A5067921901- earthquake and tectonic studies
- Seismic Waves and Analysis
- Seismic Performance and Analysis
- High-pressure geophysics and materials
- Seismic Imaging and Inversion Techniques
- Earthquake Detection and Analysis
- Seismology and Earthquake Studies
- Structural Health Monitoring Techniques
- Geophysical Methods and Applications
- Geological and Geochemical Analysis
- Masonry and Concrete Structural Analysis
University of Southern California
2019-2025
Southern California Earthquake Center
2019-2025
Verisk Analytics (United States)
2025
San Diego State University
2017-2020
Scripps Institution of Oceanography
2017-2020
University of California, San Diego
2017-2020
Abstract Earthquake source properties such as seismic moment and stress drop are routinely estimated from far‐field body wave amplitude spectra. Some quantitative but model‐dependent relations have been established between spectra parameters. However, large variability is seen in the parameter estimates, it uncertain how partitioned among real parameters, observational error, modeling error due to complexity of earthquake behaviors. models with dynamic weakening found exhibit two different...
Abstract Improving accuracy and reducing uncertainty in ground motion models (GMMs) are crucial for the safe design of infrastructure. Traditional GMMs often oversimplify source complexity, such as stress drop, due to high variability estimation. This study aims address this issue by extracting robust spatial variations drop estimates residuals. We introduce a non‐ergodic modeling framework using Bayesian Gaussian Process regression analyze data from over 5,000 earthquakes (M2‐4.5) San...
Abstract The 15 April 2015 M w 7.8 Nepal Gorkha earthquake occurred on a shallowly dipping portion of the Main Himalayan Thrust (MHT). Notable features event include (1) dominance slip pulse about 6‐s duration that unlocked lower edge MHT and (2) near‐horizontal fault geometry, which, combined with proximity free surface, allows surface‐reflected phases to break across‐fault symmetries seismic wavefield. Our dynamic rupture simulations in an elastoplastic medium yield parameters comparable...
ABSTRACT Coseismic fault displacements in large earthquakes have caused significant damage to structures and lifelines on near lines. represent a real threat, especially distributed infrastructure systems. For systems that can not avoid active faults, engineering displacement demands are defined using probabilistic fault-displacement hazard analyses (PFDHA). However, PFDHA models sparse poorly constrained partly due the scarcity of detailed observations. Advancements dynamic rupture...
ABSTRACT A review of a collection theoretical source spectral models revealed: (1) Despite the well-known variation in predicting static stress drop Δσs from seismic moment and corner frequency, all models, especially three conventional suggest that earthquakes radiate about half available strain energy into surrounding medium. This similarity justifies less model-dependent approach to estimate Δσs, though estimates for natural rely on apparent radiation efficiency (=2σa/Δσs; σa is an...
Research Article| September 25, 2017 Fourth‐Order Staggered‐Grid Finite‐Difference Seismic Wavefield Estimation Using a Discontinuous Mesh Interface (WEDMI) Shiying Nie; Nie aDepartment of Geological Sciences, San Diego State University, 5500 Campanile Drive, Diego, California 92182, snie-w@sdsu.edu, yow004@ucsd.edu, kbolsen@mail.sdsu.edu, sday@mail.sdsu.edu Search for other works by this author on: GSW Google Scholar Yongfei Wang; Wang sday@mail.sdsu.edubAlso at Institute Geophysics and...
Abstract Near‐fault motion is often dominated by long‐period, pulse‐like particle velocities with fault‐normal polarization that, when enhanced directivity, may strongly excite middle‐ to high‐rise structures. We assess the extent which plastic yielding affect amplitude, frequency content, and distance scaling of near‐fault directivity pulses. Dynamic simulations 3‐D strike‐slip ruptures reveal significant plasticity effects, these persist geometrical fault roughness added. With without...
A new surface-rupture-length (SRL) relationship as a function of magnitude [Formula: see text], fault thickness, and dip angle is presented in this article. The objective study to model the change scaling between unbounded width-limited ruptures. This achieved through use seismological-theory-based relationships for average displacement aid dynamic rupture simulations constrain width scaling. empirical data set used development composed text] events ranging from 5 SRL 1.1 432 km. includes...
Near-fault motion is often dominated by long-period, pulse-like particle velocities with fault-normal polarization that, when enhanced directivity, may strongly excite mid- to high-rise structures. We assess the extent which plastic yielding affect amplitude, frequency content, and distance scaling of near-fault directivity pulses. Dynamic simulations 3D strike-slip ruptures reveal significant plasticity effects, these persist geometrical fault roughness added. With without off-fault...
A new surface-rupture-length ($SRL$) relationship as a function of magnitude ($\mathbf{M}$), fault thickness, and dip angle is presented in this paper. The objective study to model the change scaling between unbounded width-limited ruptures. This achieved through use seismological-theory-based relationships for average displacement aid dynamic rupture simulations constrain width scaling. empirical dataset used development composed $123$ events ranging from $\mathbf{M}~5$ $8.1$ $SRL~1.1$...
ABSTRACT Coseismic surface fault displacement presents a serious potential hazard for structures and lifeline infrastructure. Distributed infrastructure tends to cover large distances may cross faults in multiple locations, especially active tectonic regions like California. However, measurements engineering applications are quite sparse, rendering the development of predictive models extremely difficult fraught with uncertainties. Detailed rupture mapping products exist few documented...