Member Since 1982
Norm A. Abrahamson
Adjunct professor, University of California Berkeley
AGU Research
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Correlation of Non-ergodic Path Effects for Peak Ground Motion and Duration with Macroseismic Intensity in California
THE VALUE OF MACROSEISMIC INTENSITY DATA: FROM EARTHQUAKE SOURCE CHARACTERIZATION TO GROUND MOTION AND SEISMIC HAZARD ESTIMATION AND TESTING II POSTER
seismology | 15 december 2023
Chih Hsuan Sung, Norman A. Abrahamson
The field of ground-motion models (GMMs) has been moving from ergodic models that are average models for large regions to non-ergodic models that incl...
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How Well Can Macroseismic Intensities Constrain Moment Magnitude?
THE VALUE OF MACROSEISMIC INTENSITY DATA: FROM EARTHQUAKE SOURCE CHARACTERIZATION TO GROUND MOTION AND SEISMIC HAZARD ESTIMATION AND TESTING I ORAL
seismology | 14 december 2023
Madeleine C Lucas, Susan E. Hough, Seth Stein, Lea...
Macroseismic data are valuable, and often required, to constrain earthquake source parameters for historical (pre-instrumental) earthquakes. Current m...
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Effects of the limitations of current ground-motion intensity conversion equations (GMICE) on intensity estimates for ShakeMap applications
THE VALUE OF MACROSEISMIC INTENSITY DATA: FROM EARTHQUAKE SOURCE CHARACTERIZATION TO GROUND MOTION AND SEISMIC HAZARD ESTIMATION AND TESTING I ORAL
seismology | 14 december 2023
Norman A. Abrahamson
ShakeMap and ShakeAlert use both ground-motion data and intensity data which requires conversions between ground-motion data and intensity data. The m...
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Biases in Ground-Motion to Intensity Conversion Equations (GMICE): Causes and Updated Methodologies
THE VALUE OF MACROSEISMIC INTENSITY DATA: FROM EARTHQUAKE SOURCE CHARACTERIZATION TO GROUND MOTION AND SEISMIC HAZARD ESTIMATION AND TESTING I ORAL
seismology | 14 december 2023
Molly M. Gallahue, Norman A. Abrahamson
Ground-motion to intensity conversion equations (GMICE) allow for conversion between ground-motion amplitude and shaking intensity. The current method...
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Shortening the time to move natural-hazard research to engineering practice: examples from earthquake ground-motion research
GILBERT F. WHITE DISTINGUISHED LECTURE
natural hazards | 11 december 2023
Norman A. Abrahamson
The end goal of natural hazard research is to reduce future loses from natural hazards. The issue for researchers is how to get their research used in...
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Re-evaluating Ground Motion Intensity Conversion Equations for California and Implications for Hazard Map Assessment
SEISMOLOGY CONTRIBUTIONS: EARTHQUAKE GROUND MOTIONS AND ENGINEERING SEISMOLOGY III ORAL
seismology | 15 december 2022
Molly M. Gallahue, Norman A. Abrahamson
Ground-motion intensity conversion equations (GMICE) are used to describe the relationship between ground-motion amplitude and shaking intensity. GMIC...
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Why does PSHA overpredict historically observed shaking data?
SEISMOLOGY CONTRIBUTIONS: EARTHQUAKE GROUND MOTIONS AND ENGINEERING SEISMOLOGY III ORAL
seismology | 15 december 2022
Leah Salditch, Molly M. Gallahue, James S. Neely,...
Probabilistic seismic hazard assessments (PSHA) based on current practice consistently appear to overpredict historically observed shaking data. Compa...
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Partially Non-ergodic Ground-Motion Model for the Cascadia Subduction Zone
SEISMOLOGY CONTRIBUTIONS: EARTHQUAKE GROUND MOTIONS AND ENGINEERING SEISMOLOGY II ORAL
seismology | 13 december 2021
Chih Hsuan Sung, Norman A. Abrahamson
Three new ground-motion models (GMMs) for subduction zones were developed as part of the NGA-Sub project. These models included regional differences i...
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