选取海拉尔地震台2017年8月1日至2021年12月31日记录到的全球MS≥5.5且波形清晰的734个地震事件，比较海拉尔地震台测定的面波震级MS与中国地震台网中心发布的正式目录中面波震级MS之间的震级偏差。在震级、震源深度、震中距、方位角、地区等方面分析海拉尔地震台出现面波震级偏差的原因。结果表明，海拉尔地震台面波震级偏差较大，较中国地震台网中心正式目录的面波震级偏小约0.4级；震级越大，震级偏差越小；震源深度越深，震级偏差越大；当震中距为60°—105°时，震级偏差较大；方位角为东南方向时，震级偏差较大。比较海拉尔地震台测定的面波震级MS与矩震级MW后发现，震级偏小约0.43级。
A selection of 734 global earthquake events with magnitude greater than 5.5 and clear seismic waveforms recorded by the Hailar Seismic Station from August 1, 2017 to December 31, 2021 Were taken to compare the magnitude deviations between the surface wave magnitude (MS)measured by Hailar Seismic Station and those released by the China Earthquake Networks Center. The reasons for the deviations in surface wave magnitudes at the Hailar Seismic Station were analyzed in terms of magnitude, focal depth, epicenter distance, azimuth angle, and region. The results show that the Hailar Seismic Station has a relatively large deviation in surface wave magnitude, being approximately 0.4 magnitudes smaller than the surface wave magnitudes released by the China Earthquake Networks Center. The larger the magnitude, the smaller the deviation; the deeper the focal depth, the greater the magnitude deviation; when the epicentral distance is between 60° and 105°, the magnitude deviation is large; when the azimuth is in the southeast direction, the magnitude deviation is large. After comparing the surface wave magnitude (MS)determined by the Hailar Seismic Station with the moment magnitude (MW), it was found that the magnitude is approximately 0.43 levels smaller.
2023,44（4）: 27-33 收稿日期：2022-11-18
DOI：10.3969/j.issn.1003-3246.2023.04.005
基金项目：内蒙古自治区地震局局长基金（项目编号：2022JC12）
作者简介：吴桐(1997-),女,助理工程师,主要从事地震监测工作。E-mail:1498971840@qq.com
*通讯作者：王西(1996-),男,助理工程师,主要从事地震监测工作。E-mail:973844978@qq.com
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