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选用了兰州地震台大震速报仪器 DK- 1中长周期记录仪记录到的 1990年 1月～ 1999年 3月的大震速报地震共 5 44个 ,与中国地震局分析预报中心编纂的《中国地震速报台网观测报告》给出的震级比较 ,对兰州地震台 DK- 1地震仪测定的面波震级 (Ms)进行了对比和分析研究。结果认为兰州地震台大震速报 DK- 1地震仪测定的面波震级(Ms)偏差与震中距离、震中区域及地震大小有关。给出了不同震中距离、不同震级范围及不同地区发生地震的面波震级台基校正值 ,供在今后的速报工作中参考使用 ,将有助于提高兰州台大震速报的震级测定精度。
A total of 444 earthquakes were recorded from January 1990 to March 1999 recorded by the DK-1 medium-long period logging instrument of the Lanzhou Seismic Station for Large Seismograph, which was compared with the “ China Earthquake Quotations Network observation report ”gives the magnitude comparison, the Lanzhou Seismic Station DK-1 seismometer surface wave magnitude (Ms) were compared and analyzed. The results show that the deviation of surface wave magnitude (MS) measured by DK-1 seismograph of Lanzhou Seismic Station is related to epicentral distance, epicenter area and the magnitude of earthquake. The correction values of surface wave magnitudes of different earthquakes with different epicenter distances, different magnitudes and different earthquakes are given for reference in the future quick report work, which will be helpful to improve the magnitude determination precision of the Lanzhou - Taiwan earthquake.