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

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 M_W 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 M_W regressions. This resulted in M_W regressions from M_V,JMA, M_D,JMA, M_S,MOS, and M_S,BJI having the lowest standard deviations, while M_L,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 M_L,KMA and M_L,IDC. Residuals suggested a bilinear model worked well for M_L,KMA, while M_L,IDC showed a monotonic trend.