Time-advanced occurrence of moderate-size earthquakes in a stable intraplate region after a megathrust earthquake and their seismic properties.

ABSTRACT: 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_L

SUBMITTER: Hong TK 

PROVIDER: S-EPMC6127306 | biostudies-literature | 2018 Sep

REPOSITORIES: biostudies-literature