ABSTRACT

An Mw 5.4 earthquake occurred in the city of Pohang in the southeastern part of the Korean Peninsula on 15 November 2017. It was a moderate‐sized crustal event but triggered enormous attention from the Korean public because strong shaking was felt over the whole country, and it had been just a year since the Mw 5.5 Gyeongju earthquake, the largest instrumentally recorded event in the country. Both earthquakes occurred within 40 km of each other. The Pohang earthquake provides a unique opportunity to constrain the static slip model of an earthquake in Korea using spaceborne Interferometric Synthetic Aperture Radar (InSAR) observations because the focal depth is relatively shallow (4  km), and surface displacement fields were successfully obtained by both descending and ascending orbits of the Sentinel‐1A/B satellites. We performed a linear slip inversion using the InSAR data. Our slip model reveals that a major slip associated with the event occurred in the northeastern part of the hypocenter rather than in the southwestern part. In addition, its rupture dimension and mean slip are 5 km (width) by 6 km (length) and 15 cm, respectively. The InSAR data also show that no significant postseismic deformation occurred after the event.

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