3D fabric analysis in fault rock using synchrotron µ-CT: A statistical approach to SPO (shape preferred orientation) for estimation of fault motion

Ho Sim, Yungoo Song, Seongsik Hong, Sung Ja Choi

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

This study provides information about fault motion by statistically presenting shape and orientation information for tens of thousands of grains. The recently developed shape preferred orientation (SPO) measurement method using synchrotron micro-computed tomography was used. In addition, various factors that were not considered in previous SPO analysis were analyzed in-depth. The study area included the Yangsan and Ulsan fault zones, which are the largest fault zones in the southeastern part of the Korean Peninsula. Samples were collected from five outcrops in two regions. According to the field observation results, the samples in the area were largely divided into fault gouge and cataclasite, and as a result of SPO analysis, we succeeded in restoring the three-dimensional fault motion direction for each outcrop and identified the fault type. In addition, the analysis results of the fault gouge and cataclasite samples collected from the thin fault zone were interpreted using the focal mechanism solution. As a result, the statistical SPO analysis approach supplements the shortcomings of previous research methods on two-dimensional planes and can quantitatively infer the three-dimensional fault motion for various fault rock samples in the same sequence, thus, presenting useful evidence for structural analysis.

Original languageEnglish
Article number994
Pages (from-to)1-16
Number of pages16
JournalMinerals
Volume10
Issue number11
DOIs
Publication statusPublished - 2020 Nov

Bibliographical note

Funding Information:
Funding: This study was funded by the Korea Meteorological Administration Research and Development Program under grant KMI2018-01910.

Funding Information:
Acknowledgments: We would like to appreciate the reviewers and editor who reviewed this paper, and also thank those who helped us with the editing process. This study was supported by the study on submarine active faults and evaluation of possibility of submarine earthquakes in the southern part of the East Sea, Korea of the Ministry of Land, Infrastructure, and Transport.

Publisher Copyright:
© 2020 by the authors. Licensee MDPI, Basel, Switzerland.

All Science Journal Classification (ASJC) codes

  • Geotechnical Engineering and Engineering Geology
  • Geology

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