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Title:
The November 2017 Mw 5.5 Pohang earthquake: A possible case of induced seismicity in South Korea
Authors:
Grigoli, F.; Cesca, S.; Rinaldi, A. P.; Manconi, A.; López-Comino, J. A.; Clinton, J. F.; Westaway, R.; Cauzzi, C.; Dahm, T.; Wiemer, S.
Affiliation:
AA(Swiss Seismological Service, ETH-Zurich, Zurich, Switzerland 0000-0002-2858-9756), AB(Section 2.1: Physics of Earthquakes and Volcanoes, German Research Centre for Geosciences (GFZ), Potsdam, Germany 0000-0001-9419-3904), AC(Swiss Seismological Service, ETH-Zurich, Zurich, Switzerland 0000-0001-7052-8618), AD(Engineering Geology Group, Department of Earth Sciences, ETH-Zurich, Zurich, Switzerland 0000-0003-2930-4422), AE(Section 2.1: Physics of Earthquakes and Volcanoes, German Research Centre for Geosciences (GFZ), Potsdam, Germany 0000-0002-0337-7888), AF(Swiss Seismological Service, ETH-Zurich, Zurich, Switzerland 0000-0001-8626-2703), AG(School of Engineering, University of Glasgow, Glasgow, UK 0000-0001-5683-4192), AH(Swiss Seismological Service, ETH-Zurich, Zurich, Switzerland 0000-0003-2033-4537), AI(Section 2.1: Physics of Earthquakes and Volcanoes, German Research Centre for Geosciences (GFZ), Potsdam, Germany.; Institute of Earth and Environmental Sciences, University of Potsdam, Potsdam, Germany 0000-0001-6432-7422), AJ(Swiss Seismological Service, ETH-Zurich, Zurich, Switzerland 0000-0002-4919-3283)
Publication:
Science, Volume 360, Issue 6392, pp. 1003-1006 (2018). (Sci Homepage)
Publication Date:
06/2018
Category:
GEOCHEM PHYS
Origin:
SCIENCE
Abstract Copyright:
(c) 2018: Science
DOI:
10.1126/science.aat2010
Bibliographic Code:
2018Sci...360.1003G

Abstract

The moment magnitude (Mw) 5.5 earthquake that struck South Korea in November 2017 was one of the largest and most damaging events in that country over the past century. Its proximity to an enhanced geothermal system site, where high-pressure hydraulic injection had been performed during the previous 2 years, raises the possibility that this earthquake was anthropogenic. We have combined seismological and geodetic analyses to characterize the mainshock and its largest aftershocks, constrain the geometry of this seismic sequence, and shed light on its causal factors. According to our analysis, it seems plausible that the occurrence of this earthquake was influenced by the aforementioned industrial activities. Finally, we found that the earthquake transferred static stress to larger nearby faults, potentially increasing the seismic hazard in the area.
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