Robert W Graves
Rob Graves is a geophysicist in the Earthquake Hazards Program.
Science and Products
Filter Total Items: 65
Adding fling effects to processed ground‐motion time histories Adding fling effects to processed ground‐motion time histories
Fling is the engineering term for the effects of the permanent tectonic offset, caused by a rupturing fault in the recorded ground motions near the fault. It is expressed by a one‐sided pulse in ground velocity and a nonzero final displacement at the end of shaking. Standard processing of earthquake time histories removes some of the fling effects that may be required for engineering...
Authors
Ronnie Kamai, Norman A. Abrahamson, Robert Graves
Engineering uses of physics-based ground motion simulations Engineering uses of physics-based ground motion simulations
This paper summarizes validation methodologies focused on enabling ground motion simulations to be used with confidence in engineering applications such as seismic hazard analysis and dynmaic analysis of structural and geotechnical systems. Numberical simullation of ground motion from large erthquakes, utilizing physics-based models of earthquake rupture and wave propagation, is an area...
Authors
Jack W. Baker, Nicolas Luco, Norman A. Abrahamson, Robert W. Graves, Phillip J. Maechling, Kim Olsen
CyberShake-derived ground-motion prediction models for the Los Angeles region with application to earthquake early warning CyberShake-derived ground-motion prediction models for the Los Angeles region with application to earthquake early warning
Real-time applications such as earthquake early warning (EEW) typically use empirical ground-motion prediction equations (GMPEs) along with event magnitude and source-to-site distances to estimate expected shaking levels. In this simplified approach, effects due to finite-fault geometry, directivity and site and basin response are often generalized, which may lead to a significant under-...
Authors
Maren Bose, Robert Graves, David Gill, Scott Callaghan, Phillip J. Maechling
Calibration of semi-stochastic procedure for simulating high-frequency ground motions Calibration of semi-stochastic procedure for simulating high-frequency ground motions
Broadband ground motion simulation procedures typically utilize physics-based modeling at low frequencies, coupled with semi-stochastic procedures at high frequencies. The high-frequency procedure considered here combines deterministic Fourier amplitude spectra (dependent on source, path, and site models) with random phase. Previous work showed that high-frequency intensity measures from...
Authors
Emel Seyhan, Jonathan P. Stewart, Robert Graves
Rupture complexity of the Mw 8.3 sea of okhotsk earthquake: Rapid triggering of complementary earthquakes? Rupture complexity of the Mw 8.3 sea of okhotsk earthquake: Rapid triggering of complementary earthquakes?
We derive a finite slip model for the 2013 Mw 8.3 Sea of Okhotsk Earthquake (Z = 610 km) by inverting calibrated teleseismic P waveforms. The inversion shows that the earthquake ruptured on a 10° dipping rectangular fault zone (140 km × 50 km) and evolved into a sequence of four large sub-events (E1–E4) with an average rupture speed of 4.0 km/s. The rupture process can be divided into...
Authors
Shengji Wei, Don Helmberger, Zhongwen Zhan, Robert Graves
Implications of the Mw9.0 Tohoku-Oki earthquake for ground motion scaling with source, path, and site parameters Implications of the Mw9.0 Tohoku-Oki earthquake for ground motion scaling with source, path, and site parameters
The Mw9.0 Tohoku-oki Japan earthquake produced approximately 2,000 ground motion recordings. We consider 1,238 three-component accelerograms corrected with component-specific low-cut filters. The recordings have rupture distances between 44 km and 1,000 km, time-averaged shear wave velocities of VS30 = 90 m/s to 1,900 m/s, and usable response spectral periods of 0.01 sec to >10 sec. The...
Authors
Jonathan P. Stewart, Saburoh Midorikawa, Robert W. Graves, Khatareh Khodaverdi, Tadahiro Kishida, Hiroyuki Miura, Yousef Bozorgnia, Kenneth W. Campbell
Science and Products
Filter Total Items: 65
Adding fling effects to processed ground‐motion time histories Adding fling effects to processed ground‐motion time histories
Fling is the engineering term for the effects of the permanent tectonic offset, caused by a rupturing fault in the recorded ground motions near the fault. It is expressed by a one‐sided pulse in ground velocity and a nonzero final displacement at the end of shaking. Standard processing of earthquake time histories removes some of the fling effects that may be required for engineering...
Authors
Ronnie Kamai, Norman A. Abrahamson, Robert Graves
Engineering uses of physics-based ground motion simulations Engineering uses of physics-based ground motion simulations
This paper summarizes validation methodologies focused on enabling ground motion simulations to be used with confidence in engineering applications such as seismic hazard analysis and dynmaic analysis of structural and geotechnical systems. Numberical simullation of ground motion from large erthquakes, utilizing physics-based models of earthquake rupture and wave propagation, is an area...
Authors
Jack W. Baker, Nicolas Luco, Norman A. Abrahamson, Robert W. Graves, Phillip J. Maechling, Kim Olsen
CyberShake-derived ground-motion prediction models for the Los Angeles region with application to earthquake early warning CyberShake-derived ground-motion prediction models for the Los Angeles region with application to earthquake early warning
Real-time applications such as earthquake early warning (EEW) typically use empirical ground-motion prediction equations (GMPEs) along with event magnitude and source-to-site distances to estimate expected shaking levels. In this simplified approach, effects due to finite-fault geometry, directivity and site and basin response are often generalized, which may lead to a significant under-...
Authors
Maren Bose, Robert Graves, David Gill, Scott Callaghan, Phillip J. Maechling
Calibration of semi-stochastic procedure for simulating high-frequency ground motions Calibration of semi-stochastic procedure for simulating high-frequency ground motions
Broadband ground motion simulation procedures typically utilize physics-based modeling at low frequencies, coupled with semi-stochastic procedures at high frequencies. The high-frequency procedure considered here combines deterministic Fourier amplitude spectra (dependent on source, path, and site models) with random phase. Previous work showed that high-frequency intensity measures from...
Authors
Emel Seyhan, Jonathan P. Stewart, Robert Graves
Rupture complexity of the Mw 8.3 sea of okhotsk earthquake: Rapid triggering of complementary earthquakes? Rupture complexity of the Mw 8.3 sea of okhotsk earthquake: Rapid triggering of complementary earthquakes?
We derive a finite slip model for the 2013 Mw 8.3 Sea of Okhotsk Earthquake (Z = 610 km) by inverting calibrated teleseismic P waveforms. The inversion shows that the earthquake ruptured on a 10° dipping rectangular fault zone (140 km × 50 km) and evolved into a sequence of four large sub-events (E1–E4) with an average rupture speed of 4.0 km/s. The rupture process can be divided into...
Authors
Shengji Wei, Don Helmberger, Zhongwen Zhan, Robert Graves
Implications of the Mw9.0 Tohoku-Oki earthquake for ground motion scaling with source, path, and site parameters Implications of the Mw9.0 Tohoku-Oki earthquake for ground motion scaling with source, path, and site parameters
The Mw9.0 Tohoku-oki Japan earthquake produced approximately 2,000 ground motion recordings. We consider 1,238 three-component accelerograms corrected with component-specific low-cut filters. The recordings have rupture distances between 44 km and 1,000 km, time-averaged shear wave velocities of VS30 = 90 m/s to 1,900 m/s, and usable response spectral periods of 0.01 sec to >10 sec. The...
Authors
Jonathan P. Stewart, Saburoh Midorikawa, Robert W. Graves, Khatareh Khodaverdi, Tadahiro Kishida, Hiroyuki Miura, Yousef Bozorgnia, Kenneth W. Campbell