Annemarie S. Baltay
USGS Earthquake Science Center
Research Geophysicist
Expertise: Earthquake Seismology; Earthquake Ground Motion
About Me
Publications
Annemarie Baltay is an observational seismologist with the USGS in Moffett Field who researches earthquake ground motions. She is interested in how earthquake source physics and earth materials/structure control ground motions measured at distances from an earthquake, and how we use observations of ground motion to infer information about the physics of the earth. She is also involved in the development of the USGS led ShakeAlert earthquake early warning project to alerts the U.S. West coast for earthquake ground motion before it arrives at a user's location. Annemarie received her PhD in Geophysics from Stanford before becoming a Mendenhall Postdoctoral Scholar at the USGS. While conducting cutting edge research, she also enjoys being in the extremely collaborative environment of the USGS.
SCEC Intern (2004)
SCEC Participation
Current Roles
SCEC Science Planning Committee, Group Co-Leader (2016 - Present)Past Roles
SCEC Mentor (2020)SCEC Intern (2004)
Chu, S., Baltay, A. S., & Abercrombie, R. E. (2023, 09). The effect of azimuthal variation on measured stress drop: a case study of the 2019 Ridgecrest sequence. Poster Presentation at 2023 SCEC Annual Meeting. SCEC Contribution 13285
Clements, T., Cochran, E. S., Baltay, A. S., Minson, S. E., & Yoon, C. (2023, 09). Performance of the GRAPES EEW Algorithm on the 2019 M7.1 Ridgecrest Earthquake. Poster Presentation at 2023 SCEC Annual Meeting. SCEC Contribution 13071
Parker, G. A., Baltay, A. S., & Hirakawa, E. T. (2023, 09). An Empirical Green’s Function Type Approach for Isolating Directivity Effects in Ground Motion Residuals: Examples from the 2022 Alum Rock and 2004 Parkfield Earthquakes. Poster Presentation at 2023 SCEC Annual Meeting. SCEC Contribution 13055
Saunders, J. K., Cochran, E. S., Bunn, J. J., Baltay, A. S., Minson, S. E., & O'Rourke, C. T. (2023, 09). Incorporating intensity distance attenuation into PLUM ground-motion-based earthquake early warning in the United States: The APPLES configuration. Poster Presentation at 2023 SCEC Annual Meeting. SCEC Contribution 12957
Abercrombie, R. E., Baltay, A. S., Chu, S., & Taira, T. (2023, 09). Update on the International SCEC/USGS Community Stress Drop Validation Study. Poster Presentation at 2023 SCEC Annual Meeting. SCEC Contribution 12929
Chu, S., Baltay, A. S., Tsai, V. C., Abercrombie, R. E., Hirth, G., & Trugman, D. (2022, 09). How is fault complexity linked to high-frequency radiation from Southern California earthquakes? . Poster Presentation at 2022 SCEC Annual Meeting. SCEC Contribution 12251
Saunders, J. K., Baltay, A. S., Böse, M., & Minson, S. E. (2022, 09). Uncertainty in Ground-Motion-to-Intensity Conversions Significantly Affects Earthquake Early Warning Alert Regions. Poster Presentation at 2022 SCEC Annual Meeting. SCEC Contribution 12161
Clements, T., Cochran, E. S., Minson, S. E., Baltay, A. S., & Yoon, C. (2022, 09). Earthquake Early Warning with Graph Learning. Poster Presentation at 2022 SCEC Annual Meeting. SCEC Contribution 12131
Chaffeur, J. M., Minson, S. E., Saunders, J. K., Baltay, A. S., Hough, S. E., Cochran, E. S., McBride, S. K., Quitoriano, V., & Blair, L. (2022, 09). Which earthquakes are the most damaging? An examination of community-collected ‘Did You Feel It’ data in California, USA. Poster Presentation at 2022 SCEC Annual Meeting. SCEC Contribution 12122
Baltay, A. S., Chu, S., Abercrombie, R. E., & Taira, T. (2022, 09). The SCEC/USGS Community Stress Drop Validation TAG using the 2019 Ridgecrest Earthquake Sequence Data. Poster Presentation at 2022 SCEC Annual Meeting. SCEC Contribution 12049
Cochran, E. S., Saunders, J. K., Baltay, A. S., Bunn, J., Clements, T., Kilb, D., Minson, S. E., O'Rourke, C., & Yoon, C. (2022, 09). Real-time performance and new developments of the Propagation of Local Undamped Motion (PLUM) earthquake early warning algorithm for the West Coast, U.S.A.. Poster Presentation at 2022 SCEC Annual Meeting. SCEC Contribution 11896
Parker, G. A., & Baltay, A. S. (2021, 08). The Effect of Earthquake Depth on Ground Motion Predictions for Earthquake Early Warning Alerting . Poster Presentation at 2021 SCEC Annual Meeting. SCEC Contribution 11521
Cochran, E. S., Saunders, J. K., Minson, S. E., Bunn, J., Kilb, D., Baltay, A. S., O'Rourke, C., Hoshiba, M., & Kodera, Y. (2021, 08). Optimizing alerts by tuning the PLUM prediction radius for the ShakeAlert System. Poster Presentation at 2021 SCEC Annual Meeting. SCEC Contribution 11385
Saunders, J. K., Minson, S. E., Cochran, E. S., Bunn, J., Baltay, A. S., Kilb, D., & O'Rourke, C. (2021, 08). A Twist of PLUM: Low-Magnitude Earthquakes and Ground-Motion-Based Early Warning. Poster Presentation at 2021 SCEC Annual Meeting. SCEC Contribution 11360
Devin, E. G., Parker, G. A., Baltay, A. S., Nye, T., & Sahakian, V. J. (2021, 08). Stress Drop in Ridgecrest Sequence Events from the Generalized Inversion Technique. Poster Presentation at 2021 SCEC Annual Meeting. SCEC Contribution 11311
Baltay, A. S., Abercrombie, R. E., & Taira, T. (2021, 08). Introduction to the SCEC Community Stress Drop Validation Study TAG. Poster Presentation at 2021 SCEC Annual Meeting. SCEC Contribution 11308
Rosas, V. G., & Baltay, A. S. (2020, 08). Analyzing Stress drops and other earthquake parameters from the 2019 Ridgecrest Earthquake Sequence. Poster Presentation at 2020 SCEC Annual Meeting. SCEC Contribution 10738
Baltay, A. S., & Abercrombie, R. E. (2020, 08). Stress drop and ground-motion source comparison of the July 2019 Ridgecrest earthquake sequence: A community validation study . Poster Presentation at 2020 SCEC Annual Meeting. SCEC Contribution 10673
Saunders, J. K., Aagaard, B. T., Baltay, A. S., & Minson, S. E. (2020, 08). Incorporating ground-motion uncertainties into earthquake early warning alert distance strategies using the July 2019 M6.4 and M7.1 Ridgecrest, California, earthquakes. Poster Presentation at 2020 SCEC Annual Meeting. SCEC Contribution 10596
Kilb, D., Bunn, J., Saunders, J. K., Cochran, E. S., Minson, S. E., Baltay, A. S., & O'Rourke, C. (2020, 08). The Plum Earthquake Early Warning Algorithm: A Case Study of Two West Coast, USA, Datasets. Poster Presentation at 2020 SCEC Annual Meeting. SCEC Contribution 10305
Parker, G. A., & Baltay, A. S. (2020, 07). Empirical Map-Based Models of Nonergodic Site Response in the Greater Los Angeles Area. Poster Presentation at 2020 SCEC Annual Meeting. SCEC Contribution 10215
Farghal, N., & Baltay, A. S. (2019, 08). Strain-estimated ground motions of recent earthquakes in California. Poster Presentation at 2019 SCEC Annual Meeting. SCEC Contribution 9795
King, E., Klimasewski, A., Sahakian, V. J., & Baltay, A. S. (2019, 08). Source and Site Spectral Inversion for κ0 Computation in the Bay Area. Poster Presentation at 2019 SCEC Annual Meeting. SCEC Contribution 9727
Saunders, J. K., Aagaard, B. T., Baltay, A. S., & Minson, S. E. (2019, 08). Implications of uncertainty in ground motion estimates on ShakeAlert alerting strategies: Considering the 2019 Ridgecrest earthquake sequence. Poster Presentation at 2019 SCEC Annual Meeting. SCEC Contribution 9611
Aagaard, B. T., Minson, S. E., Baltay, A. S., Cochran, E. S., & Hanks, T. C. (2019, 08). ShakeAlert Earthquake Early Warning Performance for the 2019 Ridgecrest Sequence. Poster Presentation at 2019 SCEC Annual Meeting. SCEC Contribution 9605
Parker, G. A., Baltay, A. S., Thompson, E. M., Rekoske, J., & McNamara, D. (2019, 08). Source, Site and Path Characterization of the July 2019 M7.1 and M6.4 Ridgecrest Earthquake Sequence. Poster Presentation at 2019 SCEC Annual Meeting. SCEC Contribution 9458
Cochran, E. S., Kilb, D., Bunn, J., Minson, S. E., Baltay, A. S., Hoshiba, M., & Kodera, Y. (2019, 08). Retrospective and real-time event-based performance of the PLUM earthquake early warning algorithm for the West Coast, USA. Poster Presentation at 2019 SCEC Annual Meeting. SCEC Contribution 9432
Kilb, D., Johnson, C. W., Baltay, A. S., & Vernon, F. L. (2019, 08). On the Variability of Earthquake Ground Motion from the Sage Brush Flats High Density Array in Southern California . Poster Presentation at 2019 SCEC Annual Meeting. SCEC Contribution 9386
Baltay, A. S., Ellsworth, W. L., Schoenball, M., & Beroza, G. C. (2017, 08). Proposed Community Stress Drop Validation Experiment. Poster Presentation at 2017 SCEC Annual Meeting. SCEC Contribution 7797
Minson, S. E., Baltay, A. S., Cochran, E. S., Hanks, T. C., & Meier, M. (2017, 08). The Limits of Earthquake Early Warning. Oral Presentation at 2017 SCEC Annual Meeting. SCEC Contribution 7607
Sahakian, V. J., Baltay, A. S., Hanks, T. C., Buehler, J., & Vernon, F. L. (2017, 07). Path and site effects in GMPEs: Incorporating crustal physical properties for region-specific ground motion estimation using small magnitude data from Southern California. Poster Presentation at 2017 SCEC Annual Meeting. SCEC Contribution 7367
Sahakian, V. J., Baltay, A. S., & Hanks, T. C. (2016, 08). Reducing Uncertainty in Ground Motion Prediction Equations by Understanding Path Effects. Poster Presentation at 2016 SCEC Annual Meeting. SCEC Contribution 6441
Barbour, A. J., & Baltay, A. S. (2016, 07). Ground Strains in Southern California from Earthquakes on the San Jacinto Fault. Poster Presentation at 2016 SCEC Annual Meeting. SCEC Contribution 6369
Baltay, A. S., Abercrombie, R. E., & Taira, T. (2021, 04). A Community Stress Drop Validation Study using the 2019 Ridgecrest Earthquake Dataset. Poster Presentation at 2021 Virtual SSA Annual Meeting, April 19 - 23. SCEC Contribution 11825
Baltay, A. S., Abercrombie, R. E., & Taira, T. (2021, 10). Introduction to the SCEC Community Stress Drop Validation Study. Oral Presentation at 2021 Virtual SSJ Annual Meeting, 14-16 October. SCEC Contribution 11823
Taira, T., Abercrombie, R. E., & Baltay, A. S. (2021, 12). Introduction to the SCEC Community Stress Drop Validation Study. Poster Presentation at 2021 AGU Fall Meeting, 13 – 17 December. SCEC Contribution 11821
Baltay, A. S., & Beroza, G. C. (2013). Ground motion prediction from tremor. Geophysical Research Letters, 40(24), 6340-6345. doi: 10.1002/2013GL058506. SCEC Contribution 1795
Baltay, A. S., Beroza, G. C., & Hanks, T. C. (2013). Stable Stress Drop Measurements and their Variability: Implications for Ground-Motion Prediction. Bulletin of the Seismological Society of America, 103(1). doi: 10.1785/0120120161. SCEC Contribution 1519
Baltay, A. S., Ide, S., Prieto, G. A., & Beroza, G. C. (2010). Energetic and Enervated Earthquakes. Geophysical Research Letters,. SCEC Contribution 1462
Baltay, A. S., Prieto, G. A., & Beroza, G. C. (2010). Radiated seismic energy from coda measurements and no scaling in apparent stress with seismic moment. Journal of Geophysical Research, 115(B08314). doi: 10.1029/2009JB006736. SCEC Contribution 1287
Last updated Sep 20, 2023.
