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• 1. [Article] A 2-D Magnetotelluric Investigation of the Cascadia Subduction Zone

  39 pages. A thesis presented to the Department of Physics and the Clark Honors College of the University of Oregon in partial fulfillment of the requirements for degree of Bachelor of Science, Spring 2...

  Citation × Citation Citation Abstract Copy Title: A 2-D Magnetotelluric Investigation of the Cascadia Subduction Zone Author: Wogan, Nicholas Year: 2016 39 pages. A thesis presented to the Department of Physics and the Clark Honors College of the University of Oregon in partial fulfillment of the requirements for degree of Bachelor of Science, Spring 2016. Title: A 2-D Magnetotelluric Investigation of the Cascadia Subduction Zone Author: Wogan, Nicholas Year: 2016 39 pages. A thesis presented to the Department of Physics and the Clark Honors College of the University of Oregon in partial fulfillment of the requirements for degree of Bachelor of Science, Spring 2016. Close

• 2. [Article] Variation in Seismic-Wave Attenuation Along the Cascadia Subduction Zone Determined from Tectonic Tremor

  Single page poster

  Citation × Citation Citation Abstract Copy Title: Variation in Seismic-Wave Attenuation Along the Cascadia Subduction Zone Determined from Tectonic Tremor Author: Littel, Geena, Baltay, Annemarie Year: 2017 Single page poster Title: Variation in Seismic-Wave Attenuation Along the Cascadia Subduction Zone Determined from Tectonic Tremor Author: Littel, Geena, Baltay, Annemarie Year: 2017 Single page poster Close

• 3. [Article] A Magnetotelluric Investigation of the Cascadia Subduction Zone Plate Interface

  49 pages. A thesis presented to the Department of Physics and the Clark Honors College of the University of Oregon in partial fulfillment of the requirements for degree of Bachelor of Science, Spring 2...

  Citation × Citation Citation Abstract Copy Title: A Magnetotelluric Investigation of the Cascadia Subduction Zone Plate Interface Author: Skidmore, Michael John-Barnett Year: 2017 49 pages. A thesis presented to the Department of Physics and the Clark Honors College of the University of Oregon in partial fulfillment of the requirements for degree of Bachelor of Science, Spring 2017 Title: A Magnetotelluric Investigation of the Cascadia Subduction Zone Plate Interface Author: Skidmore, Michael John-Barnett Year: 2017 49 pages. A thesis presented to the Department of Physics and the Clark Honors College of the University of Oregon in partial fulfillment of the requirements for degree of Bachelor of Science, Spring 2017 Close

• 4. [Article] Debris Flow Network Morphology and a New Erosion Rate Proxy for Steepland Basins with Application to the Oregon Coast Range and Cascadia Subduction Zone

  Reaches dominated by debris flow scour and incision tend to greatly influence landscape form in steepland basins. Debris flow networks, despite their ubiquity, have not been exploited to develop erosion ...

  Citation × Citation Citation Abstract Copy Title: Debris Flow Network Morphology and a New Erosion Rate Proxy for Steepland Basins with Application to the Oregon Coast Range and Cascadia Subduction Zone Author: Penserini, Brian Year: 2015 Reaches dominated by debris flow scour and incision tend to greatly influence landscape form in steepland basins. Debris flow networks, despite their ubiquity, have not been exploited to develop erosion rate proxies. To bridge this gap, I applied a proposed empirical function that describes the variation of valley slope with drainage area in fluvial and debris flow reaches of steepland channel networks in the Oregon Coast Range. I calibrated a relationship between profile concavity and erosion rate to map spatial patterns of long-term uplift rates assuming steady state. I also estimated the magnitude and inland extent of coseismic subsidence in my study area. My estimates agree with field measurements in the same area along the Cascadia margin, indicating that debris flow valley profiles can be used to make interpretations from spatial patterns of rock uplift that may better constrain physical models of crustal deformation. This thesis includes unpublished co-authored material. Title: Debris Flow Network Morphology and a New Erosion Rate Proxy for Steepland Basins with Application to the Oregon Coast Range and Cascadia Subduction Zone Author: Penserini, Brian Year: 2015 Reaches dominated by debris flow scour and incision tend to greatly influence landscape form in steepland basins. Debris flow networks, despite their ubiquity, have not been exploited to develop erosion rate proxies. To bridge this gap, I applied a proposed empirical function that describes the variation of valley slope with drainage area in fluvial and debris flow reaches of steepland channel networks in the Oregon Coast Range. I calibrated a relationship between profile concavity and erosion rate to map spatial patterns of long-term uplift rates assuming steady state. I also estimated the magnitude and inland extent of coseismic subsidence in my study area. My estimates agree with field measurements in the same area along the Cascadia margin, indicating that debris flow valley profiles can be used to make interpretations from spatial patterns of rock uplift that may better constrain physical models of crustal deformation. This thesis includes unpublished co-authored material. Close

• 5. [Article] Fluid Boundaries: The Social Construction and Memory of Future Catastrophic Environmental Risk in a Community on the Oregon Coast

  The Oregon coast is facing the dual perils of climate change and the catastrophic Cascadia subduction zone earthquake and tsunami, yet many communities remain unprepared. Using qualitative interviews with ...

  Citation × Citation Citation Abstract Copy Title: Fluid Boundaries: The Social Construction and Memory of Future Catastrophic Environmental Risk in a Community on the Oregon Coast Author: Shtob, Daniel Year: 2016 The Oregon coast is facing the dual perils of climate change and the catastrophic Cascadia subduction zone earthquake and tsunami, yet many communities remain unprepared. Using qualitative interviews with residents of Coos Bay, Oregon, this study traces how communities facing these perils socially construct their visions of change by “remembering the future” and how this future memory influences unsettlement that, in turn, can trigger revision of strategies of action to deal with environmental risk. Participants understood these risks through three interrelated themes: analogy to familiar circumstances such as regular winter flooding, narratives of isolation and self-reliance based in collective history, and visions of symbolic preparedness. Each of these themes drew the conversation away from the material reality of environmental catastrophe, reducing relative unsettlement. Since the way that communities collectively understand environmental risk may influence preparatory action, these observations can help to explain the disjunction between knowledge of risks and response. Title: Fluid Boundaries: The Social Construction and Memory of Future Catastrophic Environmental Risk in a Community on the Oregon Coast Author: Shtob, Daniel Year: 2016 The Oregon coast is facing the dual perils of climate change and the catastrophic Cascadia subduction zone earthquake and tsunami, yet many communities remain unprepared. Using qualitative interviews with residents of Coos Bay, Oregon, this study traces how communities facing these perils socially construct their visions of change by “remembering the future” and how this future memory influences unsettlement that, in turn, can trigger revision of strategies of action to deal with environmental risk. Participants understood these risks through three interrelated themes: analogy to familiar circumstances such as regular winter flooding, narratives of isolation and self-reliance based in collective history, and visions of symbolic preparedness. Each of these themes drew the conversation away from the material reality of environmental catastrophe, reducing relative unsettlement. Since the way that communities collectively understand environmental risk may influence preparatory action, these observations can help to explain the disjunction between knowledge of risks and response. Close

• 6. [Article] Catastrophic Post-disaster Long-term Recovery Planning: A Capacity and Needs Assessment of the Oregon Coast

  Project committee: Andre Leduc, chair, Dr. Jean Stockard, Krista Dillon

  Citation × Citation Citation Abstract Copy Title: Catastrophic Post-disaster Long-term Recovery Planning: A Capacity and Needs Assessment of the Oregon Coast Author: Pearce, Jennifer E. Year: 2009, 2008 Project committee: Andre Leduc, chair, Dr. Jean Stockard, Krista Dillon Title: Catastrophic Post-disaster Long-term Recovery Planning: A Capacity and Needs Assessment of the Oregon Coast Author: Pearce, Jennifer E. Year: 2009, 2008 Project committee: Andre Leduc, chair, Dr. Jean Stockard, Krista Dillon Close

• 7. [Article] ETS in Tidal Records

  xiii, 75 p. : ill. (some col.)

  Citation × Citation Citation Abstract Copy Title: ETS in Tidal Records Author: Alba, Sequoia Kia Marie Year: 2012, 2011 xiii, 75 p. : ill. (some col.) Title: ETS in Tidal Records Author: Alba, Sequoia Kia Marie Year: 2012, 2011 xiii, 75 p. : ill. (some col.) Close

• 8. [Article] Woven Into the Community: Resilience and Tsunami Evacuation Route Configuration in Neskowin, Oregon

  89 pages. Examining committee chair: Chris Enright

  Citation × Citation Citation Abstract Copy Title: Woven Into the Community: Resilience and Tsunami Evacuation Route Configuration in Neskowin, Oregon Author: Davis, Bryn Year: 2017 89 pages. Examining committee chair: Chris Enright Title: Woven Into the Community: Resilience and Tsunami Evacuation Route Configuration in Neskowin, Oregon Author: Davis, Bryn Year: 2017 89 pages. Examining committee chair: Chris Enright Close

• 9. [Article] The seismic structures of the U.S. Pacific Northwest and the scaling and recurrence patterns of slow slip events

  xv, 136 p. : ill. (some col.)

  Citation × Citation Citation Abstract Copy Title: The seismic structures of the U.S. Pacific Northwest and the scaling and recurrence patterns of slow slip events Author: Gao, Haiying Year: 2011, 2013 xv, 136 p. : ill. (some col.) Title: The seismic structures of the U.S. Pacific Northwest and the scaling and recurrence patterns of slow slip events Author: Gao, Haiying Year: 2011, 2013 xv, 136 p. : ill. (some col.) Close

• 10. [Article] Modeling the Effects of Geologic Heterogeneity and Metamorphic Dehydration on Slow Slip and Shallow Deformation in Subduction Zones

  Slow slip and tectonic tremor in subduction zones take place at depths (~20 - 50 km) where there is abundant evidence for distributed shear over broad zones (~10 - 10^3 m) composed of rocks with marked ...

  Citation × Citation Citation Abstract Copy Title: Modeling the Effects of Geologic Heterogeneity and Metamorphic Dehydration on Slow Slip and Shallow Deformation in Subduction Zones Author: Skarbek, Robert Year: 2015 Slow slip and tectonic tremor in subduction zones take place at depths (~20 - 50 km) where there is abundant evidence for distributed shear over broad zones (~10 - 10^3 m) composed of rocks with marked differences in mechanical properties and for near lithostatic pore pressures along the plate interface where the main source of fluids must be attributed to chemical dehydration reactions. In Chapter II, I model quasi-dynamic rupture along faults composed of material mixtures characterized by different rate-and-state-dependent frictional properties to determine the parameter regime capable of producing slow slip in an idealized subduction zone setting. Keeping other parameters fixed, the relative proportions of velocity-weakening (VW) and velocity-strengthening (VS) materials control the sliding character (stable, slow, or dynamic) along the fault. The stability boundary between slow and dynamic is accurately described by linear analysis of a double spring-slider system with VW and VS blocks. In Chapter III, I model viscoelastic compaction of material subducting through the slow slip and tremor zone in the presence of pressure and temperature-dependent dehydration reactions. A dehydration fluid source is included using 1) a generalized basalt dehydration reaction in subducting oceanic crust or 2) a general nonlinear kinetic reaction rate law parameterized for an antigorite dehydration reaction. Pore pressures in excess of lithostatic values are a robust feature of simulations that employ parameters consistent with the geometry of the Cascadia subduction margin. Simulations that include viscous deformation uniformly generate traveling porosity waves that transport increased fluid pressures within the slow slip region. Slow slip and tremor also occur in shallow (< 10 km depth) accretionary prism sections of subduction zones. In Chapter IV, I examine how geologic heterogeneities affect the mechanics of accretionary prisms in subduction zones by showing how spatial variations in pore pressure, porosity, and internal friction coefficient affect predictions of basal shear stress, taper angle, and internal slip surface geometry. My results suggest that assuming average porosity throughout the prism may be a good approximation in many cases, but assuming an average value for the pore pressure can cause significant errors. This dissertation includes previously published and unpublished coauthored material. Title: Modeling the Effects of Geologic Heterogeneity and Metamorphic Dehydration on Slow Slip and Shallow Deformation in Subduction Zones Author: Skarbek, Robert Year: 2015 Slow slip and tectonic tremor in subduction zones take place at depths (~20 - 50 km) where there is abundant evidence for distributed shear over broad zones (~10 - 10^3 m) composed of rocks with marked differences in mechanical properties and for near lithostatic pore pressures along the plate interface where the main source of fluids must be attributed to chemical dehydration reactions. In Chapter II, I model quasi-dynamic rupture along faults composed of material mixtures characterized by different rate-and-state-dependent frictional properties to determine the parameter regime capable of producing slow slip in an idealized subduction zone setting. Keeping other parameters fixed, the relative proportions of velocity-weakening (VW) and velocity-strengthening (VS) materials control the sliding character (stable, slow, or dynamic) along the fault. The stability boundary between slow and dynamic is accurately described by linear analysis of a double spring-slider system with VW and VS blocks. In Chapter III, I model viscoelastic compaction of material subducting through the slow slip and tremor zone in the presence of pressure and temperature-dependent dehydration reactions. A dehydration fluid source is included using 1) a generalized basalt dehydration reaction in subducting oceanic crust or 2) a general nonlinear kinetic reaction rate law parameterized for an antigorite dehydration reaction. Pore pressures in excess of lithostatic values are a robust feature of simulations that employ parameters consistent with the geometry of the Cascadia subduction margin. Simulations that include viscous deformation uniformly generate traveling porosity waves that transport increased fluid pressures within the slow slip region. Slow slip and tremor also occur in shallow (< 10 km depth) accretionary prism sections of subduction zones. In Chapter IV, I examine how geologic heterogeneities affect the mechanics of accretionary prisms in subduction zones by showing how spatial variations in pore pressure, porosity, and internal friction coefficient affect predictions of basal shear stress, taper angle, and internal slip surface geometry. My results suggest that assuming average porosity throughout the prism may be a good approximation in many cases, but assuming an average value for the pore pressure can cause significant errors. This dissertation includes previously published and unpublished coauthored material. Close