Browsing Earth and Space Sciences by Title
Now showing items 63-82 of 120
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On Star-Planet Interaction: Magnetospheric Dynamics and Atmospheric Evolution
With the explosion of exoplanetary discoveries, the question of planetary habitability is at the forefront, and generates many interesting and complex questions. One of those questions: Are planetary global magnetic fields ... -
On the kinematic and dynamic evolution of a magma mush: from liquidus to solidus
Magmas are dynamic hydrogranular systems where the interactions between the melt and the residing crystals influences the eruptive behavior of volcanoes, the concentration of economic metals, and the stratification of the ... -
On the origin of Umtanum Ridge: kinematics of Neogene slip
(2014-04-30)Constraining the geometry of active faults is an important step in determining accurate estimates of regional seismic hazard. Where subsurface data are lacking, the shape of hanging wall folds can be used to interpret fault ... -
The Paleocene Eocene Thermal Maximum in the Hanna Basin, WY: Constraints from Organic Carbon Isotopes and Palynological Data
(2014-02-24)The P-E boundary, approximately 56 Ma, coincides with a global climatic event, the Paleocene-Eocene Thermal Maximum (PETM). The PETM is believed to have resulted from a 2-8 fold increase in atmospheric pCO2 in less than ... -
The persistence of rapid exhumation in the eastern Himalayan syntaxis
At the eastern margin of the Indian-Eurasian plate collision, margin-normal plate convergence transitions to dextral strike-slip motion, warping tectonic units southward to form the eastern Himalayan syntaxis. Large southeast ... -
The persistence of rapid exhumation in the eastern Himalayan syntaxis
At the eastern margin of the Indian-Eurasian plate collision, margin-normal plate convergence transitions to dextral strike-slip motion, warping tectonic units southward to form the eastern Himalayan syntaxis. Large southeast ... -
Physical Abrasion of Mafic Minerals and Basalt Grains: Application to Martian Aeolian Deposits
Sediment maturity, or the mineralogical and physical characterization of sediment deposits, has been used to locate of sediment source, transport medium and distance, weathering processes, and paleoenvironments on Earth. ... -
Physical Abrasion of Mafic Minerals and Basalt Grains: Application to Martian Aeolian Deposits
Sediment maturity, or the mineralogical and physical characterization of sediment deposits, has been used to locate of sediment source, transport medium and distance, weathering processes, and paleoenvironments on Earth. ... -
Planetary Penetrators for Sample Return Missions
University of Washington Abstract Planetary Penetrators for Sample Return Missions Chad A. Truitt Chair of the Supervisory Committee: Professor Robert M. Winglee Earth and Space Sciences Sample return missions offer a ... -
The Plasma Physics Processes that Drive Ring Current Enhancements during Geomagnetic Storms and Substorms
(2012-09-13)Geomagnetic storms result when energetic particles of solar and ionospheric origin fill Earth's inner magnetosphere and create a strong westward current, known as the ring current. This dissertation presents results from ... -
Pyroxene Chemistry in Polymict Eucrite Northwest Africa 6475: Contrasts with Juvinas, Stannern and Igdi, and Evaluation of Models for Eucrite Magmatic Evolution
(2013-02-25)The eucrite meteorite suite is the mafic component of a silicate profile that formed from a magma ocean on a minor body, potentially the asteroid Vesta. There are four chemical divisions of eucrites: cumulate (CE), main ... -
Quantifying changes in climate and surface elevation of polar ice sheets during the last glacial-interglacial transition
This dissertation describes three research projects investigating changes in polar climate and the ice sheets during the last deglaciation. The first project, Chapter 2, reconstructs the past 20,000 years of Greenland ... -
Quantifying ice-shelf basal melt and ice-stream dynamics using high-resolution DEM and GPS time series
This dissertation describes methods to generate high-resolution digital elevation models (DEMs) of the Earth's ice sheets, and combines these observations with in situ GPS measurements to study basal melting beneath the ... -
Quaternary glaciation in Central Asia
The mountain ranges in Central Asia were heavily glaciated during the Quaternary Period. The relative magnitudes of paleoglaciers varied spatially and temporally. The chronology of glacial standstills was established from ... -
Quaternary grounding-line fluctuations in Antarctica
The West Antarctic Ice Sheet may be prone to rapid collapse under climates warmer than today due to a dynamic instability at the grounding line, where the ice sheet goes afloat over seawater. However, there is to-date no ... -
Re-Evaluating the Late Devonian Mass Extinction: A Geochemical Investigation of the Relationship between Carbon Isotope Fluctuations, Faunal Turnover, and Paleoenvironmental Change Recorded in Upper Devonian Carbonates of the Lennard Shelf, Western Australia
The primary goal of this dissertation is to increase understanding of the so-called Late Devonian mass extinction through the use of stable isotope geochemistry. Despite decades of research, the timing, cause(s), and extent ... -
Relationships between climate and geophysical processes: what climate histories can be inferred from glaciers, lakes, and ice streams?
This dissertation aims to characterize the present and future variability of the Earth's climate by putting it in the context of past variations in climate. Herein I explore how the spatial and temporal fluctuations of ... -
Seismic Structure and Crustal Accretion Along an Intermediate-rate Mid-Ocean Ridge Segment
(2013-11-14)Epicenters and magnitudes for 36,523 earthquakes recorded along the Endeavour segment between August 2003 and October 2006 are automatically determined using a local ocean-bottom seismometer (OBS) network. The catalog is ... -
Seismic Study of Tremor, Deep Long-Period Earthquakes, and Basin Amplification of Ground Motion
In this thesis, we use seismic data and seismological tools to investigate three topics, (1) triggering between slow slip (tremor as proxy) and nearby small earthquakes, (2) mechanisms of deep-long period earthquakes beneath ... -
Sensing impacts to the Earth-ionosphere waveguide from terrestrial and space weather
The Earth's lower ionosphere forms the lower-altitude limit of space plasma near the Earth, coexisting with the neutral mesosphere-lower thermosphere at 60-150 km altitude. In-situ measurements of this region are made ...