Establishment of a precision post-earthquake analysis system and its application to major earthquake on the Korean Peninsula

Currently, when an earthquake with a magnitude (ML) of 3.5 or greater occurs ob the Korean Peninsula, the Korea Meteorological Administration (KMA) performs a post-event precision analysis to address parameters not captured during the real-time detection phase. To ensure consistent and operationally application, we developed the Post-Earthquake Precision Analysis System, which standardizes the entire workflow from data input to staged outputs.The system enhances location accuracy through precise hypocenter relocation, including relative relocation, and characterizes rupture geometry and kinematics using P-wave first-motion polarity and waveform inversion for focal mechanism solutions. Additionally, spectrum-based source parameter analysis is integrated to quantify the physical characteristics of the seismic source. To improve the completeness of the aftershock catalog, the system employs template matching to detect micro-seismic events that often go unnoticed.The Post-Earthquake Precision Analysis System was applied to major seismic events in the Korean Peninsula, yielding high-precision relocated hypocenters, focal mechanisms, and source parameters. We also generated enhanced aftershock lists and systematically organized the spatio-temporal evolution of each sequence in a standardized format. This study presents an operationally-ready analytical workflow and a core output framework for the systematic post-earthquake precision analysis of domestic seismic activity.