攀枝花地震台面波震级的改正值测算

Correcting value calculation for surface wave magnitude in Panzhihua seismograph station

选取了攀枝花近5年中763、DK-1地震仪记录较好的地震资料,用不同方法测算了地震台的面波震级台站改正值。经分析对比,认为“按震中距分段”计算得到的结果最好。列出了根据震中距求取面波台站改正值的实用简表,并用1999年2月763仪记录的41个地震、1999年1-8月DK-1仪记录的26个速报地震予以检验,地震震级准确率有明显提高。

Using the data of seismological records about 5 years recorded relatively well by the seismic instrument type 763, DK - 1 in Panzhihua Standard Seismic Station, we calculate the correcting values for surface wave magnitude with different methods. Through the compare studies, the correcting value is better got from the method which the epicenter distance are segmented into several sections. A practical table for surface wave magnitude determination according to the different epicenter distance is given out. At last we test the table with 41 earthquake records in the period of February 1999 by 763 seismic instrument and 26 earthquake records in the period of January to August 1999 by DK -1 seismic instrument.