The moment magnitude (Mw) 5.4 Pohang earthquake, the most damaging event in South Kore since instrumental seismic observation began in 1905, occurred beneath the Pohang geothermal power plant in 2017. Geological and geophysical data suggest that the Pohang earthquake was induced by fluid from an enhanced geothermal system (EGS) site, which was injected directly into a near-critically stressed subsurface fault zone. The magnitude of the mainshock makes it the largest known induced earthquake at an EGS site.
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We thank Representative S. S. Kim of the National Assembly and the Ministry of Trade, Industry and Energy, Republic of Korea, for providing fluid injection data. We are grateful to the Korea Meteorological Administration for providing continuous waveforms used in the study We also thank two anonymous reviewers for their constructive comments. This work was supported by the Nuclear Safety Research Program through the Korea Foundation of Nuclear Safety (KoFONS) using financial resources granted by the Nuclear Safety and Security Commission (NSSC) of the Republic of Korea (no. 1705010).
2017 © The Authors.
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