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Brad T. Aagaard

Geologic Hazards Science Center
United States Geological Survey
Research Geophysicist

Expertise: strong ground motion, source mechanics, wave propagation
 
 
About Me Publications
Aagaard, B. T., Knepley, M. G., & Williams, C. A. (2024, 09). Effect of spatial discretization order in fault slip inversions. Poster Presentation at 2024 SCEC Annual Meeting. SCEC Contribution 13704
Petersen, M. D., Shumway, A. M., Powers, P. M., Field, E. H., Moschetti, M. P., Jaiswal, K. S., Milner, K. R., Rezaeian, S., Frankel, A., Llenos, A. L., Michael, A. J., Altekruse, J., Ahdi, S. K., Withers, K. B., Mueller, C. S., Zeng, Y., Chase, R., Salditch, L., Luco, N., Rukstales, K. S., Herrick, J. A., Girot, D. L., Aagaard, B. T., Bender, A. M., Blanpied, M. L., Briggs, R., Boyd, O. S., Clayton, B. S., DuRoss, C. B., Evans, E. L., Haeussler, P., Hatem, A., Haynie, K. L., Hearn, E. H., Johnson, K. M., Kortum, Z. A., Kwong, N. S., Makdisi, A. J., Mason, B., McNamara, D., McPhillips, D., Okubo, P., Page, M. T., Pollitz, F. F., Rubinstein, J. L., Shaw, B. E., Shen, Z., Shiro, B., Smith, J. A., Stephenson, W. J., Thompson, E. M., Thompson Jobe, J. A., Wirth, E., & Witter, R. C. (2023). The 2023 US 50-State National Seismic Hazard Model: Overview and implications. Earthquake Spectra,. doi: 10.1177/87552930231215428. SCEC Contribution 13391
Ahdi, S. K., Aagaard, B. T., Moschetti, M. P., Boyd, O. S., Parker, G. A., & Stephenson, W. J. (2023, 09). Empirical Assessment of Site and Basin Response in the Pacific Northwest via Testing Site-Response Models for Different Tectonic Regimes. Poster Presentation at 2023 SCEC Annual Meeting. SCEC Contribution 13238
Moschetti, M. P., Thompson, E. M., Peterson, R., Engler, D., Smith, J. A., Aagaard, B. T., & Boyd, O. S. (2023, 09). Development of a partially nonergodic ground-motion model for Fourier amplitude spectra for the San Francisco Bay Area, California . Poster Presentation at 2023 SCEC Annual Meeting. SCEC Contribution 13225
Hirakawa, E. T., & Aagaard, B. T. (2023, 09). Evaluation and Updates for the USGS San Francisco Bay region 3D seismic velocity model (SF-CVM) with focus on shallow sediments in the Central Bay Block. Poster Presentation at 2023 SCEC Annual Meeting. SCEC Contribution 13145
Aagaard, B. T., Knepley, M. G., Williams, C. A., & Walker, R. L. (2023, 09). Ongoing development of PyLith version 3: New features, additional examples, and current priorities . Poster Presentation at 2023 SCEC Annual Meeting. SCEC Contribution 12810
Nevitt, J. M., Brooks, B. A., Hardebeck, J. L., & Aagaard, B. T. (2022, 09). Geologic inheritance of the 2019 M7.1 Ridgecrest earthquake source faults and the resulting slip distribution. Poster Presentation at 2022 SCEC Annual Meeting. SCEC Contribution 12492
Ahdi, S. K., Moschetti, M. P., Aagaard, B. T., Boyd, O. S., Parker, G. A., & Stephenson, W. J. (2022, 09). Assessment of Western U.S. Empirical Basin Response for the 2023 Update of the National Seismic Hazard Model . Poster Presentation at 2022 SCEC Annual Meeting. SCEC Contribution 12483
Walker, R. L., Aagaard, B. T., Knepley, M. G., & Williams, C. A. (2021, 08). Implementing and Benchmarking Poroelasticity in PyLith. Poster Presentation at 2021 SCEC Annual Meeting. SCEC Contribution 11371
Hirakawa, E. T., & Aagaard, B. T. (2021, 08). Updates for San Francisco Bay Sediments in the USGS SF-CVM and Simulation of Long-Duration Shaking in the East Bay Plain. Poster Presentation at 2021 SCEC Annual Meeting. SCEC Contribution 11326
Aagaard, B. T., & Hirakawa, E. T. (2021, 08). The USGS San Francisco Bay region 3D seismic velocity model (SF-CVM) version 21.1.0: Updates for the East and North Bay and a new storage scheme for 3D Earth models. Poster Presentation at 2021 SCEC Annual Meeting. SCEC Contribution 11252
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
Nevitt, J. M., Brooks, B. A., Hardebeck, J. L., & Aagaard, B. T. (2020, 08). Slip distribution controlled by inherited fault geometry during the 2019 M7.1 Ridgecrest earthquake. Poster Presentation at 2020 SCEC Annual Meeting. SCEC Contribution 10550
Aagaard, B. T. (2020, 08). Geomodelgrids: A storage scheme and API for multiscale Earth models. Poster Presentation at 2020 SCEC Annual Meeting. SCEC Contribution 10352
Hirakawa, E. T., & Aagaard, B. T. (2020, 08). Updating the USGS San Francisco Bay Area 3D Seismic Velocity Model: Special Focus on the North Bay. Poster Presentation at 2020 SCEC Annual Meeting. SCEC Contribution 10291
Thompson, E. M., Hearne, M., Rekoske, J., Schovanec, H., Moschetti, M. P., Aagaard, B. T., & Parker, G. A. (2019, 08). Automated processing of the 2019 Ridgecrest, California, earthquake sequence ground motions. Poster Presentation at 2019 SCEC Annual Meeting. SCEC Contribution 9838
Hirakawa, E. T., & Aagaard, B. T. (2019, 08). Evaluation and Adjustments of the USGS San Francisco Bay Area Velocity Model: Special Focus on the East Bay. Poster Presentation at 2019 SCEC Annual Meeting. SCEC Contribution 9775
Callaghan, S., Maechling, P. J., Goulet, C. A., Milner, K. R., Su, M., Graves, R. W., Olsen, K. B., Cui, Y., Aagaard, B. T., Wooddell, K. E., Kottke, A. R., Shaw, B. E., & Jordan, T. H. (2019, 08). New Advances in CyberShake PSHA Models. Poster Presentation at 2019 SCEC Annual Meeting. SCEC Contribution 9717
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
Callaghan, S., Maechling, P. J., Goulet, C. A., Milner, K. R., Su, M., Graves, R. W., Olsen, K. B., Aagaard, B. T., Wooddell, K. E., Kottke, A. R., Jordan, T. H., & Vidale, J. E. (2018, 08). A SCEC CyberShake Physics-Based Probabilistic Seismic Hazard Model for Northern California. Poster Presentation at 2018 SCEC Annual Meeting. SCEC Contribution 8752
Aagaard, B. T. (2018, 08). Earth Science Research Needs for Improving Earthquake Scenarios. Oral Presentation at 2018 SCEC Annual Meeting. SCEC Contribution 8554
Harris, R. A., Barall, M., Aagaard, B., Ma, S., Roten, D., Olsen, K., Duan, B., Luo, B., Liu, D., Bai, K., Ampuero, J., Kaneko, Y., Gabriel, A., Duru, K., Ulrich, T., Wollherr, S., Shi, Z., Dunham, E., Bydlon, S., Zhang, Z., Chen, X., Somala, S., Pelties, C., Tago, J., Cruz-Atienza, V., Kozdon, J., Daub, E., Aslam, K., Kase, Y., Withers, K., & Dalguer, L. (2018). A suite of exercises for verifying dynamic earthquake rupture codes. Seismological Research Letters, 89(3), 1146-1162. doi: 10.1785/0220170222. SCEC Contribution 7960
Aagaard, B. T., Williams, C. A., & Knepley, M. G. (2016, 08). Flexible implementation of multiphysics and discretizations in PyLith crustal deformation modeling software. Poster Presentation at 2016 SCEC Annual Meeting. SCEC Contribution 6927
Aagaard, B. T., Knepley, M. G., & Williams, C. A. (2013). A Domain Decomposition Approach to Implementing Fault Slip in Finite-Element Models of Quasi-static and Dynamic Crustal Deformation. Journal of Geophysical Research: Solid Earth, 118(6), 3059–3079. doi: 10.1002/jgrb.50217. SCEC Contribution 1665
Harris, R. A., Barall, M., Andrews, D. J., Duan, B., Ma, S., Dunham, E. M., Gabriel, A., Kaneko, Y., Kase, Y., Aagaard, B. T., Oglesby, D. D., Ampuero, J., Hanks, T. C., & Abrahamson, N. A. (2011). Verifying a computational method for predicting extreme ground motion. Seismological Research Letters, 82(5), 638-644. doi: 10.1785/gssrl.82.5.638. SCEC Contribution 1473
Graves, R. W., & Aagaard, B. T. (2011). Testing Long-Period Ground-Motion Simulations of Scenario Earthquakes using the Mw 7.2 El Mayor-Cucapah Mainshock: Evaluation of Finite-Fault Rupture Characterization and 3D Seismic Velocity Models. Bulletin of the Seismological Society of America, 101(2), 895-907. doi: 10.1785/0120100233. SCEC Contribution 1457
Graves, R. W., Aagaard, B. T., & Hudnut, K. W. (2011). The ShakeOut Earthquake Source and Ground Motion Simulations. Earthquake Spectra, 27(2), 273-291. doi: 10.1193/1.3570677. SCEC Contribution 1427
Aagaard, B. T., Graves, R. W., Rodgers, A. J., Brocher, T. M., Simpson, R. W., Dreger, D. S., Petersson, A., Larsen, S., Ma, S., & Jachens, R. C. (2010). Ground-motion modeling of Hayward fault scenario earthquakes II: Simulation of long-period and broadband ground motions. Bulletin of the Seismological Society of America, 100(6), 2945-2977. doi: 10.1785/0120090379. SCEC Contribution 1425
Aagaard, B. T., Graves, R. W., Schwartz, D., Ponce, D. A., & Graymer, R. W. (2010). Ground-motion modeling of Hayward fault scenario earthquakes I: Construction of the suite of scenarios. Bulletin of the Seismological Society of America, 100(6), 2927-2944. doi: 10.1785/0120090324. SCEC Contribution 1309
Harris, R. A., Barall, M., Archuleta, R. J., Dunham, E. M., Aagaard, B. T., Ampuero, J., Bhat, H. S., Cruz-Atienza, V. M., Dalguer, L. A., Dawson, P. B., Day, S. M., Duan, B., Ely, G. P., Kaneko, Y., Kase, Y., Lapusta, N., Liu, Y., Ma, S., Oglesby, D. D., Olsen, K. B., Pitarka, A., Song, S., & Templeton, E. L. (2009). The SCEC/USGS Dynamic Earthquake Rupture Code Verification Exercise. Seismological Research Letters, 80(January/February 2009), 119-126. doi: 10.1785/gssrl.80.1.119. SCEC Contribution 1184
Graves, R. W., Aagaard, B. T., Hudnut, K. W., Star, L. M., Stewart, J. P., & Jordan, T. H. (2008). Broadband Simulations for Mw 7.8 Southern San Andreas Earthquakes: Ground Motion Sensitivity to Rupture Speed. Geophysical Research Letters, 35(22). doi: 10.1029/2008GL035750. SCEC Contribution 1238
Olsen, A. H., Aagaard, B. T., & Heaton, T. H. (2008). Long-Period Building Response to Earthquakes in the San Francisco Bay Area. Bulletin of the Seismological Society of America, 98(2), 1047-1065. doi: 10.1785/0120060408. SCEC Contribution 1135
Bakun, W., Aagaard, B. T., Dost, B., Ellsworth, W. L., Hardebeck, J. L., Harris, R. A., Ji, C., Johnston, M., Langbein, J. O., Lienkaemper, J. J., Michael, A. J., Murray, J. R., Nadeau, R. M., Reichle, M., Reasenberg, P., Roeloffs, E., Shakal, A., Simpson, R. W., & Waldhauser, F. (2005). Implications for prediction and hazard assessment from the 2004 Parkfield earthquake. Nature, 437(13 October 2005), 969-974. doi: 10.1038/nature04067. SCEC Contribution 920

Last updated Sep 19, 2024.