Measurement of seismometer misorientation based on P-wave polarization: application to dense temporary broadband seismic array in the epicentral region of 2016 Gyeongju earthquake, South Korea

Min Seong Seo, Young Oh Son, Young Hee Kim, Tae Seob Kang, Junkee Rhie, Kwang Hee Kim, Jin Han Ree

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

In this study, we probe the misalignment of 200 temporary broadband seismometers based on the polarization of P waves from regional and teleseismic earthquakes. The seismometers were deployed in the epicentral region of 2016 ML 5.8 Gyeongju earthquake, South Korea, and this unprecedented dense array provided a unique opportunity for investigating fault structures from microseismicity. For the full use of three-component seismic records, we estimate and provide time-dependent misorientation angles of the 200 seismometers from June 2018 to March 2021 with uncertainty assessments. Two methods based on the principal component analysis and the minimization of transverse P-wave energy are applied. Our estimates are characterized by small uncertainty (average median absolute deviation of 3.14°). Moreover, periods of suspected temporal changes in misorientation angles mostly coincide with periods of reported technical operations, which demonstrates reliability of our methods to precisely detect the temporal variation of misorientation angles. We expect our misorientation angles to serve as an essential metadata for further seismological researches utilizing the dense array data.

Original languageEnglish
JournalGeosciences Journal
DOIs
Publication statusAccepted/In press - 2022

Bibliographical note

Funding Information:
This work was supported by SNU Student-directed Education Undergraduate Research Program through the Faculty of Liberal Education, Seoul National University (2020). The authors thank W.-Y. Kim, H. Lim and H. Kang in Seoul National University for constructive suggestions which improved the quality of the work. Authors acknowledge support from the Nuclear Safety Research Program through the Korea Foundation of Nuclear Safety (KoFONS), granted financial resource from the Nuclear Safety and Security Commission (NSSC), Republic of Korea (No. 1705010). Y. Kim acknowledges support from Creative-Pioneering Researchers Program through Seoul National University (SNU SRnD 3345-20160014). Finally, the authors thank Guest Editor, Dong-Hoon Sheen, and two anonymous reviewers for comments which greatly improved this paper.

Publisher Copyright:
© 2022, The Association of Korean Geoscience Societies and Springer.

Keywords

  • 2016 Gyeongju earthquake
  • P-wave polarization
  • change point detection
  • receiver function analysis
  • seismometer misorientation

ASJC Scopus subject areas

  • General Environmental Science
  • General Earth and Planetary Sciences

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