Abstract:
We calculated the broadband surface wave magnitude
MS(BB), surface wave magnitude
MS and partial moment magnitude
MW of 217 earthquakes in China recorded by Sichuan Seismic Network from 2009 to 2016. The systematic comparison and analysis research of the results shows:the difference between
MS(BB) and
MS is -0.1~0.6, for 97% earthquakes,
MS is greater than
MS(BB). The orthogonal regression analysis result shows,
MS(BB) is about 0.27 less than
MS. The difference between
MW and
MS is -0.8~0.35, for 74% earthquakes, the difference between
MW and
MS is within ±0.3. Through orthogonal regression analysis, for 4.0 ≤
M ≤ 8.0 earthquakes
MS is greater than
MW, the deviation range from 0.1~0.4 and increase with magnitude increasing. The difference between
MW and
MS(BB) is -0.55~0.5, for 74% earthquakes, the difference between
MW and
MS is within ±0.3. By orthogonal regression analysis, for 4.0 ≤
M ≤ 5.0 earthquakes
MW is greater than
MS(BB), the deviation range from 0.1~0.13, for 5.0 ≤
M ≤ 8.0 earthquakes
MW is less than
MS(BB), the deviation within 0.23. On the whole,the difference between
MW and
MS(BB) is less than
MW and
MS. That is, because of closer to
MW, broadband surface wave magnitude
MS(BB) can more accurately evaluate the magnitude of earthquake.