摘要
四川汶川系列地震距太原基准地震台约1000 km,介于近震与远震之间,震相特殊,识别困难。本文通过对汶川主、余震和四川其他地区远震波形的对照,及对主要震相周期、幅度及波形特点的分析,认为PN、SG两个震相是太原地震台记录四川汶川地震的主要定位震相。
Wenchuan earthquakes, in Sichuan Province, occurred about 1 000 km away from Taiyuan Seismic Station. Since the epicenter distance is in the middle point of near shock and distant shock, the phases are hard to be identified. In this paper, we compare the waveform of main shock and after shocks of Wenchuan earthquake with those of other teleseismic earthquakes occurred in Sichuan Province, and analyze the characteristics of period, amplitude and waveform of main phases. We found that the PN and SG phases are the main phases which can be used for the location of Wenchuan earthquake in Taiyuan Seismic Station.