Published February 27, 2024 | Version v2
Dataset Open

Deep learning-based earthquake catalog of the 2022 MW 6.9 Chihshang, Taiwan, earthquake sequence

Creators

  • 1. ROR icon National Taiwan University
  • 2. YIC Geological Office
  • 3. Seismological Center, Central Weather Administration
  • 4. ROR icon Institute of Earth Sciences, Academia Sinica

Description

On 18 September 2022, the MW 6.9 Chihshang earthquake struck the southern Longitudinal Valley, Taiwan. We use SeisBlue, a deep-learning platform/package, to extract the two-month earthquake sequence from September to October 2022, including the MW 6.5 Guanshan foreshock, the MW 6.9 mainshock, over 14,000 aftershocks, and 866 focal mechanisms from two sets of broadband networks. For more details, please refer to our research article published at TAO (Sun et al., 2024; https://doi.org/10.1007/s44195-024-00063-9). The refined SeisBlue earthquake, FMS, and 20-year M3+ relocated CWA earthquake catalogs obtained in this study are listed here.

  1. The refined, deep-learning-based earthquake catalog of the 2022 Mw 6.9 Chihshang, Taiwan, earthquake sequence contains 5,151 seismic events with event time, location and error information, local and moment magnitudes, and hypoDD location. 
  2. The FMS (focal mechanism solution) catalog is obtained by the P-wave polarities of 14 broadband stations and the FPFIT program (Reasenberg & Oppenheimer, 1985). 865 out of 1629 FMSs with at least six readings of P-wave polarity, F-fator ≤ 0.1 (F < 0.5 for a good fit), and errors of strike, dip, and rake are all < 20°, respectively, are listed in the attached FMS catalog.
  3. The 2001-2020 3D-hypoDD-relocated M3+ CWA earthquake catalog: We applied the HypoDD program (Waldhauser & Ellsworth, 2000) to the CWA (Central Weather Administration (CWA, Taiwan), 2012) catalog with P- and S-wave arrivals and obtained 5862 M3+ events between 2001 and 2020 for eastern Taiwan. The 3D velocity models used for this catalog are the local models from Kuo-Chen et al. (2012).

 

Files

2024_Sun_TAO_2001-2020_CWA_3DhyooDD.txt

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Additional details

Dates

Accepted
2024-02-06

References

  • Sun, W. F., Pan, S. Y., Huang, C. M., Guan, Z. K., Yen, I. C., Ho, C. W., Chi, T. C., Ku, C. S., Huang, B. S., Fu, C. C. & Kuo-Chen, H. (2024). Deep learning-based earthquake catalog reveals the seismogenic structures of the 2022 MW 6.9 Chihshang earthquake sequence. Terr Atmos Ocean Sci 35, 5. https://doi.org/10.1007/s44195-024-00063-9
  • Central Weather Administration (CWA, Taiwan). (2012). Central Weather Administration Seismographic Network [Data set]. International Federation of Digital Seismograph Networks. https://doi.org/10.7914/SN/T5.
  • Kuo‐Chen, H., Wu, F. T., & Roecker, S. W. (2012). Three‐dimensional P velocity structures of the lithosphere beneath Taiwan from the analysis of TAIGER and related seismic data sets. J. Geophys. Res. Solid Earth, 117(B6). https://doi.org/10.1029/2011JB009108
  • Reasenberg, P.A., & Oppenheimer, D. (1985). FPFIT, FPPLOT and FPPAGE; Fortran computer programs for calculating and displaying earthquake fault-plane solutions. US Geol. Surv. Open-File Rep., 85-739.
  • Waldhauser, F., & Ellsworth, W. L. (2000). A double-difference earthquake location algorithm: Method and application to the northern Hayward fault, California. Seismol. Soc. Am., Bull., 90(6), 1353-1368.
  • Waldhauser, F. (2001). HypoDD: A computer program to compute double-difference earthquake locations, U.S. Geol. Surv. Open-File Report, 01-113, Menlo Park, California.