Qiushi Zhai's Homepage

Postdoc, Seismo Lab, Caltech. qzhai@caltech.edu



          My name is Qiushi [Chee-oh Shr] Zhai [Jai] (翟秋实). I am a postdoctoral scholar (2022-present) at Caltech Seismo Lab collaborating with Dr. Zhongwen Zhan. My Ph.D. (2022) in Geophysics was awarded by Georgia Tech, where I worked with Dr. Zhigang Peng. Before that, I completed my M.S. (2017) and B.S. (2014, School of the Gifted Young) in Geophysics at USTC, both supervised by Dr. Huajian Yao.

          As an observational seismologist, my research is dedicated to advancing our understanding of earthquakes and faults. Specifically, I focus on (1) promoting the development of the emerging fiber-optic distributed acoustic sensing (DAS) technology in Earth and planetary science, and (2) implementing cutting-edge data mining techniques, such as machine learning and template matching, to extract valuable signals from extensive seismic datasets. I believe these cutting-edge data mining methods and novel sensing technology are crucial in gaining insights into the spatiotemporal evolution of earthquake sequences and unraveling the underlying physics of earthquakes.


Google Scholar | ORCID: 0000-0003-2583-5146

• Peer Reviewed:

  1. Zhai, Q., Peng, Z., Matsubara, M., Obara, K., & Wang, Y. (2023). Spatiotemporal Variations of Intermediate-Depth Earthquakes Before and After 2011 Tohoku Earthquake Revealed by a Template Matching Catalog. Geophysical Research Letters, 50(22), e2023GL104068. https://doi.org/10.1029/2023GL104068 [PDF]

  2. Chen, W., Neves, M., Zhai, Q., Daniels, C., Adeboboye, O., Jaume, S., & Peng, Z. (2023). Preliminary Results from a Dense Short‐Period Seismic Deployment around the Source Zone of the 1886 M 7 South Carolina Earthquake. Seismological Research Letters. https://doi.org/10.1785/0220230085 [PDF]

  3. Chuang, L. Y., Peng, Z., Lei, X., Wang, B., Liu, J., Zhai, Q., & Tu, H. (2023). Foreshocks of the 2010 Mw 6.7 Yushu, China Earthquake Occurred Near an Extensional Step-Over. Journal of Geophysical Research: Solid Earth, 128(1), e2022JB025176. https://doi.org/10.1029/2022JB025176 [PDF]

  4. Li, C., Peng, Z., Yao, D., Meng, X., & Zhai, Q. (2023). Temporal changes of seismicity in Salton Sea Geothermal Field due to distant earthquakes and geothermal productions. Geophysical Journal International, 232(1), 287–299. https://doi.org/10.1093/gji/ggac324 [PDF]

  5. Zhai, Q., Peng, Z., Chuang, L. Y., Wu, Y.-M., Hsu, Y.-J., & Wdowinski, S. (2021). Investigating the Impacts of a Wet Typhoon on Microseismicity: A Case Study of the 2009 Typhoon Morakot in Taiwan Based on a Template Matching Catalog. Journal of Geophysical Research-Solid Earth, 126(12). https://doi.org/10.1029/2021jb023026 [PDF]

  6. Zhai, Q., Yao, H., & Peng, Z. (2019). Upper mantle shear velocity structure beneath the equatorial East Pacific Rise from array-based teleseismic surface-wave dispersion analysis. Geophysical Journal International, 219(1), 607–618. https://doi.org/10.1093/gji/ggz314 [PDF]

  7. She, Y., Yao, H., Zhai, Q., Wang, F., & Tian, X. (2018). Shallow Crustal Structure of the Middle‐Lower Yangtze River Region in Eastern China from Surface‐Wave Tomography of a Large Volume Airgun‐Shot Experiment. Seismological Research Letters, 89(3), 1003–1013. https://doi.org/10.1785/0220170232 [PDF]

  8. Zhai, Q., Yao, H., & Wang, B. (2016). Study on the deconvolution method and processing flow of air-gun source data. Earthquake Research in China, 295–304. [PDF] [PDF (in Chinese)]

  9. Hu, J., Qian, J., Guo, H., Wang, K., Zhai, Q., Zhang, H., Yao, H., Zhang, W., & An, M. (2016). Station-pair double-difference seismic tomography using Lujiang seismic network with air-gun data from the Yangtze River Active Source Experiment in Anhui province. Earthquake Research in China, 32(2), 343–355. [PDF (in Chinese)]

• Non-Peer Reviewed:

  1. Zhai, Q., Peng, Z., & Hsu, Y.-J. (2023). Southern California Earthquake Was Unlikely Triggered by Hurricane Hilary. Temblor. https://doi.org/10.32858/temblor.322 [PDF]

  2. Zhai, Q. (2022). Understanding microseismicity behavior and their response to earth processes by improving earthquake catalogs. Ph.D. Thesis. Georgia Institute of Technology. http://hdl.handle.net/1853/67203 [PDF]

  3. Zhai, Q. (2017). Study on the Velocity Structure and Its Change in Dali Region of Yunnan Province Based on Passive Source and Active Source Methods. M.S. Thesis. University of Science and Technology of China. [PDF (in Chinese)]

Selected Conference Abstracts on Ongoing Projecs

  1. Zhai, Q., Zhan, Z., & Chavarria, J. A. (2023). Thousand-kilometer DAS array reveals an uncatalogued magnitude-5 dynamically triggered event after the 2023 Turkey earthquake. AGU Fall Meeting.

  2. Zhai, Q., Zhan, Z., & Karrenbach, M. H. (2023). Instrument performance evaluation and seismic signal classification of a DAS array at the south pole. AGU Fall Meeting.

  3. Zhai, Q., Yin, J., Yang, Y., Atterholt, J. W., & Zhan, Z. (2023). Comprehensive evaluation of DAS arrays in California: instrument response, noise level, and amplitude clipping. SCEC Annual Meeting.

  4. Zhai, Q., Peng, Z., Heidary, R., Williams, J., Howard, S., Dai, S., Zhu, L., & Wu, Y.-M. (2021). P-wave first-motion polarity determination using deep learning. AGU Fall Meeting.

Professional Services

• Session Convener:

  • Seismological Society of America Annual Meeting, 2023, Puerto Rico.

• Seminar Organizer:

  • Georgia Tech Geophysics Seminar, 2021.
  • Caltech Seismo Lab Brown Bag Seminar, 2023

• Journal Reviewer:

  • Nature Geoscience
  • Geophysical Research Letters
  • Earth and Space Science
  • IEEE Transactions on Geoscience and Remote Sensing
  • Artificial Intelligence in Geosciences
  • Journal of Rock Mechanics and Geotechnical Engineering
  • Others



    California Institute of Technology
    Seismological Laboratory
    1200 E. California Blvd., MS 252-21
    So. Mudd Building, Rm 268
    Pasadena, CA 91125