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The April 20,2013 Lushan earthquake which occurred in Sichuan,China had only moderate thrust.However,the computed seismic moments(M0)for the Lushan earthquake calculated by several institutions differ significantly from 0.4 9 1019to 1.69 9 1019Nm,up to four times difference.We evaluate ten computed M0s by using normal mode observations from superconducting gravimeters in Mainland China.We compute synthetic normal modes on the basis of moment tensor solutions and fit them to the observed normal modes.Comparison of our results indicates that M0is the main cause for some large differences between observations and synthetics.We suggest that a moment magnitude of Mw6.6,corresponding to a M0of 0.97–1.08 9 1019Nm,characterizes the size and strength of the seismic source of the Lushan earthquake.
The April 20, 2013 Lushan earthquake which occurred in Sichuan, China had only moderate thrust. Effect of the computed seismic moments (M0) for the Lushan earthquake calculated by several cycles differ significantly from 0.4 9 1019 to 1.69 9 1019Nm, up to four times difference .We evaluate ten computed M0s by using normal normal observations from superconducting gravimeters in Mainland China. We compute synthetic normal normal modes on the basis of moment tensor solutions and fit them to the observed normal mode. Comparison of our results indicates that M0is the main cause for some large differences between observations and synthetics. We suggest that a moment magnitude of Mw6.6, corresponding to a M0 of 0.97-1.08 9 1019Nm, characterizes the size and strength of the seismic source of the Lushan earthquake.