Ian Stone
Ian Stone is an Earthquake Seismologist in the Earthquake Science Center.
Science and Products
High frequency and region-scale simulations of large (Mw7+) earthquakes on the southern Whidbey Island fault, Washington, USA High frequency and region-scale simulations of large (Mw7+) earthquakes on the southern Whidbey Island fault, Washington, USA
We simulate ground shaking in western Washington State from hypothetical Mw7.0–7.5 earthquakes on the southern Whidbey Island fault (SWIF). Ground motions are modeled considering kinematic source distributions on a complex fault plane, a 3D seismic velocity model, and region‐specific soil velocity models. We run simulations with varying model resolutions, including regional‐scale...
Authors
Ian P. Stone, Erin A. Wirth, Alex R. Grant, Arthur D. Frankel
Three-dimensional seismic velocity model for the Cascadia Subduction Zone with shallow soils and topography, version 1.7 Three-dimensional seismic velocity model for the Cascadia Subduction Zone with shallow soils and topography, version 1.7
The U.S. Geological Survey’s seismic velocity model for the Cascadia Subduction Zone provides P- and S-wave velocity (VP and VS, respectively) information from 40.2° to 50.0° N. latitude and −129.0° to −121.0° W. longitude, and is used to support a variety of research topics, including three-dimensional (3D) earthquake simulations and seismic hazard assessment in the Pacific Northwest...
Authors
Erin A. Wirth, Alex R. Grant, Ian P. Stone, William J. Stephenson, Arthur D. Frankel
Earthquake probabilities and hazards in the U.S. Pacific Northwest Earthquake probabilities and hazards in the U.S. Pacific Northwest
Earthquakes and their cascading consequences pose a significant threat to the people, environment, infrastructure, and economy of the U.S. Pacific Northwest. The Pacific Northwest is susceptible to three types of earthquakes: deep (intraslab) earthquakes, subduction zone (megathrust) earthquakes, and shallow crustal earthquakes. For each of these earthquake types, earth scientists can...
Authors
Erin A. Wirth, Arthur D. Frankel, Brian L. Sherrod, Alex R. Grant, Audrey Dunham, Ian P. Stone, Julia Grossman
A soil velocity model for improved ground motion simulations in the U. S. Pacific Northwest A soil velocity model for improved ground motion simulations in the U. S. Pacific Northwest
Near-surface seismic velocity structure may significantly impact the intensity, duration, and frequency content of ground shaking during an earthquake. In this study, we compile 649 shear wave velocity (Vs) profiles throughout the U.S. Pacific Northwest and southern British Columbia (PNW) and use these measured profiles to develop a representative soil velocity model for four major...
Authors
Alex R. Grant, Erin A. Wirth, Ian P. Stone
Evidence of Seattle Fault earthquakes from patterns of deep-seated landslides Evidence of Seattle Fault earthquakes from patterns of deep-seated landslides
Earthquake‐induced landslides can record information about the seismic shaking that generated them. In this study, we present new mapping, Light Detection and Ranging‐derived roughness dating, and analysis of over 1000 deep‐seated landslides from the Puget Lowlands of Washington, U.S.A., to probe the landscape for past Seattle fault earthquake information. With this new landslide...
Authors
Erich Herzig, Alison Duvall, Adam Booth, Ian P. Stone, Erin A. Wirth, Sean Richard LaHusen, Joseph Wartman, Alex R. Grant
3-D wave propagation simulations of Mw 6.5+ earthquakes on the Tacoma Fault, Washington state, considering the effects of topography, a geotechnical gradient, and a fault damage zone 3-D wave propagation simulations of Mw 6.5+ earthquakes on the Tacoma Fault, Washington state, considering the effects of topography, a geotechnical gradient, and a fault damage zone
We simulate shaking in Tacoma, Washington, and surrounding areas from Mw 6.5 and 7.0 earthquakes on the Tacoma fault. Ground motions are directly modeled up to 2.5 Hz using kinematic, finite‐fault sources; a 3D seismic velocity model considering regional geology; and a model mesh with 30 m sampling at the ground surface. In addition, we explore how adjustments to the seismic velocity...
Authors
Ian P. Stone, Erin A. Wirth, Alex R. Grant, Arthur D. Frankel
Topographic response to simulated Mw 6.5-7.0 earthquakes on the Seattle Fault Topographic response to simulated Mw 6.5-7.0 earthquakes on the Seattle Fault
We explore the response of ground motions to topography during large crustal fault earthquakes by simulating several magnitude 6.5–7.0 rupture scenarios on the Seattle fault, Washington State. Kinematic simulations are run using a 3D spectral element code and a detailed seismic velocity model for the Puget Sound region. This model includes realistic surface topography and a near‐surface...
Authors
Ian P. Stone, Erin A. Wirth, Arthur D. Frankel
Structure and Qp-Qs relations in the Seattle and Tualatin basins from converted seismic phases Structure and Qp-Qs relations in the Seattle and Tualatin basins from converted seismic phases
We use converted body‐wave phases from local earthquakes to constrain depth to basement and average attenuation relations for the Seattle basin in Washington and the Tualatin basin in Oregon. P‐, P‐to‐S‐(Ps), S‐to‐P‐(Sp), and S‐wave arrivals are present in three‐component recordings of magnitude 2.5–4.0 earthquakes at seismic stations located in these basins. Based on their relative...
Authors
Ian Stone, Erin A. Wirth, Arthur D. Frankel
Non-USGS Publications**
**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.
Science and Products
High frequency and region-scale simulations of large (Mw7+) earthquakes on the southern Whidbey Island fault, Washington, USA High frequency and region-scale simulations of large (Mw7+) earthquakes on the southern Whidbey Island fault, Washington, USA
We simulate ground shaking in western Washington State from hypothetical Mw7.0–7.5 earthquakes on the southern Whidbey Island fault (SWIF). Ground motions are modeled considering kinematic source distributions on a complex fault plane, a 3D seismic velocity model, and region‐specific soil velocity models. We run simulations with varying model resolutions, including regional‐scale...
Authors
Ian P. Stone, Erin A. Wirth, Alex R. Grant, Arthur D. Frankel
Three-dimensional seismic velocity model for the Cascadia Subduction Zone with shallow soils and topography, version 1.7 Three-dimensional seismic velocity model for the Cascadia Subduction Zone with shallow soils and topography, version 1.7
The U.S. Geological Survey’s seismic velocity model for the Cascadia Subduction Zone provides P- and S-wave velocity (VP and VS, respectively) information from 40.2° to 50.0° N. latitude and −129.0° to −121.0° W. longitude, and is used to support a variety of research topics, including three-dimensional (3D) earthquake simulations and seismic hazard assessment in the Pacific Northwest...
Authors
Erin A. Wirth, Alex R. Grant, Ian P. Stone, William J. Stephenson, Arthur D. Frankel
Earthquake probabilities and hazards in the U.S. Pacific Northwest Earthquake probabilities and hazards in the U.S. Pacific Northwest
Earthquakes and their cascading consequences pose a significant threat to the people, environment, infrastructure, and economy of the U.S. Pacific Northwest. The Pacific Northwest is susceptible to three types of earthquakes: deep (intraslab) earthquakes, subduction zone (megathrust) earthquakes, and shallow crustal earthquakes. For each of these earthquake types, earth scientists can...
Authors
Erin A. Wirth, Arthur D. Frankel, Brian L. Sherrod, Alex R. Grant, Audrey Dunham, Ian P. Stone, Julia Grossman
A soil velocity model for improved ground motion simulations in the U. S. Pacific Northwest A soil velocity model for improved ground motion simulations in the U. S. Pacific Northwest
Near-surface seismic velocity structure may significantly impact the intensity, duration, and frequency content of ground shaking during an earthquake. In this study, we compile 649 shear wave velocity (Vs) profiles throughout the U.S. Pacific Northwest and southern British Columbia (PNW) and use these measured profiles to develop a representative soil velocity model for four major...
Authors
Alex R. Grant, Erin A. Wirth, Ian P. Stone
Evidence of Seattle Fault earthquakes from patterns of deep-seated landslides Evidence of Seattle Fault earthquakes from patterns of deep-seated landslides
Earthquake‐induced landslides can record information about the seismic shaking that generated them. In this study, we present new mapping, Light Detection and Ranging‐derived roughness dating, and analysis of over 1000 deep‐seated landslides from the Puget Lowlands of Washington, U.S.A., to probe the landscape for past Seattle fault earthquake information. With this new landslide...
Authors
Erich Herzig, Alison Duvall, Adam Booth, Ian P. Stone, Erin A. Wirth, Sean Richard LaHusen, Joseph Wartman, Alex R. Grant
3-D wave propagation simulations of Mw 6.5+ earthquakes on the Tacoma Fault, Washington state, considering the effects of topography, a geotechnical gradient, and a fault damage zone 3-D wave propagation simulations of Mw 6.5+ earthquakes on the Tacoma Fault, Washington state, considering the effects of topography, a geotechnical gradient, and a fault damage zone
We simulate shaking in Tacoma, Washington, and surrounding areas from Mw 6.5 and 7.0 earthquakes on the Tacoma fault. Ground motions are directly modeled up to 2.5 Hz using kinematic, finite‐fault sources; a 3D seismic velocity model considering regional geology; and a model mesh with 30 m sampling at the ground surface. In addition, we explore how adjustments to the seismic velocity...
Authors
Ian P. Stone, Erin A. Wirth, Alex R. Grant, Arthur D. Frankel
Topographic response to simulated Mw 6.5-7.0 earthquakes on the Seattle Fault Topographic response to simulated Mw 6.5-7.0 earthquakes on the Seattle Fault
We explore the response of ground motions to topography during large crustal fault earthquakes by simulating several magnitude 6.5–7.0 rupture scenarios on the Seattle fault, Washington State. Kinematic simulations are run using a 3D spectral element code and a detailed seismic velocity model for the Puget Sound region. This model includes realistic surface topography and a near‐surface...
Authors
Ian P. Stone, Erin A. Wirth, Arthur D. Frankel
Structure and Qp-Qs relations in the Seattle and Tualatin basins from converted seismic phases Structure and Qp-Qs relations in the Seattle and Tualatin basins from converted seismic phases
We use converted body‐wave phases from local earthquakes to constrain depth to basement and average attenuation relations for the Seattle basin in Washington and the Tualatin basin in Oregon. P‐, P‐to‐S‐(Ps), S‐to‐P‐(Sp), and S‐wave arrivals are present in three‐component recordings of magnitude 2.5–4.0 earthquakes at seismic stations located in these basins. Based on their relative...
Authors
Ian Stone, Erin A. Wirth, Arthur D. Frankel
Non-USGS Publications**
**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.