Seismogenic structure beneath décollement inferred from 2009/11/5 ML 6.2 mingjian earthquake in central Taiwan

Che Min Lin, Tao Ming Chang, Kuo Liang Wen, Chun Hsiang Kuo, Hung Hao Hsieh

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

One decade after the 1999 Chi-Chi earthquake, central Taiwan experienced more strong ground shaking [Central Weather Bureau (CWB), intensity VII] induced by a ML 6.2 earthquake on 5th November 2009. This earthquake occurred in the Mingjian Township of Nantou County, only 12 km southwest of the Chi-Chi earthquake epicenter. The broadband micro-earthquake monitoring network operated by the National Center for Research on Earthquake Engineering (NCREE) observed numerous aftershocks in the five days following the mainshock. The relocated aftershocks and the mainshock focal mechanism indicated a NE-SW striking fault dipping 60° toward the northwest. This fault plane is inside the pre-Miocene basement and the rupture extends from the lower crust to 10 km depth just beneath the basal décollement of the thin-skinned model that is generally used to explain the regional tectonics in Taiwan. The fault plane is vertically symmetrical with the Chelungpu fault by the basal décollement. The NW-SE compressive stress of plate collision in Taiwan, as well as the deep tectonic background, resulted in the seismogenic structure of the Mingjian earthquake at this location.

Original languageEnglish
Pages (from-to)27-38
Number of pages12
JournalTerrestrial, Atmospheric and Oceanic Sciences
Volume25
Issue number1
DOIs
StatePublished - 2014

Keywords

  • Chi-Chi earthquake
  • Décollement
  • Mingjian earthquake
  • Thin-skinned model

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