Robert Graves
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Ground Motion Variability During the February 6, 2023 M7.8 Kahramanmaraş Earthquake, Türkiye Open
On February 6, 2023, two catastrophic earthquakes struck the Kahramanmaraş region, marking some of the most destructive seismic events in modern Turkish history. These earthquakes caused extensive loss of life and widespread destruction ac…
View article: The 17 January 1994 Northridge, California, Earthquake: A Retrospective Analysis
The 17 January 1994 Northridge, California, Earthquake: A Retrospective Analysis Open
The 17 January 1994 Northridge, California, earthquake was a watershed event with far-reaching societal and scientific impacts. The earthquake, which occurred in the early days of both broadband seismic networks and the Internet, spurred a…
View article: Using open-science workflow tools to produce SCEC CyberShake physics-based probabilistic seismic hazard models
Using open-science workflow tools to produce SCEC CyberShake physics-based probabilistic seismic hazard models Open
The Statewide (formerly Southern) California Earthquake Center (SCEC) conducts multidisciplinary earthquake system science research that aims to develop predictive models of earthquake processes, and to produce accurate seismic hazard info…
View article: Modern Products for a Vintage Event: An Update on the 1933 Long Beach, California, Earthquake
Modern Products for a Vintage Event: An Update on the 1933 Long Beach, California, Earthquake Open
When a notable earthquake occurs in the United States, a range of familiar real- and near-real-time products are produced by the U.S. Geological Survey (USGS) Advanced National Seismic System (ANSS), and made available via the ANSS Compreh…
View article: Preparing Seismic Applications for Exascale Using Scientific Workflows
Preparing Seismic Applications for Exascale Using Scientific Workflows Open
Scientific workflows are key to supporting the execution of large-scale simulations in many scientific domains, including solid earth geophysics. Although many different workflow tools exist, they share common features, enabling applicatio…
Using a grid-search approach to validate the Graves–Pitarka broadband simulation method Open
This work assesses the ability of the Graves–Pitarka simulation approach to reproduce observed ground motions for 12 California and Baja California earthquakes. A total of 240 realizations are computed for each earthquake and compared with…
Refinements to the Graves–Pitarka Kinematic Rupture Generator, Including a Dynamically Consistent Slip-Rate Function, Applied to the 2019 Mw 7.1 Ridgecrest Earthquake Open
The main objective of this study is to develop physics-based constraints on the spatiotemporal variation of the slip-rate function using a simplified dynamic rupture model. First, we performed dynamic rupture modeling of the 2019 Mw 7.1 Ri…
Regional Calibration of Hybrid Ground-Motion Simulations in Moderate Seismicity Areas: Application to the Upper Rhine Graben Open
This study presents the coupling of the spectral decomposition results for anelastic attenuation, stress drop, and site effects with the Graves-Pitarka (GP) hybrid ground-motion simulation methodology, as implemented on the Southern Califo…
Embedding Spectral Decomposition Results in Broadband Simulation: Application to Rhine Graben Area Open
Over the past decade, there is growing consensus that physics-based simulations can be utilized in engineering applications. However, for the simulations to be accepted, they need to be calibrated and validated. This study presents the res…
Source modelling considerations for ground motion simulation validation of moderate magnitude active shallow crustal earthquakes in New Zealand Open
This paper summarises progress toward NZ-wide physics-based hybrid broadband ground motion \nsimulation validation of moderate magnitude (5.0 4s) and have lower total standard deviation at short periods (T < 2s). Future work \nincludes sim…
Characterization of Shallow Rupture Kinematics in Strong Ground Motion Simulations of Strike-Slip Earthquakes Constrained by Dynamic Rupture Modeling Open
The objective of our study is the improvement of shallow rupture characterization in kinematic rupture models used in strong ground motion simulations. Based on geological investigations, earthquake stress drop, depth-variation of seismici…
Hybrid broadband ground motion simulation validation of small magnitude earthquakes in Canterbury, New Zealand Open
Ground motion simulation validation is an important and necessary task toward establishing the efficacy of physics-based ground motion simulations for seismic hazard analysis and earthquake engineering applications. This article presents a…
Full waveform seismic tomography for geophysical velocity model in the South Island region New Zealand based on adjoint-wavefield method Open
In this poster we present the results of applying Full Waveform Tomography (FWT), based on the Adjoint-Wavefield (AW) method, to iteratively invert a 3-D geophysical velocity model for the South Island region (Eberhart-Phillips et al., 201…
View article: Source considerations for moderate magnitude earthquake ground motion simulation validation
Source considerations for moderate magnitude earthquake ground motion simulation validation Open
In New Zealand, previous hybrid broadband ground motion simulation validation efforts were initially focussed on large magnitude (Mw) earthquakes, and more recently on small magnitude earthquakes (3.5<Mw≤5.0). Both regional and nation-wide…
Preliminary examination of kinematic rupture parameter variability in simulated ground motions Open
This paper investigates the effects of variability in source rupture parameters on site-specific \nphysics-based simulated ground motions, ascertained through the systematic analysis of ground \nmotion intensity measures. As a preliminary …
View article: Central and Eastern North America Ground-Motion Characterization (NGA-East)
Central and Eastern North America Ground-Motion Characterization (NGA-East) Open
This document is the final project report of the Next Generation Attenuation for Central and Eastern North America (CENA) project (NGA-East). The NGA-East objective was to develop a new ground-motion characterization (GMC) model for the CE…
View article: Site-Specific MCER Response Spectra for Los Angeles Region based on 3-D Numerical Simulations and the NGA West2 Equations
Site-Specific MCER Response Spectra for Los Angeles Region based on 3-D Numerical Simulations and the NGA West2 Equations Open
The Utilization of Ground Motion Simulation (UGMS) committee of the Southern California Earthquake Center (SCEC) developed site-specific, risk-targeted Maximum Considered Earthquake (MCER) response spectra for the Los Angeles region. The l…
View article: Site-Specific MCER Response Spectra for Los Angeles Region based on 3-D Numerical Simulations and the NGA West2 Equations
Site-Specific MCER Response Spectra for Los Angeles Region based on 3-D Numerical Simulations and the NGA West2 Equations Open
The Utilization of Ground Motion Simulation (UGMS) committee of the Southern California Earthquake Center (SCEC) developed site-specific, risk-targeted Maximum Considered Earthquake (MCER) response spectra for the Los Angeles region. The l…
View article: NGA-East Ground-Motion Models for the U.S. Geological Survey National Seismic Hazard Maps
NGA-East Ground-Motion Models for the U.S. Geological Survey National Seismic Hazard Maps Open
The purpose of this report is to provide a set of ground motion models (GMMs) to be considered by the U.S. Geological Survey (USGS) for their National Seismic Hazard Maps (NSHMs) for the Central and Eastern U.S. (CEUS). These interim GMMs …
Performance of Irikura Recipe Rupture Model Generator in Earthquake Ground Motion Simulations with Graves and Pitarka Hybrid Approach Open
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 methodolo…
Kinematic Ground‐Motion Simulations on Rough Faults Including Effects of 3D Stochastic Velocity Perturbations Open
Here, 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 …
Broadband ground motion simulation of the 2010-2011 Canterbury earthquake sequence Open
In this paper, we perform hybrid broadband (0-10 Hz) ground motion \nsimulations for the ten most significant events (Mw 4.7-7.1) in the 2010-2011 Canterbury \nearthquake sequence. Taking advantage of having repeated recordings at same sta…
Effects of realistic fault geometry on simulated ground motions in the 2010 Darfield Earthquake Open
Source representation is an essential component of physics-based ground motion \nsimulations. However, its inherent non-uniqueness leads to different representations \nfor the same fault rupture. For the 2010 Darfield earthquake, various s…