Reactivated timings of Yangsan fault in the Northern Pohang Area, Korea

Ho Sim, Yungoo Song, Moon Son, Changyun Park, Woohyun Choi, Chuluunbaatar Khulganakhuu

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


Here we present the timings of reactivated events from a fault in the northern Pohang area, which should be located at the northern-end of Yangsan fault line, the major fault in the southeastern Korean Peninsula. Recently developed illite-age-analysis (IAA) approach was employed for determining the fault-activated timing, combined with illite-polytype quantification using the optimized full-pattern-fitting (FPF) method, and K-Ar age-dating for each size fraction(<0.1 μm, 0.1-0.4 μm, and 0.4-1.0 μm) of 4 fault clay samples. Two chronological records of brittle fault-activation events were recognized at 19.6±1.86 Ma and 26.1±2.55-27.9±3.46 Ma. The ages are much younger than those of fault clays from Sangcheon-ri area (41.5∼43.5 and 50.7 Ma), the southern part of Yangsan fault line, and are close to the timing of East Sea-opening event. Further chronological analysis for additional sites of the Yangsan fault should be needed to reveal the time-scheme of the tectonic events and their spatial distributions along the fault line.

Original languageEnglish
Pages (from-to)97-104
Number of pages8
JournalEconomic and Environmental Geology
Issue number2
Publication statusPublished - 2017 Apr

All Science Journal Classification (ASJC) codes

  • Environmental Science (miscellaneous)
  • Geology
  • Economic Geology


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