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通过对2008年1月至2013年9月期间福建台网记录的台湾地区1257个地震的近震震级偏差进行统计分析,研究了台湾地区近震震级偏差的影响因素。在比较震级残差法和最大振幅衰减曲线法后,选用最大振幅衰减曲线法拟合得到福建台网适用于台湾地区的量规函数,并用震级残差法得到了相应的台站校正值和介质传播方向校正值。这不仅减小了近震震级的离散度,而且使闽台两地震级标度趋于一致。然后将研究成果应用于首台近震震级的校正,首台震级经过校正后可以快速测得偏差较小的近震震级,为地震预警震级的确定打下了基础。
Through the statistical analysis of the epicenter magnitude deviations of 1257 earthquakes recorded in Fujian Province from January 2008 to September 2013 in Taiwan, the influencing factors of the magnitude of the near earthquakes in Taiwan are studied. After comparing the magnitude residual method with the maximum amplitude attenuation curve method, the maximum amplitude attenuation curve method was used to fit Fujian gauge network to Taiwan’s gauge function, and the corresponding station correction value and media propagation were obtained by the magnitude residual method Direction correction value. This not only reduces the dispersion of near-earthquakes magnitude, but also makes the magnitude scales of Fujian and Taiwan converge. Then, the research results are applied to the first correction of near-earthquakes magnitude. After the first magnitude is corrected, the near-earthquakes with small deviations can be quickly measured, laying a foundation for the determination of magnitude of earthquake warning.