为了分析测段数量对相对重力仪性能试验的影响,对2021—2024年4台CG-6型和4台BURRIS型相对重力仪的性能试验数据进行处理,选取2~9段段差计算动态精度和3种仪器组合数的一致性中误差。发现CG-6型、BURRIS型相对重力仪动态精度的均值分别为(1~3)×10-8 m/s 2、(4~16)×10-8 m/s 2;3台仪器组合较6台仪器组合的一致性中误差更容易满足限差。剔除读数异常的仪器干扰后进一步分析发现,测段数量与相对重力仪的性能试验结果密切相关。随着测段数量的增加,动态精度和一致性中误差结果会逐渐趋于稳定;当测段数量为5~7段时,各台仪器的动态精度和多台仪器一致性中误差达到峰值,之后逐渐减小或保持稳定。
通过对恩施地震台、钟祥地震台、麻城地震台的面波震级与中国地震台网的发布震级进行震级偏差分析,结果表明,恩施地震台的面波震级与中国地震台网的发布震级一致性更好;作为优先发布震级时,钟祥地震台优选Ms震级,麻城地震台优选Ms7震级,恩施地震台Ms震级和Ms7震级都可以。恩施地震台、钟祥地震台、麻城地震台的Ms震级和Ms7震级偏差受震级大小、震中距的影响不大,麻城地震台Ms震级对于WWS向(225˚ ≤ α Ms、Ms7震级对深源地震的映震能力均较差。The difference between the surface wave magnitude of Enshi Seismic station, Zhongxiang seismic station and Macheng seismic station and the published magnitude of China seismic network is analyzed. The results show that the surface wave magnitude of Enshi seismic station is in better agreement with the published magnitude of China seismic network;As the priority to release the earthquake magnitude, the Zhongxiang seismic station preferably Ms magnitude, Macheng seismic station preferably Ms7 magnitude, Enshi seismic station Ms magnitude and Ms7 magnitude can be. The difference between Ms magnitude and Ms7 magnitude of Enshi Seismic Station, Zhongxiang Seismic Station and Macheng Seismic Station is not affected by magnitude and epicentre distance. The Ms magnitude of Macheng seismic Station has poor seismic mapping ability for seismic events in the WWS direction (225˚ ≤ α Ms and Ms7 magnitudes of the Enshi, Zhongxiang and Macheng seismic Station have poor mapping ability to deep source earthquakes.
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