Annemarie Baltay

Full name: Annemarie Baltay Sundstrom


I study how physical measures of earthquakes and the earth control ground motions measured at distance, and how ground motion observations can be used to gain insight on the earthquake source and path. I am particularly interested in earthquake stress drop: how it is measured, what is the variability, and how that all relates to ground motion data and models. I am also focused on physical components and uncertainty of ground-motion prediction equations (GMPEs), a critical building block in hazard maps. Reducing the variability and uncertainty in GMPEs is imperative to building better hazard maps, as well as for performing more accurate site-specific hazard studies for critical facilities. Currently, I am working towards physical explanations for variability in the source, site, and path components in ground motions. Ultimately we will develop models for predicting those effects from geophysical observables, such as stress drop (for source), site velocity profiles and attenuation (for site), and whole-path attenuation (for path). I am also involved in the USGS-led ShakeAlert earthquake early warning project, which aims to alert the U.S. West coast for earthquake ground motion before it arrives at a user's location; as part of that project, I work on the best ways to model ground motion and associated uncertainty in early warning, as well as chair the Ground Motion Working Group and collaborate on the PLUM algorithm development. 



2011                      Ph.D. Geophysics, Department of Geophysics, Stanford University

2008                      M.S. Geophysics, Department of Geophysics, Stanford University

2005                      B.A. Applied Mathematics, Yale University


2015 - present      Research Geophysicist, U.S. Geological Survey, Moffett Field, Mountain View, CA

2013 - 2015          Mendenhall Postdoctoral Scholar, U.S. Geological Survey, Menlo Park

2012                      Postdoctoral Scholar, Department of Geophysics, Stanford University

2012                      Instructor, Understanding Natural Hazards, Quantifying Risk and Increasing Resilience in Highly Urbanized                                                 Regions, Department of Geology, Stanford University

2010                      Summer Intern for Europe Earthquake Model Development, Risk Management Solutions, Newark, CA

2009                      Graduate Student Researcher through NSF EAPSI, Department of Earth and Planetary Sciences, University of Tokyo

Honors and Activities

2019                      Presidential Early Career Award for Scientists and Engineers (PECASE)

2018                      Charles F. Richter Early Career Award, Seismological Society of America

2017 - present       CISN ShakeMap Data/Integration Working Group

2016 - present       Co-leader, Southern California Earthquake Center Planning Committee, Ground Motion focus group 

2020 - present       Board of Directors, Seismological Society of America