Geosciences Journal

The Association of Korean Geoscience Societies (한국지질과학협의회)
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Did the 12 September 2016 Gyeongju, South Korea earthquake cause surface deformation?

  • Park, Sun-Cheon (Earthquake and Volcano Research Division, Earthquake and Volcano Center, Korea Meteorological Administration) ;
  • Yang, Hyojin (Earthquake and Volcano Research Division, Earthquake and Volcano Center, Korea Meteorological Administration) ;
  • Lee, Duk Kee (Earthquake and Volcano Research Division, Earthquake and Volcano Center, Korea Meteorological Administration) ;
  • Park, Eun Hee (Earthquake and Volcano Research Division, Earthquake and Volcano Center, Korea Meteorological Administration) ;
  • Lee, Won-Jin (Earthquake and Volcano Research Division, Earthquake and Volcano Center, Korea Meteorological Administration)
  • Received : 2017.04.23
  • Accepted : 2017.06.07
  • Published : 2018.04.30
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Abstract

An earthquake with a local magnitude ($M_L$) of 5.8 occurred on 12 September 2016 near Gyeongju, South Korea. This earthquake was the largest event on record in Korea since 1978. A relatively large ($M_L$ 5.1) foreshock preceded the main shock by about 50 min, and numerous aftershocks followed. In this study, we performed seismological and geodetic analyses to determine the possibility of the occurrence of surface deformation. Estimated surface deformation using seismological analysis was less than 1 cm, and that observed by geodetic (GNSS and InSAR) data was within the range of error. These results indicate that no surface deformation occurred due to this earthquake. This may have been due to relatively small size of the fault plane ($4km{\times}4km$), moderate moment magnitude (Mw 5.5) or deep focal depth (15.4 km) of the earthquake.

Keywords

Acknowledgement

Grant : Research and Development for KMA Weather, Climate and Earth System Services

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