【摘要】 在北京地震台NCDSN宽频带地震图集编辑工作中,发现Pn波在远至震中距16.8°的地震中仍然作为初至波被清晰记录,而PnPn波则延续至震中距30°左右仍以非常明显的震相特征被记录下来。更多还原

【Abstract】 During the work of making the typical seismic atlas of the broadband seismic record of NCDSN Beijing Seismic Station,we found the first arrival phase that recorded in the far distance of epicenter 16.8°earthquake was still the Pn,and the phase PnPn as the obvious characteristic semismic phase was recored continuously to the distance of epicenter about 30°.In this paper,it tries to show and prove the characteristics and the existence evidences of the teleseismic Pn and PnPn,and also tries to explain the reasons of the PnPn amplitude is much larger than the Pn amplitude several times.更多还原