利用重庆地震台网P波记录测定MWP震级

选取2010-2016年重庆地震台网记录的M_S>3.0地震，对P波进行波谱分析，得到P波零频极限值、地震矩及拐角周期，拟合得到拐角周期与重庆地震台网M_S的关系、P波零频极限值与重庆地震台网M_S的关系，利用P波地震矩计算矩震级M_WP，分析M_WP与M_S的差异。结果显示，当M_S ≤ 4.0时，M_WP > M_S；当M_S > 4.0时，M_WP < M_S，对得到的震级计算关系式检验发现，P波矩震级及通过零频极限计算得到的震级与重庆地震台网M_S较为接近，而通过拐角周期计算得到的震级与M_S相差较大。

MWP magnitude calculated with P wave records in Chongqing Seismic Network

Using the earthquakes with M_S>3.0 recorded in Chongqing Seismic Network since 2010 to 2016, the amplitude and cycle information, namely the long-period spectral level and the moment and the corner cycle of P wave are gotten through spectrum analysis. The relation between the corner period of P wave and the M_S, and the relation between the long-period spectral level of P wave and the M_S are obtained. The M_WP is calculated through the P wave moment. The difference between M_WP and M_S is analyzed. The results show that the M_WP is larger than M_S when M_S ≤ 4.0, and the M_WP is smaller than M_S when M_S>4.0. The results of hypothesis testing show that the M_WP and the magnitude calculated from the long-period spectral level of P wave is relatively close while the magnitude calculated from the P wave corner cycle is in large difference.