Acknowledgements
We gratefully acknowledge the ideas and discussion from participants during the U.S. Geological Survey John Wesley Powell Center for Analysis and Synthesis working group on Tsunami Source Standardization for Hazards Mitigation in the United States meeting in 2018 on Alaska Aleutian subduction zone tsunami sources, in coordination with the National Tsunami Hazards Mitigation Program (NTHMP), led by Stephanie L. Ross (USGS Pacific Coastal and Marine Science Center) and core group members Marie Eble (National Oceanic and Atmospheric Administration), Pat Lynett (University of Southern California), Dmitry J. Nicolsky (University of Alaska Fairbanks), Kenny Ryan (Air Force Research Laboratory), Hong Kie Thio (AECOM), and Rick Wilson (California Geological Survey). We thank Julie Elliott (Michigan State University) for discussions regarding geodetic data and models. We thank Harvey Kelsey, Alex Hatem, two anonymous reviewers, and Associate Editor Natalia Ruppert for their helpful suggestions. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.