Robert W Graves
Rob Graves is a geophysicist in the Earthquake Hazards Program.
Science and Products
Filter Total Items: 65
Broadband ground‐motion simulation of the 2011 Mw 6.2 Christchurch, New Zealand, earthquake Broadband ground‐motion simulation of the 2011 Mw 6.2 Christchurch, New Zealand, earthquake
This study presents the details and results of hybrid broadband (0–10 Hz) ground‐motion simulations for the 2011 MwMw 6.2 Christchurch, New Zealand, earthquake. The simulations utilize a 3D velocity model and a kinematic source model with stochastic realizations of the slip amplitude, rise time, and rake angle. The resulting ground motions capture the salient basin amplification effects...
Authors
Hoby Razafindrakoto, Brendon Bradley, Robert Graves
Integrate urban‐scale seismic hazard analyses with the U.S. National Seismic Hazard Model Integrate urban‐scale seismic hazard analyses with the U.S. National Seismic Hazard Model
For more than 20 yrs, damage patterns and instrumental recordings have highlighted the influence of the local 3D geologic structure on earthquake ground motions (e.g., MM 6.7 Northridge, California, Gao et al., 1996; MM 6.9 Kobe, Japan, Kawase, 1996; MM 6.8 Nisqually, Washington, Frankel, Carver, and Williams, 2002). Although this and other local‐scale features are critical to improving...
Authors
Morgan Moschetti, Nico Luco, Arthur Frankel, Mark Petersen, Brad Aagaard, Annemarie Baltay Sundstrom, Michael Blanpied, Oliver Boyd, Richard Briggs, Ryan Gold, Robert Graves, Stephen Hartzell, Sanaz Rezaeian, William Stephenson, David Wald, Robert A. Williams, Kyle Withers
U.S. Geological Survey National Strong-Motion Project strategic plan, 2017–22 U.S. Geological Survey National Strong-Motion Project strategic plan, 2017–22
The mission of the National Strong-Motion Project is to provide measurements of how the ground and built environment behave during earthquake shaking to the earthquake engineering community, the scientific community, emergency managers, public agencies, industry, media, and other users for the following purposes: Improving engineering evaluations and design methods for facilities and...
Authors
Brad Aagaard, Mehmet Celebi, Lind Gee, Robert Graves, Kishor Jaiswal, Erol Kalkan, Keith Knudsen, Nico Luco, James Smith, Jamison Steidl, Christopher Stephens
The 2015 Gorkha (Nepal) Earthquake sequence: I. Source modeling and deterministic 3D ground shaking The 2015 Gorkha (Nepal) Earthquake sequence: I. Source modeling and deterministic 3D ground shaking
To better quantify the relatively long period (
Authors
Shengji Wei, Meng Chen, Xin Wang, Robert Graves, Eric Lindsey, Teng Wang, Cagil Karakas, Don Helmberger
Performance of Irikura recipe rupture model generator in earthquake ground motion simulations with Graves and Pitarka hybrid approach Performance of Irikura recipe rupture model generator in earthquake ground motion simulations with Graves and Pitarka hybrid approach
We analyzed the performance of the Irikura and Miyake (Pure and Applied Geophysics 168(2011):85–104, 2011) (IM2011) asperity-based kinematic rupture model generator, as implemented in the hybrid broadband ground motion simulation methodology of Graves and Pitarka (Bulletin of the Seismological Society of America 100(5A):2095–2123, 2010), for simulating ground motion from crustal...
Authors
Arben Pitarka, Robert Graves, Kojiro Irikura, Hiroe Miyake, Arthur Rodgers
Subsurface geometry of the San Andreas fault in southern California: Results from the Salton Seismic Imaging Project (SSIP) and strong ground motion expectations Subsurface geometry of the San Andreas fault in southern California: Results from the Salton Seismic Imaging Project (SSIP) and strong ground motion expectations
The San Andreas fault (SAF) is one of the most studied strike‐slip faults in the world; yet its subsurface geometry is still uncertain in most locations. The Salton Seismic Imaging Project (SSIP) was undertaken to image the structure surrounding the SAF and also its subsurface geometry. We present SSIP studies at two locations in the Coachella Valley of the northern Salton trough. On our...
Authors
Gary Fuis, Klaus Bauer, Mark Goldman, Trond Ryberg, Victoria E. Langenheim, Daniel S. Scheirer, Michael Rymer, Joann Stock, John Hole, Rufus Catchings, Robert Graves, Brad Aagaard
Evidence for strong lateral seismic velocity variation in the lower crust and upper mantle beneath the California margin Evidence for strong lateral seismic velocity variation in the lower crust and upper mantle beneath the California margin
Regional seismograms from earthquakes in Northern California show a systematic difference in arrival times across Southern California where long period (30–50 seconds) SH waves arrive up to 15 seconds earlier at stations near the coast compared with sites towards the east at similar epicentral distances. We attribute this time difference to heterogeneity of the velocity structure at the...
Authors
Voon Lai, Robert Graves, Shengji Wei, Don Helmberger
Kinematic ground motion simulations on rough faults including effects of 3D stochastic velocity perturbations Kinematic ground motion simulations on rough faults including effects of 3D stochastic velocity perturbations
We describe a methodology for generating kinematic earthquake ruptures for use in 3D ground‐motion simulations over the 0–5 Hz frequency band. Our approach begins by specifying a spatially random slip distribution that has a roughly wavenumber‐squared fall‐off. Given a hypocenter, the rupture speed is specified to average about 75%–80% of the local shear wavespeed and the prescribed slip...
Authors
Robert Graves, Arben Pitarka
Refinements to the Graves and Pitarka (2010) Broadband Ground Motion Simulation Method Refinements to the Graves and Pitarka (2010) Broadband Ground Motion Simulation Method
This brief article describes refinements to the Graves and Pitarka (2010) broadband ground motion simulation methodology (GP2010 hereafter) that have been implemented in version 14.3 of the SCEC Broadband Platform (BBP). The updated version of our method on the current SCEC BBP is referred to as GP14.3. Our simulation technique is a hybrid approach that combines low-‐frequency and high-...
Authors
Robert Graves, Arben Pitarka
Ground motion-simulations of 1811-1812 New Madrid earthquakes, central United States Ground motion-simulations of 1811-1812 New Madrid earthquakes, central United States
We performed a suite of numerical simulations based on the 1811–1812 New Madrid seismic zone (NMSZ) earthquakes, which demonstrate the importance of 3D geologic structure and rupture directivity on the ground‐motion response throughout a broad region of the central United States (CUS) for these events. Our simulation set consists of 20 hypothetical earthquakes located along two faults...
Authors
L. Ramirez-Guzman, Robert Graves, Kim Olsen, Oliver Boyd, Chris Cramer, Stephen Hartzell, Sidao Ni, Paul Somerville, Robert Williams, Jinquan Zhong
The 2014 Mw6.1 South Napa Earthquake: A unilateral rupture with shallow asperity and rapid afterslip The 2014 Mw6.1 South Napa Earthquake: A unilateral rupture with shallow asperity and rapid afterslip
The Mw6.1 South Napa earthquake occurred near Napa, California on August 24, 2014 (UTC), and was the largest inland earthquake in Northern California since the 1989 Mw6.9 Loma Prieta earthquake. The first report of the earthquake from the Northern California Earthquake Data Center (NCEDC) indicates a hypocentral depth of 11.0km with longitude and latitude of (122.3105°W, 38.217°N)...
Authors
Shengji Wei, Sylvain Barbot, Robert Graves, James Lienkaemper, Teng Wang, Kenneth Hudnut, Yuning Fu, Don Helmberger
NGA-West2 Research Project NGA-West2 Research Project
The NGA-West2 project is a large multidisciplinary, multi-year research program on the Next Generation Attenuation (NGA) models for shallow crustal earthquakes in active tectonic regions. The research project has been coordinated by the Pacific Earthquake Engineering Research Center (PEER), with extensive technical interactions among many individuals and organizations. NGA-West2...
Authors
Yousef Bozorgnia, Norman A. Abrahamson, Linda Al Atik, Timothy Ancheta, Gail Atkinson, Jack W. Baker, Annemarie Baltay Sundstrom, David Boore, Kenneth Campbell, Brian Chiou, Robert Darragh, Steve Day, Jennifer Donahue, Robert Graves, Nick Gregor, Thomas Hanks, I. Idriss, Ronnie Kamai, Tadahiro Kishida, Albert Kottke, Stephen Mahin, Sanaz Rezaeian, Badie Rowshandel, Emel Seyhan, Shrey Shahi, Tom Shantz, Walter Silva, Paul Spudich, Jonathan Stewart, Jennie Watson-Lamprey, Kathryn Wooddell, Robert Youngs
Science and Products
Filter Total Items: 65
Broadband ground‐motion simulation of the 2011 Mw 6.2 Christchurch, New Zealand, earthquake Broadband ground‐motion simulation of the 2011 Mw 6.2 Christchurch, New Zealand, earthquake
This study presents the details and results of hybrid broadband (0–10 Hz) ground‐motion simulations for the 2011 MwMw 6.2 Christchurch, New Zealand, earthquake. The simulations utilize a 3D velocity model and a kinematic source model with stochastic realizations of the slip amplitude, rise time, and rake angle. The resulting ground motions capture the salient basin amplification effects...
Authors
Hoby Razafindrakoto, Brendon Bradley, Robert Graves
Integrate urban‐scale seismic hazard analyses with the U.S. National Seismic Hazard Model Integrate urban‐scale seismic hazard analyses with the U.S. National Seismic Hazard Model
For more than 20 yrs, damage patterns and instrumental recordings have highlighted the influence of the local 3D geologic structure on earthquake ground motions (e.g., MM 6.7 Northridge, California, Gao et al., 1996; MM 6.9 Kobe, Japan, Kawase, 1996; MM 6.8 Nisqually, Washington, Frankel, Carver, and Williams, 2002). Although this and other local‐scale features are critical to improving...
Authors
Morgan Moschetti, Nico Luco, Arthur Frankel, Mark Petersen, Brad Aagaard, Annemarie Baltay Sundstrom, Michael Blanpied, Oliver Boyd, Richard Briggs, Ryan Gold, Robert Graves, Stephen Hartzell, Sanaz Rezaeian, William Stephenson, David Wald, Robert A. Williams, Kyle Withers
U.S. Geological Survey National Strong-Motion Project strategic plan, 2017–22 U.S. Geological Survey National Strong-Motion Project strategic plan, 2017–22
The mission of the National Strong-Motion Project is to provide measurements of how the ground and built environment behave during earthquake shaking to the earthquake engineering community, the scientific community, emergency managers, public agencies, industry, media, and other users for the following purposes: Improving engineering evaluations and design methods for facilities and...
Authors
Brad Aagaard, Mehmet Celebi, Lind Gee, Robert Graves, Kishor Jaiswal, Erol Kalkan, Keith Knudsen, Nico Luco, James Smith, Jamison Steidl, Christopher Stephens
The 2015 Gorkha (Nepal) Earthquake sequence: I. Source modeling and deterministic 3D ground shaking The 2015 Gorkha (Nepal) Earthquake sequence: I. Source modeling and deterministic 3D ground shaking
To better quantify the relatively long period (
Authors
Shengji Wei, Meng Chen, Xin Wang, Robert Graves, Eric Lindsey, Teng Wang, Cagil Karakas, Don Helmberger
Performance of Irikura recipe rupture model generator in earthquake ground motion simulations with Graves and Pitarka hybrid approach Performance of Irikura recipe rupture model generator in earthquake ground motion simulations with Graves and Pitarka hybrid approach
We analyzed the performance of the Irikura and Miyake (Pure and Applied Geophysics 168(2011):85–104, 2011) (IM2011) asperity-based kinematic rupture model generator, as implemented in the hybrid broadband ground motion simulation methodology of Graves and Pitarka (Bulletin of the Seismological Society of America 100(5A):2095–2123, 2010), for simulating ground motion from crustal...
Authors
Arben Pitarka, Robert Graves, Kojiro Irikura, Hiroe Miyake, Arthur Rodgers
Subsurface geometry of the San Andreas fault in southern California: Results from the Salton Seismic Imaging Project (SSIP) and strong ground motion expectations Subsurface geometry of the San Andreas fault in southern California: Results from the Salton Seismic Imaging Project (SSIP) and strong ground motion expectations
The San Andreas fault (SAF) is one of the most studied strike‐slip faults in the world; yet its subsurface geometry is still uncertain in most locations. The Salton Seismic Imaging Project (SSIP) was undertaken to image the structure surrounding the SAF and also its subsurface geometry. We present SSIP studies at two locations in the Coachella Valley of the northern Salton trough. On our...
Authors
Gary Fuis, Klaus Bauer, Mark Goldman, Trond Ryberg, Victoria E. Langenheim, Daniel S. Scheirer, Michael Rymer, Joann Stock, John Hole, Rufus Catchings, Robert Graves, Brad Aagaard
Evidence for strong lateral seismic velocity variation in the lower crust and upper mantle beneath the California margin Evidence for strong lateral seismic velocity variation in the lower crust and upper mantle beneath the California margin
Regional seismograms from earthquakes in Northern California show a systematic difference in arrival times across Southern California where long period (30–50 seconds) SH waves arrive up to 15 seconds earlier at stations near the coast compared with sites towards the east at similar epicentral distances. We attribute this time difference to heterogeneity of the velocity structure at the...
Authors
Voon Lai, Robert Graves, Shengji Wei, Don Helmberger
Kinematic ground motion simulations on rough faults including effects of 3D stochastic velocity perturbations Kinematic ground motion simulations on rough faults including effects of 3D stochastic velocity perturbations
We describe a methodology for generating kinematic earthquake ruptures for use in 3D ground‐motion simulations over the 0–5 Hz frequency band. Our approach begins by specifying a spatially random slip distribution that has a roughly wavenumber‐squared fall‐off. Given a hypocenter, the rupture speed is specified to average about 75%–80% of the local shear wavespeed and the prescribed slip...
Authors
Robert Graves, Arben Pitarka
Refinements to the Graves and Pitarka (2010) Broadband Ground Motion Simulation Method Refinements to the Graves and Pitarka (2010) Broadband Ground Motion Simulation Method
This brief article describes refinements to the Graves and Pitarka (2010) broadband ground motion simulation methodology (GP2010 hereafter) that have been implemented in version 14.3 of the SCEC Broadband Platform (BBP). The updated version of our method on the current SCEC BBP is referred to as GP14.3. Our simulation technique is a hybrid approach that combines low-‐frequency and high-...
Authors
Robert Graves, Arben Pitarka
Ground motion-simulations of 1811-1812 New Madrid earthquakes, central United States Ground motion-simulations of 1811-1812 New Madrid earthquakes, central United States
We performed a suite of numerical simulations based on the 1811–1812 New Madrid seismic zone (NMSZ) earthquakes, which demonstrate the importance of 3D geologic structure and rupture directivity on the ground‐motion response throughout a broad region of the central United States (CUS) for these events. Our simulation set consists of 20 hypothetical earthquakes located along two faults...
Authors
L. Ramirez-Guzman, Robert Graves, Kim Olsen, Oliver Boyd, Chris Cramer, Stephen Hartzell, Sidao Ni, Paul Somerville, Robert Williams, Jinquan Zhong
The 2014 Mw6.1 South Napa Earthquake: A unilateral rupture with shallow asperity and rapid afterslip The 2014 Mw6.1 South Napa Earthquake: A unilateral rupture with shallow asperity and rapid afterslip
The Mw6.1 South Napa earthquake occurred near Napa, California on August 24, 2014 (UTC), and was the largest inland earthquake in Northern California since the 1989 Mw6.9 Loma Prieta earthquake. The first report of the earthquake from the Northern California Earthquake Data Center (NCEDC) indicates a hypocentral depth of 11.0km with longitude and latitude of (122.3105°W, 38.217°N)...
Authors
Shengji Wei, Sylvain Barbot, Robert Graves, James Lienkaemper, Teng Wang, Kenneth Hudnut, Yuning Fu, Don Helmberger
NGA-West2 Research Project NGA-West2 Research Project
The NGA-West2 project is a large multidisciplinary, multi-year research program on the Next Generation Attenuation (NGA) models for shallow crustal earthquakes in active tectonic regions. The research project has been coordinated by the Pacific Earthquake Engineering Research Center (PEER), with extensive technical interactions among many individuals and organizations. NGA-West2...
Authors
Yousef Bozorgnia, Norman A. Abrahamson, Linda Al Atik, Timothy Ancheta, Gail Atkinson, Jack W. Baker, Annemarie Baltay Sundstrom, David Boore, Kenneth Campbell, Brian Chiou, Robert Darragh, Steve Day, Jennifer Donahue, Robert Graves, Nick Gregor, Thomas Hanks, I. Idriss, Ronnie Kamai, Tadahiro Kishida, Albert Kottke, Stephen Mahin, Sanaz Rezaeian, Badie Rowshandel, Emel Seyhan, Shrey Shahi, Tom Shantz, Walter Silva, Paul Spudich, Jonathan Stewart, Jennie Watson-Lamprey, Kathryn Wooddell, Robert Youngs