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Showing 1 to 20 of 37 for “"Cascadia"”.
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Slip Estimation from Real-Time GPS in Cascadia
Current systems for rapidly characterizing earthquakes are based on seismic, teleseismic, and Deep-ocean Assessment and Reporting of Tsunami (DART) buoy data. These systems have significant limitations that hinder them from making rapid and accurate assessments of large earthquakes used for local …
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Geotechnical characterization of sediments from Hydrate Ridge, Cascadia Continental Margin
… were obtained from ODP Site 1244, Hydrate Ridge, Cascadia Continental Margin with the goal of understanding the stress history, consolidation behavior and strength characteristics of the soil. A series of Constant Rate of Strain Consolidation (CRSC) and Ko- Consolidated Undrained triaxial (CKoU) …
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Seismic Constraints on Slow Slip Events within the Cascadia Subduction Zone
… of geodetic GPS time series from the Cascadia subduction zone have revealed at least 30 resolvable slow slip events along the megathrust, ranging from northern California to southern British Columbia, since 1997. Many of the smaller and more recent events are barely resolvable with …
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Impact of Cascadia Subduction Zone Earthquakes on Coastal Bridges in Washington State
The Cascadia Subduction Zone in the Pacific Northwest means is likely to generate a magnitude 9 earthquake in the future. A set of 30 synthetic (physics-based) ground motions were created by researchers from the University of Washington and United States Geological Survey. Using an existing …
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The Thermal and Fluid Environment of the Cascadia Subduction Zone, Southern Washington State
… map the thermal and fluid environment within the Cascadia Subduction zone offshore Southern Washington State. Eleven recently collected multi-channel seismic (MCS) profiles from the 2012 Cascadia Open-Access Seismic Transect (COAST) experiment offshore Washington State were used to characterize …
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Quantifying coseismic land-level change along the Cascadia subduction zone in central Oregon
Understanding the behavior of past Cascadia Subduction Zone (CSZ) megathrust earthquakes is crucial for assessing rupture dynamics and predicting future seismic hazards. Estimates of the magnitude of coseismic subsidence produced by these great (>M 8.5) earthquakes provide critical constraints for …
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The CAFE Experiment : a joint seismic and MT investigation of the Cascadia Subduction System
… and magnetotelluric stations located in the Cascadia subduction zone region of central Washington. In the migrated seismic section, we clearly image the top of the slab and oceanic Moho, as well as a velocity increase corresponding to the eclogitization of the hydrated upper crust. A deeper …
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New slip and stress distributions hold implications for the next great earthquake in Cascadia
… on the deep portion of the subduction interface. Cascadia is recognized for having a uniquely strong correlation of tremor and slow slip known as episodic tremor and slip (ETS) that occurs roughly every 14 - 16 months and propagates along strike at kilometers per day. While ETS reduces shear …
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The CAFE experiment : a joint seismic and MT investigation of the Cascadia subduction system
… and magnetotelluric stations located in the Cascadia subduction zone region of central Washington. In the migrated seismic section, we clearly image the top of the slab and oceanic Moho, as well as a velocity increase corresponding to the eclogitization of the hydrated upper crust. A deeper …
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Decoding Seismic Hazard Enigmas via Next-Generation Paleoseismic Analyses: With Application to the Cascadia Subduction Zone and Beyond
… a community database and liquefaction in an Mw9 Cascadia Subduction Zone (CSZ) event is forecasted regionally using 30 different physics-based ground motion realizations and a first-order geospatial liquefaction model. These products are (6) made available as an online database so that others may …
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Energy Budget Analysis of Slow-Slip Tremor Events Along the Cascadia Subduction Zone Using Continuous GPS Array Data
… interaction closest to population densities. In Cascadia, where Mw=9 size events are known to occur from a variety of sources, modeling of leveling data has suggested that the region of maximum slip lies well offshore and diminishes rapidly inland. However, over two dozen slow slip distributions …
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Modeling Liquefaction-Induced Road Disruptions in Cascadia Megathrust Earthquakes: Implications for Emergency Response and Access in the U.S. Pacific Northwest
Large earthquakes along the Cascadia Subduction Zone (CSZ) are expected to trigger widespread soil liquefaction that could severely disrupt transportation systems across the U.S. Pacific Northwest. However, past regional assessments have relied on simple geologic screening methods and binomial …
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Transient Detection and Modeling of Continuous Geodetic Data
… two studies of transient deformation along the Cascadia plate margin and a discussion of the methodologies employed in these studies. We model one 7-week episode of transient deformation that occurred during 2003 beneath the Puget Sound area. Additionally, we utilize a combination of continuous …
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Refining tsunami inundation limits for the 1700 CE Cascadia earthquake: detailed mapping of fine-grained deposits and diatom biostratigraphy at the Salmon River estuary, central Oregon
… provide tangible evidence of the 1700 CE Cascadia Subduction Zone (CSZ) earthquake and tsunami. Such evidence has been used to evaluate earthquake source models by comparing simulated tsunami inundation or sediment deposition to the mapped extent of sandy tsunami deposits. However, …
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Mapping and Modeling the Seattle Fault Tsunami Inundation in Puget Sound
… Lowlands, or earthquakes originating on the Cascadia subduction zone. This study investigated two coastal marshes in Puget Sound, Deer Lagoon and Doe-Kag-Wats, for evidence of a paleotsunami record to combine with tsunami modeling, in order to predict how future events could inundate Puget …
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Tsunami Excitation Estimation from Real-time GNSS
… estimation algorithm, implemented for the Cascadia subduction zone, that uses continuous GNSS position streams to estimate finite faulting. The system is based on a time-domain convolution of fault slip that uses a pre-computed catalog of hydrodynamic Green’s functions generated with the …
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Diatom-based reconstructions of earthquake-induced paleoenvironmental change in coastal Alaska and Washington, USA
… zones: Alaska-Aleutian subduction zone and the Cascadia subduction zone. In these chapters we use diatoms to explore 1) the potential for combined slip along the Patton Bay splay fault system and the eastern Alaska-Aleutian subduction zone within Prince William Sound, Alaska, and 2) lacustrine …
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Dynamic links between short-term deformation and long-term tectonics: a finite element study
… strain that leads to mountain building. In Cascadia, I showed that the critical condition for producing permanent crustal shortening, hence mountain building, is for the plastic yield strength of the plate interface to be higher than that of the overriding plate. Strong trench coupling and a …
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Contributions to the Neotectonics of the central and northern Walker Lane
… Nevada with the overriding crust of the southern Cascadia Subduction Zone. Accommodation of this strain remains geologically unaccounted for, thus it is unknown how the contraction is accommodated. The purpose of this dissertation is to place new and more robust constraints on the rates of slip …
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Tectonics of the Georgia Basin, northwest Washington State, USA, and southwest British Columbia, Canada
… indicate long term north-south shortening of the Cascadia forearc extends north of recognized active faults. This study reviews seismic reflection profiles from the SHIPS 1998 and 2002 experiments in conjunction with industry data to identify active geologic structures capable of accommodating …
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