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地震波在地球表面的反射波PP、SS由于需经地球表面的一次反射,因此属于远震记录观测到的震相。本文利用井下摆观测数据,对2003年吉林松原震群和2005年黑龙江林甸地震震相进行认真研究,根据台站附近的测井资料确定的上地壳速度模型,对选定的地表反射点进行地震波的走时计算,初步判定在特定的震中距内井下摆可以记录到地方震的地球表面反射波。为和远震记录的PP和SS震相相区别,本文暂定此震相为PgPg,SgSg。
Seismic wave reflection on the Earth’s surface PP, SS due to the need to be a reflection of the Earth’s surface, and therefore belong to the observed teleseismic phase. In this paper, we use the downhole observation data to study the Songyuan earthquake swarm in 2003 in Jilin Province and the seismic phase of Lindian earthquake in Heilongjiang in 2005. According to the upper crustal velocity model determined by the well logging data near the station, the selected surface reflection point The travel time of seismic waves is calculated, and it is preliminarily determined that the reflected waves at the surface of the earth can be recorded at a specific epicentral distance. For the difference between the teleseismic records of PP and SS phases, the tentative phase of this paper is PgPg and SgSg.