Benefits of defining geological sensitive zones in the mitigation of disasters along earthquake fault zones in taiwan – the case of milun fault

Tyan Ming Chu, Wen Jeng Huang, Tsung Yi Lin, Shih Ting Lu, Yen Chiu Liu, Cheng Shing Chiang, Yi Huei Chang

Research output: Contribution to journalArticlepeer-review

Abstract

In Taiwan, the main purpose of earthquake fault zone legislation is to prevent earthquake-related disasters around the surface traces of active faults, particularly in urban areas. Here, the Geologically Sensitive Area (GSA) of the Milun Fault (Milun Earthquake Fault Zone) is used as an example to reveal the importance of such legislation. Field data collected along the Milun Fault before and after the 2018 Hualien Earthquake were used to reveal the reappearance of damages within the GSA. The 2018 Hualien Earthquake represents one of the shortest recurrence intervals (67 years) among all major faults in Taiwan. Most of the surface ruptures and damaged buildings in Hualien City were within the Milun Fault GSA and concentrated on the hanging wall of the fault. Moreover, 61% (91/148) of the damaged buildings and 83% (692/835) of the surface ruptures occurred within 100 m of the fault line. The results of this study demon-strate the importance of defining GSAs of active faults for mitigating earthquake hazards.

Original languageEnglish
Pages (from-to)1257-1264
Number of pages8
JournalJournal of Disaster Research
Volume16
Issue number8
DOIs
StatePublished - Dec 2021

Keywords

  • Earthquake fault zone
  • Milun Fault
  • Surface rupture
  • Taiwan

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