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Browsing Geology by Title
Now showing items 1-14 of 14
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Active tectonics in the central Tien Shan, Kyrgyz Republic
(2001)Fault slip rates show that late Quaternary contraction is distributed across the Kyrgyz central Tien Shan, and not concentrated at its margins. Nearly every intermontane basin contains Neogene and Quaternary syntectonic ... -
Anisotropic lattice thermal diffusivity in olivines and pyroxenes to high temperatures
(2002)The anisotropic lattice thermal diffusivity of three olivines (Fo 0, Fo78, and Fo91), one orthopyroxene (En 91), and one clinopyroxene (Di72He9Jd3Cr 3Ts12) have been measured via impulsive stimulated light scattering, ... -
Debris flow fans: process and form
(1994)Lithologic, climatic, and tectonic influences on debris-flow-dominated alluvial fan (debris-flow fan) morphology are elucidated through a combination of field mapping, map and aerial photo analysis, and a theoretical ... -
Depositional environments, basin evolution and tectonic significance of the Eocene Chumstick Formation, Cascade Range, Washington
(1988)The Chumstick Formation represents a Paleogene, humid-tropical, alluvial-fan system which filled a wrench-fault basin in Washington State. Chumstick deposition was characterized by stream-flow processes; low ($$1 m/k.y.) ... -
Experimental studies of deposition by debris flows: process, characteristics of deposits, and effects of pore-fluid pressure
(1996)This study examines deposition by experimental debris flows (to 15 m$\sp3$) composed of mixtures of gravel (to 32 mm), sand, and loam using the 95-m-long, 2-m-wide, 31$\sp\circ$ U.S. Geological Survey debris-flow flume. ... -
Fluvial recovery following basin-wide sediment loading at Mount Pinatubo, Philippines
(2005)The June 1991 eruption of Mount Pinatubo, Philippines, was the second largest of the 20th century, emplacing 5--6 km 3 of pyroclastic-flow material and creating record high sediment yields on rivers draining the volcano. ... -
Glacier dynamics and the development of glacial landforms in the eastern Puget lowland, Washington
(1984)In the Late Pleistocene, the Puget lobe of the Cordilleran ice sheet covered the Puget lowland in western Washington to an average depth of 1000 m in the Skykomish-Snoqualmie region and abutted against the western front ... -
Influence of mass wasting on bed-surface armoring, lag formation, and sediment storage in mountain drainage basins of western Washington State
(2006)This dissertation uses field studies and analyses of digital topography in western Washington State to investigate (1) hydraulic controls on the spatial variation in bedsurface armoring, (2) grain-size controls on the ... -
Late Holocene climate change and calving glacier fluctuations along the southwestern margin of the Stikine Icefield, Alaska
(2001)The retreat of large tidewater- and lake-calving glaciers, as well as nearby land-based glaciers, in southeastern Alaska during the middle to late Holocene was primarily triggered by increases in summer temperature. Shakes, ... -
Nature and origin of variations in late-glacial and Holocene atmospheric 14C as revealed by global carbon cycle modeling
(1990)Simulations with a global box-diffusion $\sp$C model indicate that the millennium- and century-scale atmospheric $\Delta\sp$C variations during the Holocene are more likely explained by fluctuations in $\sp$C production ... -
Petrology and structure of the pre-Tertiary rocks of Lummi and Eliza Islands, Washington
(1980)Exposed on Lummi Island are two groups of pre-Tertiary rocks everywhere in fault contact with each other: a 1300 meter thick section of turbidite sandstone and mudstone, and rocks largely of igneous affinity. The latter ... -
The role of oceanic lithosphere in inter- and intra-volcano geochemical heterogeneity at Maui Nui, Hawaii
(2004)The volcanoes of Maui Nui (West Molokai, East Molokai, Lanai, West Maui, Haleakala and Kahoolawe) record Hawaiian magmatism at ∼1--2 Ma. These volcanoes nearly span the compositional range erupted from all the Hawaiian ... -
The use of streambed texture to interpret physical and biological conditions at watershed, reach, and subreach scales
(1998)Physical controls on bed-surface grain size and consequent implications for aquatic habitat are examined at a variety of spatial scales. Data compiled from laboratory studies show that reach-average median surface grain ...