【摘要】 通过１６年（１９８０－１９９５年）中国地震台网对极远震记录资料分析后的结论是：Ｐ波衍射波Ｐｄｉｆ在中国台网的记录上震中距范围可达到１００°－１５８°附近，最低震级可在５．６级；佘山台的记录范围比全国台网窄些，而且对地区的灵敏度较大。结论说明我国地震台网对Ｐｄｉｆ震相的记录范围比理论值广，亦对台站速报和台站测震分析起一定作用。更多还原

【Abstract】 This paper analysed the data of very teleseisms recorded in Chinese seismic stations during the last 16 years(1980-1995)and came to the conclusion that the recorded distance for the diffraction wave Pdif of wave P is. about 100°-158°. The recorded least magnitude b 5. 6. In the Seismic Station of Shanghai , the recorded region is narrow , but it is very sensitive to re- gion. The conclusion is that the recorded distance of Pdif in Chinese seismic stations would be larger than that of theory. This result is very usefull for earthquake analysis.更多还原