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ISPRS Int. J. Geo-Inf. 2018, 7(9), 375; https://doi.org/10.3390/ijgi7090375

Geospatial Assessment of the Post-Earthquake Hazard of the 2017 Pohang Earthquake Considering Seismic Site Effects

1
Earthquake Research Center, Korea Institute of Geoscience and Mineral Resources, Daejeon 305-350, Korea
2
Geological Research Division, Korea Institute of Geoscience and Mineral Resources, Daejeon 305-350, Korea
*
Author to whom correspondence should be addressed.
Received: 15 July 2018 / Revised: 17 August 2018 / Accepted: 5 September 2018 / Published: 10 September 2018
(This article belongs to the Special Issue Natural Hazards and Geospatial Information)
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Abstract

The 2017 Pohang earthquake (moment magnitude scale: 5.4) was South Korea’s second strongest earthquake in decades, and caused the maximum amount of damage in terms of infrastructure and human injuries. As the epicenters were located in regions with Quaternary sediments, which involve distributions of thick fill and alluvial geo-layers, the induced damages were more severe owing to seismic amplification and liquefaction. Thus, to identify the influence of site-specific seismic effects, a post-earthquake survey framework for rapid earthquake damage estimation, correlated with seismic site effects, was proposed and applied in the region of the Pohang earthquake epicenter. Seismic zones were determined on the basis of ground motion by classifying sites using the multivariate site classification system. Low-rise structures with slight and moderate earthquake damage were noted to be concentrated in softer sites owing to the low focal depth of the site, topographical effects, and high frequency range of the mainshocks. View Full-Text
Keywords: geo-data; seismic site effects; post-earthquake survey; earthquake impact; 2017 Pohang earthquakes geo-data; seismic site effects; post-earthquake survey; earthquake impact; 2017 Pohang earthquakes
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Kim, H.-S.; Sun, C.-G.; Cho, H.-I. Geospatial Assessment of the Post-Earthquake Hazard of the 2017 Pohang Earthquake Considering Seismic Site Effects. ISPRS Int. J. Geo-Inf. 2018, 7, 375.

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