate the potential of infrasound arrays for detecting and tracking debris flows at Mount Adams. We deployed a telemetered four-element infrasound array (BEAR, 85 m aperture), ~11 km from a geologically unstable area where mass wasting has repeatedly originated. We present a preliminary analysis of BEAR data, representing a survey of the ambient infrasound and noise environment at this quiescent stratovolcano. Array processing reveals near continuous and persistent infrasound signals arriving from the direction of Mount Adams, which we hypothesize are fluvial sounds from the steep drainages on the southwest flank. We interpret observed fluctuations in the detectability of these signals as resulting from a combination of (1) wind-noise variations at the array, (2) changes in local infrasound propagation conditions associated with atmospheric boundary layer variability, and (3) changing water flow speeds and volumes in the channels due to freezing, thawing, and precipitation events. Suspected mass movement events during the study period are small (volumes <105  m3 and durations <2 min), with one of five visually confirmed events detected infrasonically at BEAR. We locate this small event, which satellite imagery suggests was a glacial avalanche, using three additional temporary arrays operating for five days in August 2018. Events large enough to threaten downstream communities would likely produce stronger infrasonic signals detectable at BEAR. In complement to recent literature demonstrating the potential for infrasonic detection of volcano mass movements (Allstadt et al., 2018), this study highlights the practical and computational challenges involved in identifying signals of interest in the expected noisy background environment of volcanic topography and drainages.

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