Rapid source inversions of the 2023 SE Türkiye earthquakes with teleseismic and strong-motion data


Xu C., Zhang Y., Hua S., Zhang X., Xu L., Chen Y., ...More

Earthquake Science, vol.36, no.4, pp.316-327, 2023 (ESCI) identifier

  • Publication Type: Article / Article
  • Volume: 36 Issue: 4
  • Publication Date: 2023
  • Doi Number: 10.1016/j.eqs.2023.05.004
  • Journal Name: Earthquake Science
  • Journal Indexes: Emerging Sources Citation Index (ESCI), Scopus, Academic Search Premier, Aquatic Science & Fisheries Abstracts (ASFA), Business Source Elite, Business Source Premier, Civil Engineering Abstracts
  • Page Numbers: pp.316-327
  • Keywords: fast source inversion, strong-motion inversion, teleseismic inversion, the 2023 earthquake doublet in SE Türkiye
  • Istanbul Technical University Affiliated: Yes

Abstract

We conducted rapid inversions of rupture process for the 2023 earthquake doublet occurred in SE Türkiye, the first with a magnitude of MW7.8 and the second with a magnitude of MW7.6, using teleseismic and strong-motion data. The teleseismic rupture models of the both events were obtained approximately 88 and 55 minutes after their occurrences, respectively. The rupture models indicated that the first event was an asymmetric bilateral event with ruptures mainly propagating to the northeast, while the second one was a unilateral event with ruptures propagating to the west. This information could be useful in locating the meizoseismal areas. Compared with teleseismic models, the strong-motion models showed relatively higher resolution. A noticeable difference was found for the MW7.6 earthquake, for which the strong-motion models shows a bilateral event, rather than a unilateral event, but the dominant rupture direction is still westward. Nevertheless, all strong-motion models are consistent with the teleseismic models in terms of magnitudes, durations, and dominant rupture directions. This suggests that both teleseismic and strong-motion data can be used for fast determination of major source characteristics. In contrast, the strong-motion data would be preferable in future emergency responses since they are recorded earlier and have a better resolution ability on the source ruptures.