Alexandra (Alex) Hatem
My research is focused on how to best describe the behavior of active faults in the recent past. I use methods such as paleoseismology, slip rate studies, topographic analysis, numerical modeling and tectonic reconstructions to understand how earthquakes occur in space and time, both on single faults and within larger fault systems.
Overall, I am interested in how faults evolve over time and characterizing variability and evolution of fault behavior on across different space-time scales. An overarching goal of my work is to understand how to represent geological constraints within hazard models, like the National Seismic Hazard Map and the Uniform California Earthquake Rupture Forecast.
Professional Experience
Research Geologist: USGS-GHSC, 2020-present
Mendenhall post-doctoral fellow: USGS-GHSC, 2019-2020
Education
PhD: University of Southern California, 2019
MS: University of Massachusetts, Amherst, 2014
BA: Wellesley College, 2012
Science and Products
Earthquake geology inputs for the National Seismic Hazard Model (NSHM) 2023 (central and eastern United States), version 1.0
Earthquake geology inputs for the National Seismic Hazard Model (NSHM) 2025 (Puerto Rico and U.S. Virgin Islands), version 1.0
Data Release for the 2023 U.S. 50-State National Seismic Hazard Model - Overview
Earthquake geology inputs for the U.S. National Seismic Hazard Model (NSHM) 2023 (western U.S.) (ver. 3.0, December 2023)
Fault Rupture Mapping of the 6 February 2023 Kahramanmaraş, Türkiye, Earthquake Sequence from Satellite Data (ver. 1.1, February 2024)
Western U.S. geologic deformation model for use in the U.S. National Seismic Hazard Model 2023, version 1.0
Geodetic deformation model results and corrections for use in U.S. National Seismic Hazard Model 2023
Plotting multiple fault representations: Applications for National Seismic Hazard Model 2023 update (NSHM-faultmaps)
Compilation of geologic slip rate constraints used in 1996-2014 U.S. National Seismic Hazard Models (ver. 2.0, February 2022)
Earthquake geology inputs for the U.S. National Seismic Hazard Model (NSHM) 2023 (western US) (ver. 2.0, February 2022)
Summary of proposed changes to geologic inputs for the U.S. National Seismic Hazard Model (NSHM) 2023, version 1.0
Earthquake geology inputs for the U.S. National Seismic Hazard Model (NSHM) 2023, version 1.0
Surface Rupture Map of the 2020 M 6.5 Monte Cristo Range earthquake, Esmeralda and Mineral counties, Nevada
Earthquake rupture forecast model construction for the 2023 U.S. 50‐State National Seismic Hazard Model Update: Central and eastern U.S. fault‐based source model
The 2023 US 50-State National Seismic Hazard Model: Overview and implications
The USGS 2023 Conterminous U.S. time‐independent earthquake rupture forecast
We present the 2023 U.S. Geological Survey time‐independent earthquake rupture forecast for the conterminous United States, which gives authoritative estimates of the magnitude, location, and time‐averaged frequency of potentially damaging earthquakes throughout the region. In addition to updating virtually all model components, a major focus has been to provide a better representation of epistemi
Rapid Source Characterization of the 2023 Mw 6.8 Al Haouz, Morocco, Earthquake
Rapid surface rupture mapping from satellite data: The 2023 Kahramanmaraş, Turkey (Türkiye), earthquake sequence
Rapid characterization of the February 2023 Kahramanmaraş, Turkey, earthquake sequence
Preface to the focus section on deformation models for the U.S. National Seismic Hazard Model
Western U.S. geologic deformation model for use in the U.S. National Seismic Hazard Model 2023
Western U.S. deformation models for the 2023 update to the U.S. National Seismic Hazard Model
Simplifying complex fault data for systems-level analysis: Earthquake geology inputs for U.S. NSHM 2023
How similar was the 1983 Mw 6.9 Borah Peak earthquake rupture to its surface-faulting predecessors along the northern Lost River fault zone (Idaho, USA)?
STEPS: Slip time earthquake path simulations applied to the San Andreas and Toe Jam Hill Faults to redefine geologic slip rate uncertainty
Non-USGS Publications**
**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.
STEPS: Slip Time Earthquake Path Simulations applied to the San Andreas and Toe Jam Hill faults to redefine geologic slip rate uncertainty (Matlab code)
Science and Products
Earthquake geology inputs for the National Seismic Hazard Model (NSHM) 2023 (central and eastern United States), version 1.0
Earthquake geology inputs for the National Seismic Hazard Model (NSHM) 2025 (Puerto Rico and U.S. Virgin Islands), version 1.0
Data Release for the 2023 U.S. 50-State National Seismic Hazard Model - Overview
Earthquake geology inputs for the U.S. National Seismic Hazard Model (NSHM) 2023 (western U.S.) (ver. 3.0, December 2023)
Fault Rupture Mapping of the 6 February 2023 Kahramanmaraş, Türkiye, Earthquake Sequence from Satellite Data (ver. 1.1, February 2024)
Western U.S. geologic deformation model for use in the U.S. National Seismic Hazard Model 2023, version 1.0
Geodetic deformation model results and corrections for use in U.S. National Seismic Hazard Model 2023
Plotting multiple fault representations: Applications for National Seismic Hazard Model 2023 update (NSHM-faultmaps)
Compilation of geologic slip rate constraints used in 1996-2014 U.S. National Seismic Hazard Models (ver. 2.0, February 2022)
Earthquake geology inputs for the U.S. National Seismic Hazard Model (NSHM) 2023 (western US) (ver. 2.0, February 2022)
Summary of proposed changes to geologic inputs for the U.S. National Seismic Hazard Model (NSHM) 2023, version 1.0
Earthquake geology inputs for the U.S. National Seismic Hazard Model (NSHM) 2023, version 1.0
Surface Rupture Map of the 2020 M 6.5 Monte Cristo Range earthquake, Esmeralda and Mineral counties, Nevada
Earthquake rupture forecast model construction for the 2023 U.S. 50‐State National Seismic Hazard Model Update: Central and eastern U.S. fault‐based source model
The 2023 US 50-State National Seismic Hazard Model: Overview and implications
The USGS 2023 Conterminous U.S. time‐independent earthquake rupture forecast
We present the 2023 U.S. Geological Survey time‐independent earthquake rupture forecast for the conterminous United States, which gives authoritative estimates of the magnitude, location, and time‐averaged frequency of potentially damaging earthquakes throughout the region. In addition to updating virtually all model components, a major focus has been to provide a better representation of epistemi
Rapid Source Characterization of the 2023 Mw 6.8 Al Haouz, Morocco, Earthquake
Rapid surface rupture mapping from satellite data: The 2023 Kahramanmaraş, Turkey (Türkiye), earthquake sequence
Rapid characterization of the February 2023 Kahramanmaraş, Turkey, earthquake sequence
Preface to the focus section on deformation models for the U.S. National Seismic Hazard Model
Western U.S. geologic deformation model for use in the U.S. National Seismic Hazard Model 2023
Western U.S. deformation models for the 2023 update to the U.S. National Seismic Hazard Model
Simplifying complex fault data for systems-level analysis: Earthquake geology inputs for U.S. NSHM 2023
How similar was the 1983 Mw 6.9 Borah Peak earthquake rupture to its surface-faulting predecessors along the northern Lost River fault zone (Idaho, USA)?
STEPS: Slip time earthquake path simulations applied to the San Andreas and Toe Jam Hill Faults to redefine geologic slip rate uncertainty
Non-USGS Publications**
**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.