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以国家地震台网测定的面波震级为标准,利用福建区域数字地震台网测定的近距离面波震级MS结果与国家地震台网测定的面波震级结果进行比较和统计分析。根据两者之间的相对差量,主要从数据采集器的最大动态放大倍数分贝数、FBS3宽频带反馈式速度平坦型地震计的幅频特性和测定面波震级展开公式推导3方面进行分析。结果表明震中距Δ、数据采集器的动态范围和地震计记录地面运动振动频率的有效频带宽度是影响面波震级测定的主要因素,进而提出适合于福建区域台网测定近距离面波震级MS的台基校正值及标准偏差。
Taking the magnitude of surface wave measured by National Seismograph Network as the standard, the results of near surface wave MS measured by Fujian Provincial Digital Seismic Network and the surface wave magnitude measured by National Seismograph Network were compared and statistically analyzed. According to the relative difference between the two, the paper mainly analyzes the amplitude-frequency characteristics of FBS3 wide-band frequency-response flatness seismometer and the formula of derivation of surface wave magnitude deduced from the maximum dynamic magnification decibels of data acquisition. The results show that the epicenter distance Δ, the dynamic range of the data collector and the effective frequency bandwidth of the seismometer to record the ground motion vibration frequency are the main factors affecting the surface wave magnitude measurement. Then, it is suitable for the determination of the short range surface wave MS in Fujian Province Base correction and standard deviation.