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Showing 1 to 20 of 23 for “"Cascadia subduction zone"”.
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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
Subduction zones are areas of tectonic plate collision that produce associated earthquakes and destructive tsunamis and, in addition, provide a link between the atmosphere and ocean. Mapping the thermal and fluid circulation of an active subduction zone can advance our understanding of subduction …
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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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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
<p>Seismic hazards poised to cities by subduction zones are strongly controlled by fault slip along the deeper extent of the two plate 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 …
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Diatom-based reconstructions of earthquake-induced paleoenvironmental change in coastal Alaska and Washington, USA
… historical (written and oral) records along most subduction zone coastlines often leading to the underestimation of magnitude, recurrence, and spatial extent of these events. Paleoseismic studies target low energy depositional environments that record primary and secondary evidence of earthquake …
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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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HYDROGEOLOGIC PROPERTY ESTIMATION IN PLATE BOUNDARY OBSERVATORY BOREHOLES USING TIDAL RESPONSE ANALYSIS
… (PBO) network along the San Andreas fault and Cascadia subduction zone. Permeability and hydraulic diffusivity determinations range from 6.4_10-16 – 8.4_10-14 m2 and 1_10-4 – 9_10-1 m2s-1, respectively, whereas specific storage values are ~1_10-6 m-1. Values are generally consistent through …
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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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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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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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Utilizing Changes in Repeating Earthquakes to Monitor Evolving Processes and Structure Before and During Volcanic Eruptions
… from fault systems (such as the San Andreas and Cascadia subduction zone), to hydrothermal areas and volcanoes. Volcano seismologists are particularly concerned with repeating earthquakes, as they have been observed at volcanoes along the entire range of eruptive style and are often a prominent …
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Performance-based earthquake engineering with the first-order reliability method
… wall building due to the seismic hazard in the Cascadia subduction zone. A 3-dimensional finite-element model of the structure with nonlinear material models is subjected to stochastic ground motions in the reliability analysis. The parameters for the stochastic ground motion model are developed …
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Fluid Budget of Metasedimentary Rocks from a Tertiary Accretionary Prism and Connections to Seismicity, Olympic Peninsula, Northwest Washington State
… tremor and slip (ETS) earthquake events along subduction zones, but prior studies lack the detail to effectively test the hypothesis that fluid flow triggers ETS events. I conducted field work along a 52.5 km transect on the Olympic Peninsula metasedimentary accretionary prism of the Cascadia …
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Transient signal detection using GPS position time series
… and in the Washington State section of the Cascadia subduction zone. We have detected a transient signal whose maximum displacement is -9 mm in the horizontal and -41 mm in the vertical at Akutan volcano, Alaska, during the first half of 2008 and two previously unrecognized small slow slip …
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From Fault Dynamics to Seismic Hazard Assessment
… 2, we applied the same methodology to the Cascadia subduction zone, known to have produced a M~9 earthquake in 1700 but where the seismic hazard remains poorly constrained. As part of this study we determined a model of interseismic coupling and of fault slip due to Slow Slip Events using …
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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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INTEGRATING GEOPHYSICAL METHODS TO STUDY SUBDUCTION ZONE PROPERTIES, ACTIVE FAULTING IN A VOLCANIC FIELD, AND VOLCANO LANDSLIDE HAZARDS
… data to study the upper crustal structure of subduction zones and its influence on earthquake, volcanic, and landslide hazards from the trench to the volcanic arc. Specifically, I use seismic reflection data, earthquake focal mechanisms, magnetics, and electromagnetics to study three actively …
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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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