文章基本信息

标题：Time-advanced occurrence of moderate-size earthquakes in a stable intraplate region after a megathrust earthquake and their seismic properties
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作者：Tae-Kyung Hong ; Junhyung Lee ; Seongjun Park 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2018
卷号：8
期号：1
页码：13331
DOI：10.1038/s41598-018-31600-5
语种：English
出版社：Springer Nature
摘要：The distance-dependent coseismic and postseismic displacements produced by the 2011 M _W9.0 Tohoku-Oki megathrust earthquake caused medium weakening and stress perturbation in the crust around the Korean Peninsula, increasing the seismicity with successive M _L5-level earthquakes at the outskirts of high seismicity regions. The average M _L5-level occurrence rate prior to the megathrust earthquake was 0.15 yr⁻¹ (0.05–0.35 yr⁻¹ at a 95% confidence level), and the rate has increased to 0.71 yr⁻¹ (0.23–1.67 yr⁻¹ at a 95% confidence level) since the megathrust earthquake. The 2016 M _L5-level midcrustal earthquakes additionally changed the stress field in adjacent regions, inducing the 15 November 2017 M _L5.4 earthquake. The successive 2016 and 2017 moderate-size earthquakes built complex stress fields in the southeastern Korean Peninsula, increasing the seismic hazard risks in the regions of long-term stress accumulation. The increased seismic risks may continue until the medium properties and stress field are recovered.