Role of Backbone Fault System on Earthquake Spawning and Geohazards in the Seoul Metropolitan Area

Major earthquakes in continental regions may cause significant damage. Preexisting fault system across megacity receives high attention for possible seismic damages. Earthquake occurrence mechanism is important to assess the geohazard potentials. Continental-scale Quaternary developed Seoul metropolitan area where population largest Korean Peninsula. Historical seismic-damage records suggest potential hazards area. We investigate motions and spatial distribution of using a matched-filter technique that based on stacked waveform crosscorrelation functions among densely-deployed stations. The analysis detects 1103 include 360 events with magnitudes (ML) −0.6 2.0 around Chugaryeong 34 −0.5 2.7 Wangsukcheon, Pocheon, Yeseonggang faults. seismicity suggests set near-vertical subparallel (or orthogonal) faults develop from major A behaves as backbone structure makes branch develop, producing including earthquakes. control development conforms ambient stress field. play role increase