Moment Magnitude Homogenization Relations in the South Korean Region from 1900 to 2020

Abstract

Utilizing several international and local earthquake catalogs, a set of regression models converting magnitude types typically found in the South Korean region to moment magnitude MW is presented. These linear regressions were performed using ordinary and total least squares techniques. A standard deviation applied to the residuals was used as a metric for ranking the MW regressions. This resulted in MW regressions from MV,JMA, MD,JMA, MS,MOS, and MS,BJI having the lowest standard deviations, while ML,IDC showed the highest standard deviation. Other magnitude types ranked differently depending on regression type. An examination of the residuals showed a linear model was appropriate for most magnitude types, with the exception of ML,KMA and ML,IDC. Residuals suggested a bilinear model worked well for ML,KMA, while ML,IDC showed a monotonic trend.

Keywords

• moment magnitude
• South Korea
• magnitude homogenization
• engineering seismology