Scott Callaghan
Statewide California Earthquake Center
University of Southern California
University of Southern California
Computer Scientist
Expertise: high performance computing, scientific workflows, probabilistic seismic hazard analysis
About Me
Publications
Scott Callaghan is a computer scientist at the Southern California Earthquake Center. He is the lead developer on the CyberShake project, a large-scale high performance computing application which performs physics-based probabilistic hazard analysis for California, producing seismograms and ground motion estimates used by the SCEC and engineering communities. He also works with scientific workflows in high performance and high throughput environments. Additionally, he has an interest in education, outreach, and mentoring to prepare the next generation of high performance computing professionals.
Scott has worked in the high performance computing field for over 10 years. He has been a member of the SCEC community since becoming a UseIT undergraduate intern in 2003. He obtained his B.S. in Computer Science from the University of Southern California in 2004, and his M.S. in Computer Science (High Performance Computing) from the University of Southern California in 2007.
SCEC Research Collaborator (2005 - 2007)
SCEC Intern (2004)
Scott has worked in the high performance computing field for over 10 years. He has been a member of the SCEC community since becoming a UseIT undergraduate intern in 2003. He obtained his B.S. in Computer Science from the University of Southern California in 2004, and his M.S. in Computer Science (High Performance Computing) from the University of Southern California in 2007.
SCEC Participation
Current Roles
SCEC Staff (2008 - Present)Past Roles
SCEC Mentor (2020)SCEC Research Collaborator (2005 - 2007)
SCEC Intern (2004)
Callaghan, S., Maechling, P. J., Silva, F., Goulet, C. A., Milner, K. R., Su, M., Meng, X., Pinilla Ramos, C., Olsen, K. B., Graves, R. W., Abrahamson, N. A., Kottke, A. R., Vahi, K., Deelman, E., Jordan, T. H., & Ben-Zion, Y. (2024, 09). Updates to CyberShake Physics-Based PSHA for Northern California. Poster Presentation at 2024 SCEC Annual Meeting. SCEC Contribution 13798
Kratzer, A., Milner, K. R., & Callaghan, S. (2024, 09). Interpolation Methods for CyberShake Seismic Hazard Analysis Data Products. Poster Presentation at 2024 SCEC Annual Meeting. SCEC Contribution 13689
Callaghan, S., Gonsiorowski, E., Filinger, W., & Zhukov, I. (2024, 03). Developing a successful HPC mentoring program. Oral Presentation at PEARC '24. SCEC Contribution 13411
Lee, Y., Goulet, C. A., Hu, Z., & Callaghan, S. (2023, 09). Evaluation of the Impacts on Risk Assessments for Distributed Infrastructure Systems from Ground Motion Median, Variability, and Spatial Correlation in CyberShake Simulations. Poster Presentation at 2023 SCEC Annual Meeting. SCEC Contribution 13298
Callaghan, S., Maechling, P. J., Silva, F., Milner, K. R., Olsen, K. B., Graves, R. W., Goulet, C. A., Vahi, K., Deelman, E., Kottke, A. R., Cui, Y., Jordan, T. H., & Ben-Zion, Y. (2023, 09). Recent Enhancements to the CyberShake PSHA Platform. Poster Presentation at 2023 SCEC Annual Meeting. SCEC Contribution 13216
Cui, Y., Roten, D., Palla, A., Govind, A., Callaghan, S., Norman, M., Koesterke, L., Zhang, W., & Maechling, P. J. (2023, 09). Progress of porting AWP-ODC to next generation HPC architectures and a 4-Hz Iwan-type nonlinear dynamic simulation of the ShakeOut scenario on TACC Frontera. Poster Presentation at 2023 SCEC Annual Meeting. SCEC Contribution 13183
Shaw, B. E., Milner, K. R., Callaghan, S., Goulet, C. A., & Silva, F. (2023, 09). Deterministic ground motions from an earthquake simulator consistent with NGA-West2 ground motion models. Poster Presentation at 2023 SCEC Annual Meeting. SCEC Contribution 13014
Denolle, M. A., Gabriel, A., Wang, Y., Ni, Y., Yuan, C., Iturrieta, P. C., Bayona, J. A., Silva, F., Su, M., Maechling, P. J., Callaghan, S., Fatland, R., Alterman, N., Wolf, S., Schliwa, N., May, D. A., Wang, C., Tape, C., & Chow, B. (2023, 09). High-Performance Seismology CyberTraining (HPS) 2023: Data Science and HPC. Poster Presentation at 2023 SCEC Annual Meeting. SCEC Contribution 12843
Maechling, P. J., Callaghan, S., Milner, K. R., Pauk, E., Savran, W. H., Silva, F., & Su, M. (2022, 09). Improving the Sustainability of SCEC Scientific Software using Software Best Practices. Poster Presentation at 2022 SCEC Annual Meeting. SCEC Contribution 12576
Su, M., Maechling, P. J., Callaghan, S., Plesch, A., & Shaw, J. H. (2022, 09). Integration of Standalone CVM-H Basin Models into the Unified Community Velocity model(UCVM) Software. Poster Presentation at 2022 SCEC Annual Meeting. SCEC Contribution 12567
Callaghan, S., Maechling, P. J., Silva, F., Goulet, C. A., Milner, K. R., Shaw, B. E., Olsen, K. B., Yeh, T., Graves, R. W., Vahi, K., Deelman, E., Kottke, A. R., Jordan, T. H., & Ben-Zion, Y. (2022, 09). Updates to the CyberShake PSHA Platform. Poster Presentation at 2022 SCEC Annual Meeting. SCEC Contribution 12504
Lee, Y., Goulet, C. A., Hu, Z., Milner, K. R., & Callaghan, S. (2022, 09). Impact of CyberShake on Risk Assessments for Distributed Infrastructure Systems. Poster Presentation at 2022 SCEC Annual Meeting. SCEC Contribution 12487
Cui, Y., Callaghan, S., Ren, Y., Koesterke, L., Zhang, W., Norman, M., Roten, D., Maechling, P. J., & Goulet, C. A. (2022, 09). Porting AWP-ODC to next generation architectures: the Characteristic Scientific Application project. Poster Presentation at 2022 SCEC Annual Meeting. SCEC Contribution 12322
Lee, Y., Goulet, C., Hu, Z., Milner, K. R., Callaghan, S., & Eguchi, R. T. (2021, 08). Impacts of CyberShake on Risk Assessments for Distributed Infrastructure Systems. Poster Presentation at 2021 SCEC Annual Meeting. SCEC Contribution 11438
Callaghan, S., Goulet, C. A., Silva, F., Maechling, P. J., Graves, R. W., O'Reilly, O., Olsen, K. B., Yeh, T., Kottke, A. R., & Ben-Zion, Y. (2021, 08). Verification of the broadband CyberShake platform. Poster Presentation at 2021 SCEC Annual Meeting. SCEC Contribution 11384
Meng, X., Goulet, C. A., Milner, K. R., & Callaghan, S. (2021, 08). A Nonergodic Ground Motion Model in Southern California with Spatially Varying Coefficients Using a SCEC CyberShake Dataset. Poster Presentation at 2021 SCEC Annual Meeting. SCEC Contribution 11358
Meng, X., Goulet, C. A., Milner, K. R., & Callaghan, S. (2020, 08). A Nonergodic Ground Motion Model in Southern California with Spatially Varying Coefficients Using a SCEC CyberShake Dataset. Poster Presentation at 2020 SCEC Annual Meeting. SCEC Contribution 10505
Callaghan, S., Maechling, P. J., Goulet, C. A., Milner, K. R., Graves, R. W., Olsen, K. B., Silva, F., & Ben-Zion, Y. (2020, 08). Enhancing CyberShake simulations for engineering applications. Poster Presentation at 2020 SCEC Annual Meeting. SCEC Contribution 10463
Locsin, L., & Callaghan, S. (2020, 08). Software Containers and Version Control for High Performance Computing Applications. Poster Presentation at 2020 SCEC Annual Meeting. SCEC Contribution 10267
Moschetti, M. P., Thompson, E. M., Luco, N., Jordan, T. H., Powers, P. M., Shumway, A. M., Petersen, M. D., Graves, R. W., Callaghan, S., Goulet, C. A., Milner, K. R., Maechling, P. J., Wang, F., & Rekoske, J. (2019, 08). An empirical- and simulation-based ground-motion model for Southern California. Poster Presentation at 2019 SCEC Annual Meeting. SCEC Contribution 9820
Crouse, C., Goulet, C. A., Jordan, T. H., Milner, K. R., Pauk, E., Callaghan, S., & Graves, R. W. (2019, 08). Simulation-Informed Site-Specific Design Spectra for Engineers: New Beta Version Including ASCE 7-16, ASCE 41-17 and LATBSDC Standards. Poster Presentation at 2019 SCEC Annual Meeting. SCEC Contribution 9759
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
Meng, X., Goulet, C. A., Milner, K. R., & Callaghan, S. (2019, 08). Fully Nonergodic Ground Motion Models in Central California Using NGA-West2 and SCEC CyberShake Datasets. Poster Presentation at 2019 SCEC Annual Meeting. SCEC Contribution 9597
Li Wu, R., Mondragon, G., Tang, T., Davey, L., Carpio, V. Y., Teca, A. F., Lazerson, M. A., Swiatlowski, J. L., Milner, K. R., Callaghan, S., & Jordan, T. H. (2019, 08). 30 Year Forecast for the Current California Earthquake Drought. Poster Presentation at 2019 SCEC Annual Meeting. SCEC Contribution 9312
Pauk, E., Huynh, T. T., Milner, K. R., Callaghan, S., Gill, D., Goulet, C. A., & Crouse, C. (2018, 08). Developing Software to Support SCEC Research Collaborations and Data Dissemination: A Case Study of the Committee for the Utilization of Ground Motion Simulations (UGMS) Project. Poster Presentation at 2018 SCEC Annual Meeting. SCEC Contribution 8775
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
Milner, K. R., Shaw, B. E., Jordan, T. H., Callaghan, S., & Goulet, C. A. (2018, 08). Fully physics-based PSHA: coupling RSQSim with deterministic ground motion simulations. Poster Presentation at 2018 SCEC Annual Meeting. SCEC Contribution 8683
Meng, X., Goulet, C. A., Milner, K. R., & Callaghan, S. (2018, 08). Preliminary Results on Fully Nonergodic Ground Motion Models in Central California Using NGA-West2 and SCEC CyberShake Datasets. Poster Presentation at 2018 SCEC Annual Meeting. SCEC Contribution 8612
Maechling, P. J., Bielak, J., Callaghan, S., Cui, Y., Field, E. H., Goulet, C. A., Graves, R. W., Jordan, T. H., Milner, K. R., Olsen, K. B., Roten, D., Savran, W. H., Silva, F., Su, M., Taborda, R., & Vidale, J. E. (2018, 08). The SCEC Software Ecosystem for Earthquake System Science Research. Poster Presentation at 2018 SCEC Annual Meeting. SCEC Contribution 8582
Kababjyan, V., Panchigar, S. P., Lopez, A. G., Mizutani, T., Guerra, A. A., Callaghan, S., Gilchrist, J. J., Pearson, J. K., Noriega, G. R., & Jordan, T. H. (2018, 08). Simulating Millions of Years of Earthquakes in California using HPC. Poster Presentation at 2018 SCEC Annual Meeting. SCEC Contribution 8250
Maechling, P. J., Gill, D., Taborda, R., Shaw, J. H., Plesch, A., Olsen, K. B., Callaghan, S., Jordan, T. H., & Goulet, C. A. (2018, 06). The SCEC UCVM Software Framework for Distributing and Querying Seismic Velocity Models. Poster Presentation at 11th National Conference in Earthquake Engineering. SCEC Contribution 7989
Maechling, P. J., Taborda, R., Olsen, K. B., Callaghan, S., Jordan, T. H., & Goulet, C. A. (2017, 08). Current Capabilities of the SCEC Unified Community Velocity Model (UCVM) Software Framework. Poster Presentation at 2017 SCEC Annual Meeting. SCEC Contribution 7847
Callaghan, S., Maechling, P. J., Goulet, C. A., Milner, K. R., Graves, R. W., Olsen, K. B., & Jordan, T. H. (2017, 08). CyberShake: bringing physics-based PSHA to central California. Poster Presentation at 2017 SCEC Annual Meeting. SCEC Contribution 7725
da Silva, R. F., Callaghan, S., & Deelman, E. (2017, 08). On the use of burst buffers for accelerating data-intensive scientific workflows. Oral Presentation at International Conference for High Performance Computing, Networking, Storage and Analysis (SC 2017). SCEC Contribution 7610
Callaghan, S., Juve, G., Vahi, K., Maechling, P. J., Jordan, T. H., & Deelman, E. (2017, 08). rvGAHP - Push-based job submission using reverse SSH connections. Oral Presentation at International Conference for High Performance Computing, Networking, Storage and Analysis (SC 2017). doi: 10.1145/3150994.3151003. SCEC Contribution 7540
Troise, S. A., Bent, M. T., Hernandez, R. A., Cervantes, R. G., Hermosura, J., Martinez, M. D., Callaghan, S., Gilchrist, J. J., Pearson, J. K., Noriega, G. R., & Jordan, T. H. (2017, 08). 2017 UseIT: High Performance Computing Team. Poster Presentation at 2017 SCEC Annual Meeting. SCEC Contribution 7403
Callaghan, S., Graves, R. W., Olsen, K. B., Cui, Y., Milner, K. R., Goulet, C. A., Maechling, P. J., & Jordan, T. H. (2017, 08). 10 years of CyberShake: Where are we now and where are we going with physics-based PSHA?. Oral Presentation at 2017 SCEC Annual Meeting. SCEC Contribution 7394
Milner, K. R., Sanskriti, F., Yu, J., Callaghan, S., Maechling, P. J., & Jordan, T. H. (2016, 08). SCEC-VDO Reborn: A New 3-Dimensional Visualization and Movie Making Software for Earth Science Data. Poster Presentation at 2016 SCEC Annual Meeting. SCEC Contribution 7039
Callaghan, S., Maechling, P. J., Goulet, C. A., Vahi, K., Graves, R. W., Olsen, K. B., Milner, K. R., Gill, D., Cui, Y., & Jordan, T. H. (2016, 08). CyberShake Advancements: Broadband Seismograms and Central California Sites. Poster Presentation at 2016 SCEC Annual Meeting. SCEC Contribution 6874
Silva, F., Goulet, C. A., Maechling, P. J., Callaghan, S., & Jordan, T. H. (2016, 08). The SCEC Broadband Platform: Open-Source Software for Strong Ground Motion Simulation and Validation. Poster Presentation at 2016 SCEC Annual Meeting. SCEC Contribution 6554
Meng, X., Goulet, C. A., Milner, K. R., Graves, R. W., & Callaghan, S. (2023). Comparison of Nonergodic Ground Motion Components from CyberShake and NGA-West2 Datasets in California. Bulletin of the Seismological Society of America,. doi: 10.1785/0120220049. SCEC Contribution 12616
Callaghan, S., Goulet, C. A., Silva, F., Maechling, P. J., Graves, R. W., Olsen, K. B., Yeh, T., Kottke, A. R., & Ben-Zion, Y. (2022, 04). Verification and validation of the broadband CyberShake platform using observations. Oral Presentation at 2022 Seismological Society of America Annual Meeting. SCEC Contribution 12631
Callaghan, S., Milner, K. R., Goulet, C. A., Shaw, B. E., Maechling, P. J., Olsen, K. B., Graves, R. W., Vahi, K., Deelman, E., Jordan, T. H., & Ben-Zion, Y. (2022, 04). Non-ergodic PSHA using fully-deterministic physics-based models for Southern California. Oral Presentation at 2022 Seismological Society of America Annual Meeting. SCEC Contribution 12630
Callaghan, S., Goulet, C. A., Silva, F., Maechling, P. J., Graves, R. W., O'Reilly, O., Olsen, K. B., Kottke, A. R., Ben-Zion, Y., & Yeh, T. (2021, 12). Verification and validation of the broadband CyberShake platform. Oral Presentation at 2021 American Geophysical Union Fall Meeting. SCEC Contribution 12632
Lee, Y., Goulet, C. A., Hu, Z., Milner, K. R., & Callaghan, S. (2021, 03). Impacts of CyberShake on Risk Assessments for Distributed Infrastructure Systems. Poster Presentation at 2021 EERI Annual Meeting. SCEC Contribution 11724
Milner, K. R., Shaw, B. E., Goulet, C. A., Richards-Dinger, K. B., Callaghan, S., Jordan, T. H., Dieterich, J. H., & Field, E. H. (2021). Toward PhysicsâBased Nonergodic PSHA: A Prototype Fully Deterministic Seismic Hazard Model for Southern California. Bulletin of the Seismological Society of America,. doi: https://doi.org/10.1785/0120200216. SCEC Contribution 10107
Jordan, T. H., Callaghan, S., Graves, R. W., Wang, F., Milner, K. R., Goulet, C. A., Maechling, P. J., Olsen, K. B., Cui, Y., Juve, G., Vahi, K., Yu, J., Deelman, E., & Gill, D. (2018, 06). CyberShake Models of Seismic Hazards in Southern and Central California. Oral Presentation at Eleventh U.S. National Conference on Earthquake Engineering. SCEC Contribution 8991
Crouse, C., Jordan, T. H., Milner, K. R., Goulet, C. A., Callaghan, S., & Graves, R. W. (2018, 06). Site-Specific MCER Response Spectra for Los Angeles Region based on 3-D Numerical Simulations and the NGA West2 Equations. Oral Presentation at 11th National Conference in Earthquake Engineering. Paper #518. SCEC Contribution 8024
Small, P., Gill, D., Maechling, P. J., Taborda, R., Callaghan, S., Jordan, T. H., Ely, G. P., Olsen, K. B., & Goulet, C. A. (2017). The SCEC Unified Community Velocity Model Software Framework. Seismological Research Letters, 88(5). doi: 10.1785/0220170082 . SCEC Contribution 2067
Maechling, P. J., Silva, F., Callaghan, S., & Jordan, T. H. (2015). SCEC Broadband Platform: System Architecture and Software Implementation. Seismological Research Letters, 86(1), 27-38. doi: 10.1785/0220140125. SCEC Contribution 1981
Deelman, E., Vahi, K., Juve, G., Rynge, M., Callaghan, S., Maechling, P. J., Mayani, R., Chen, W., da Silva, R., Livny, M., & Wenger, K. (2014). Pegasus, a Workflow Management System for Large-Scale Science. Future Generation Computer Systems, 46, 15-35. doi: http://www.sciencedirect.com/science/article/pii/S0167739X14002015. SCEC Contribution 1911
Boese, M., Graves, R. W., Gill, D., Callaghan, S., & Maechling, P. J. (2014). CyberShake-Derived Ground-Motion Prediction Models for the Los Angeles Region with Application to Earthquake Early Warning. Geophysical Journal International, 198(3), 1438-1457. doi: 10.1093/gji/ggu198. SCEC Contribution 1799
Gill, D., Maechling, P. J., Jordan, T. H., Taborda, R., Callaghan, S., & Small, P. (2013, 7). SCEC Unified Community Velocity Model: Mesh Generation and Visualization. Oral Presentation at CIG/QUEST/IRIS Joint Workshop on Seismic Imaging of Structure and Source. SCEC Contribution 1888
Callaghan, S., Maechling, P. J., Vahi, K., Juve, G., Deelman, E., Cui, Y., Poyraz, E., & Jordan, T. H. (2013, 11). Running A Seismic Workflow Application on Distributed Resources. Poster Presentation at SC13. SCEC Contribution 1843
Cui, Y., Poyraz, E., Olsen, K. B., Zhou, J., Withers, K. B., Callaghan, S., Larkin, J., Guest, C., Choi, D., Chourasia, A., Shi, Z., Day, S. M., Maechling, P. J., & Jordan, T. H. (2013, 11). Physics-based Seismic Hazard Analysis on Petascale Heterogeneous Supercomputers. Oral Presentation at SC13. doi: 10.1145/2503210.2503300. SCEC Contribution 1753
Jordan, T. H., Callaghan, S., Maechling, P. J., Juve, G., Deelman, E., Rynge, M., Vahi, K., & Silva, F. (2012, 12). Workflow Management of the SCEC Computational Platforms for Physics-Based Seismic Hazard Analysis. Oral Presentation at AGU Fall Meeting 2012. SCEC Contribution 1782
Boese, M., Graves, R. W., Callaghan, S., & Maechling, P. J. (2012, 12). Site-specific Ground-Motion Predictions for Earthquake Early Warning in the LA Basin using CyberShake Simulations. Oral Presentation at AGU Fall Meeting 2012. SCEC Contribution 1771
Rynge, M., Juve, G., Vahi, K., Callaghan, S., Mehta, G., Maechling, P. J., & Deelman, E. (2012, 7). Enabling Large-scale Scientific Workflows on Petascale Resources Using MPI Master/Worker. Oral Presentation at XSEDE Conference 2012. doi: 10.1145/2335755.2335846. SCEC Contribution 1636
Callaghan, S., Maechling, P. J., Small, P., Milner, K. R., Juve, G., Jordan, T. H., Deelman, E., Mehta, G., Vahi, K., Gunter, D., Beattie, K. S., & Brooks, C. J. (2011). Metrics for Heterogeneous Scientific Workflows: A Case Study of an Earthquake Science Application. International Journal of High Performance Computing Applications, 25(3), 274-285. doi: 10.1177/1094342011414743. SCEC Contribution 1484
Graves, R., Jordan, T. H., Callaghan, S., Deelman, E., Field, E. H., Juve, G., Kesselman, C., Maechling, P., Mehta, G., Milner, K., Okaya, D., Small, P., & Vahi, K. (2010). CyberShake: A Physics-Based Seismic Hazard Model for Southern California. Pure and Applied Geophysics, 168(3-4), 367-381. doi: 10.1007/s00024-010-0161-6. SCEC Contribution 1354
Callaghan, S., Maechling, P. J., Deelman, E., Vahi, K., Mehta, G., Juve, G., Milner, K. R., Graves, R. W., Field, E. H., Okaya, D. A., Beattie, K. S., & Jordan, T. H. (2008). Reducing Time-to-Solution Using Distributed High-Throughput Mega-Workflows -- Experiences from SCEC CyberShake. Oral Presentation at 4th IEEE International Conference on eScience. SCEC Contribution 1237
Deelman, E., Callaghan, S., Francoeur, H., Graves, R. W., Gupta, N., Gupta, V., Jordan, T. H., Kesselman, C., Maechling, P. J., Mehringer, J., Mehta, G., Okaya, D. A., Vahi, K., & Zhao, L. (2006, 12). Managing Large-Scale Workflow Execution from Resource Provisioning to Provenance Tracking: The CyberShake Example. Presentation at e-Science'06. doi: 10.1109/E-SCIENCE.2006.261098. SCEC Contribution 1060
Last updated Aug 19, 2024.
