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Geology

Theses/Dissertations

2016

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Articles 271 - 273 of 273

Full-Text Articles in Physical Sciences and Mathematics

Mechanisms Of Inverted Seismic Multiplets, Joel Brann Jan 2016

Mechanisms Of Inverted Seismic Multiplets, Joel Brann

WWU Graduate School Collection

In seismology, multiplets are a series of earthquakes with similar waveforms that are thought to represent a repeating process occurring at the same location. A few studies have previously identified multiplets with waveforms that are inverted relative to one another; here termed inverted multiplets (IMs).For this study, several data sets were searched for additional examples of IMs, including earthquake swarms associated with a volcanic eruption (Mt. Spurr), a dike intrusion (Nechako Basin), dome building (Mt. St. Helens), and times of no volcanic or magmatic activity (Piton de la Fournaise [PDLF], Mt. Spurr). Source mechanisms are determined to describe what could …

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Fluvial Incision, Upper Plate Faulting, And Short-Term Deformation In The Southern Olympic Mountains Of Washington State, Jaime Delano Jan 2016

Fluvial Incision, Upper Plate Faulting, And Short-Term Deformation In The Southern Olympic Mountains Of Washington State, Jaime Delano

WWU Graduate School Collection

Understanding topographic development in subduction zone forearcs requires comparison of deformation at short and long-term time intervals. We focus here on geomorphic records of uplift and incision in the Cascadia forearc of Washington State for comparison with short-term deformation driven by subduction zone coupling. We use surficial geologic mapping, optically stimulated luminescence dating, and surveyed terrace strath elevations to document fluvial incision and fault slip rates in the Wynoochee River valley in the southern Olympic Mountains. Results from 14 optically stimulated luminescence samples yield fluvial terrace age groupings of ~7-12 ka, ~14-18 ka, ~30-45 ka, and ~50-60 ka, which likely …

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Emergent Wetland Plant Biophysical Characteristics Associated With Wave Attenuation And Sediment Retention, Chad D. Stellern Jan 2016

Emergent Wetland Plant Biophysical Characteristics Associated With Wave Attenuation And Sediment Retention, Chad D. Stellern

WWU Graduate School Collection

Estuarine wetlands have proven a cost-effective buffer against coastal hazards because they reduce erosive wave energy and enable sediment retention by producing hydraulic friction. Human modifications to coastal hydrology and sediment transport have resulted in loss of wetlands and associated protection. Our study area, the Stillaguamish Delta has experienced a 55% loss in wetlands and significant marsh retreat (Grossman and Curran (in review)). We quantified vegetation characteristics (spatial, vertical and, seasonal) that effect wave attenuation using image analysis, remote sensing and, in-situ measurements. We produced a sediment budget for the northern region and evaluate suspended sediment dynamics. Our elasticity and …

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