收集了广东地震台网记录的地震资料，根据Richter提出的原始ML震级定义，分别采用了频率域和时间域2种仿真技术将宽频带速度波形仿真为伍德-安德森地震仪波形，在仿真后的波形上自动量取地震水平向最大振幅，研究获得了广东地区近震ML震级的量规函数。通过对各台站计算的ML震级残差的统计分析，获得了广东地震台网44个台站的台站校正。对台站校正的Z检验结果表明，44个台站中有38个台站的台站校正明显不为0。新量规函数以及台站校正的应用，有效提高了广东地震台网测定ML震级的精度，使ML震级测定的离散程度降低约30%。

According to the local magnitude definition by Richter，we collected local earthquake data recorded by the Guangdong Digital Seismic Network and measured the maximal amplitude on simulated Wood-Anderson seismograms of the broadband seismograms，which were simulated in frequency and time domain respectively. Using these two kinds of data，two calibration functions of the local magnitude scale for Guangdong region have been obtained. The correction of the 44 seismic stations of the Guangdong Digital Seismic Network has been calculated by analyzing the ML residuals for each station. Using a Z-test，we found that the correction of 38 stations was significantly different from 0.The application of the new local magnitude scale and station correction，the overall variance of the mean magnitude estimates have been reduced by 30%.

中国地震局监测预报司测震台网青年骨干培养专项(20130213)资助