The Conversion Relationship between the Local Earthquake Magnitude and Surface Wave Magnitude in the Inner Mongolia Digital Seismic Network

Using 116 earthquakes over M3.8 in the Inner Mongolia region from 2008 to 2015, the local earthquake magnitude Mand surface wave magnitude Mare remeasured. Based on norm linear regression(SR1 and SR2) and norm(OR) orthogonal regression method, we established the conversion relationship between Mand M. The results were tested with Gaussian disturbance. The result shows that the orthogonal regression method(OR) result has the best fitting curve, and the conversion relation is M=0.96 M-0.10. The difference between our result and Guo Lücan’s(M=1.13 M-1.08) may be caused by regional tectonic characteristics. Mvalue is significantly higher than the Mvalue, with an average difference of 0.23, the difference distribution of empirical relation and the rectified relation is in the range of 0.2-0.3.