Earthquake recordings from the 2002 Seattle Seismic Hazard Investigation of Puget Sound (SHIPS), Washington state

Pratt, Thomas L.; Meagher, K.L.; Brocher, Thomas M.; Yelin, Thomas S.; Norris, Robert M.; Hultgrien, L.; Barnett, Elizabeth A.; Weaver, Craig S.

doi:10.3133/ofr03361

Cited by 5 publications

(3 citation statements)

References 9 publications

(13 reference statements)

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“…In 2002, the Seattle Seismic Hazard Investigation of the Puget Sound (SHIPS02) deployed 85 seismometers that included a linear transect across the Puget Lowland (Pratt, Meagher, et al, 2003). In 2002, the Seattle Seismic Hazard Investigation of the Puget Sound (SHIPS02) deployed 85 seismometers that included a linear transect across the Puget Lowland (Pratt, Meagher, et al, 2003).…”

Section: Model Validation and Basin Amplification From Deep Earthquakesmentioning

confidence: 99%

“…There are limited observations with which we can test our modeling of these long‐period amplifications. In 2002, the Seattle Seismic Hazard Investigation of the Puget Sound (SHIPS02) deployed 85 seismometers that included a linear transect across the Puget Lowland (Pratt, Meagher, et al, ). The seismometers recorded five teleseismic earthquakes, from which amplifications can be computed based on horizontal component recordings of shear waves with near‐vertical incidence, normalized to bedrock sites at the east and west sides of the basin (see the supporting information).…”

Section: Basin Amplification From 3‐d Simulationsmentioning

confidence: 99%

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Source‐Dependent Amplification of Earthquake Ground Motions in Deep Sedimentary Basins

Wirth

Vidale

Frankel

et al. 2019

Geophysical Research Letters

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Deep sedimentary basins amplify long‐period shaking from seismic waves, increasing the seismic hazard for cities sited on such basins. We perform 3‐D simulations of point source earthquakes distributed around the Seattle and Tacoma basins in Washington State to examine the dependence of basin amplification on source azimuth, depth, and earthquake type. For periods between 1 and 10 s, the pattern of amplification is spatially heterogeneous and differs considerably with the source‐to‐site azimuth. For close‐in earthquakes, the greatest basin amplification occurs toward the farside of the basin and ground motions from crustal earthquakes experience greater amplification than those from more vertically incident, deeper intraplate earthquakes. Love and Rayleigh waves form similar spatial patterns for a given source location, although the magnitude of amplification varies. The source dependence of basin amplification is an important factor for seismic hazard assessment, in both the Seattle and Tacoma basins, and by extension for deep sedimentary basins worldwide.

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Section: Model Validation and Basin Amplification From Deep Earthquakesmentioning

confidence: 99%

Section: Basin Amplification From 3‐d Simulationsmentioning

confidence: 99%

Source‐Dependent Amplification of Earthquake Ground Motions in Deep Sedimentary Basins

Wirth

Vidale

Frankel

et al. 2019

Geophysical Research Letters

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“…Most of our data came from the Seattle SHIPS array (Pratt, Meagher, et al, 2003), with some additional data from stations around Seattle from the Pacific Northwest Seismic Network (PNSN) and Earthscope's Transportable Array (TA; see Fig. 3).…”

Section: Datamentioning

confidence: 99%

Basin Shear-Wave Velocities beneath Seattle, Washington, from Noise-Correlation Rayleigh Waves

Delorey¹,

Vidale²

2011

Bulletin of the Seismological Society of America

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Tomography with short-period Rayleigh waves, extracted using noise interferometry, can refine S-wave velocity (V S) models in urban areas with dense arrays of short-period and broadband instruments. We apply this technique to the Seattle area to develop a new shallow V S model for use in seismic-hazard assessment. Continuous data from the Seismic Hazards in Puget Sound (SHIPS) array and local broadband stations have interstation distances of 90 km or less. This spacing allows us to extract Rayleigh waves with periods between 2 and 10 s that are sensitive to shallow-basin structure. This new V S model for the Seattle basin is constructed using direct observations rather than using P-wave velocity (V P) observations and a V P =V S ratio as all previous 3D models at this scale have been constructed. Our results reveal greater detail in the upper 3.5 km than previous models. Earthquake simulations calculated using our new model better predict peak ground velocities (PGV) at periods between 1 and 2 s for two local earthquakes than the previous model used to calculate Seattle's seismic-hazard map (Frankel et al., 2007). We collected data from two local earthquakes and ran finite-difference simulations using our new velocity model as well as the previous velocity model used in development of the Seattle seismic-hazard maps to assess how well our model predicts ground motions relative to the previous model. With a recent deployment of Netquakes strong-motion stations by the Pacific Northwest Seismic Network (PNSN) and the U.S. Geological Survey, we are now able to make more comprehensive assessments of the predictions for recent events.

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Seismic Amplification within the Seattle Basin, Washington State: Insights from SHIPS Seismic Tomography Experiments

Snelson

Brocher

Miller

et al. 2007

Bulletin of the Seismological Society of America

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Earthquake recordings from the 2002 Seattle Seismic Hazard Investigation of Puget Sound (SHIPS), Washington state

Cited by 5 publications

References 9 publications

Source‐Dependent Amplification of Earthquake Ground Motions in Deep Sedimentary Basins

Source‐Dependent Amplification of Earthquake Ground Motions in Deep Sedimentary Basins

Basin Shear-Wave Velocities beneath Seattle, Washington, from Noise-Correlation Rayleigh Waves

Seismic Amplification within the Seattle Basin, Washington State: Insights from SHIPS Seismic Tomography Experiments

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