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Shallow Faulting and Folding beneath South‐Central Seattle, Washington State, from Land‐Based High‐Resolution Seismic‐Reflection Imaging
Comparing subduction ground-motion models to observations for Cascadia
The 2023 US National Seismic Hazard Model: Subduction ground-motion models
Recent Expansion of the Cascades Volcano Observatory Geophysical Network at Mount Rainier for Improved Volcano and Lahar Monitoring
Assessing the Expansion of Ground‐Motion Sensing Capability in Smart Cities via Internet Fiber‐Optic Infrastructure
Implications of input ground-motion selection techniques on site response analyses for different tectonic settings
The 2023 US National Seismic Hazard Model: Ground-motion characterization for the conterminous United States
Evidence of Seattle Fault Earthquakes from Patterns in Deep‐Seated Landslides
Select liquefaction case histories from the 2001 Nisqually, Washington, earthquake: A digital data set and assessment of model performance
A latent Gaussian process model for the spatial distribution of liquefaction manifestation
High‐Resolution Marine Seismic Imaging of the Seattle Fault Zone: Near‐Surface Insights into Fault Zone Geometry, Quaternary Deformation, and Long‐Term Evolution
A Century of Landslides in Seattle, Washington: Coalescing and Digitizing the City's Historic Landslide Inventories
Influence of ground motion duration on the dynamic deformation capacity of reinforced concrete frame structures
Structure and Q P – Q S Relations in the Seattle and Tualatin Basins from Converted Seismic Phases
The 2018 update of the US National Seismic Hazard Model: Additional period and site class data
The 2018 update of the US National Seismic Hazard Model: Overview of model and implications
Broadband Synthetic Seismograms for Magnitude 9 Earthquakes on the Cascadia Megathrust Based on 3D Simulations and Stochastic Synthetics, Part 1: Methodology and Overall Results
Performance-Based Probabilistic Seismic Slope Displacement Procedure
Good News and Bad News in Two Highly Industrialized Puget Sound, Washington (u.s.a.) Embayments
Geology of Seattle, a field trip
ABSTRACT Seattle’s geologic record begins with Eocene deposition of fluvial arkosic sandstone and associated volcanic rocks of the Puget Group, perhaps during a time of regional strike-slip faulting, followed by late Eocene and Oligocene marine deposition of the Blakeley Formation in the Cascadia forearc. Older Quaternary deposits are locally exposed. Most of the city is underlain by up to 100 m of glacial drift deposited during the Vashon stade of Fraser glaciation, 18–15 cal k.y. B.P. Vashon Drift includes lacustrine clay and silt of the Lawton Clay, lacustrine and fluvial sand of the Esperance Sand, and concrete-like Vashon till. Mappable till is absent over much of the area of the Vashon Drift. Peak local ice thickness was 900 m. Isostatic response to this brief ice loading was significant. Upon deglaciation, global ice-equivalent sea level was about −100 m and local RSL (relative sea level) was 15–20 m, suggesting a total isostatic depression of ~115–120 m at Seattle. Subsequent rapid rebound outstripped global sea-level rise to result in a newly recognized marine low-stand shoreline at −50 m. The Seattle fault is a north-verging thrust or reverse fault with ~7.5 km of throw. Conglomeratic Miocene strata may record initiation of shortening. Field relations indicate that fault geometry has evolved through three phases. At present, the north-verging master fault is blind, whereas several surface-rupturing faults above the master fault are south verging. The 900–930 A.D. Restoration Point earthquake raised a 5 km × 35 km (or larger) area as much as 7 m. The marine low-stand shoreline is offset by a similar amount, thus there has been only one such earthquake in the last ~11 k.y. Geomorphology is largely glacial: an outwash plain decorated with ice-molded flutes and large, anastomosing tunnel valleys carved by water flowing beneath the ice sheet. Euro-Americans initially settled here because of landscape features formed by uplift in the Restoration Point earthquake. But steep slopes and tide flats were not conducive to commerce: starting in the 1890s and ending in the 1920s, extensive regrading removed hills, decreased slopes, and filled low areas. In steep slopes the glacial stratigraphy is prone to landslides when saturated by unusually wet winters. Seismic hazards comprise moderately large (M 7) earthquakes in the Benioff zone 50 km and more beneath the city, demi-millennial M 9 events on the subduction zone to the west, and infrequent local crustal earthquakes (M 7) that are likely to be devastating because of their proximity. Seismic shaking and consequent liquefaction are of particular concern in Pioneer Square, SoDo, and lower Duwamish neighborhoods, which are largely built on unengineered fill that was placed over estuarine mud. Debris from past Mount Rainier lahars has reached the lower Duwamish valley and a future large lahar could pose a sedimentation hazard.