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在１９７６ —１９８３ 年期间， 格陵兰地区共记录到５３ 个３ ～５ 级地震， 确定了所有的地震参数， 分析了２９ 个地震的震相到时， 得到了该地区Ｐｎ ， Ｐｇ， Ｐ１１ （ＰＭＰ） ， Ｓｎ 和Ｌｇ 震相的走时曲线及其视速度值， 该结果与加拿大走时曲线相一致。发现一部分地震图上在直达波Ｐ与Ｓ之间记录到一个附加的震相—ｉ， ｉ 震相的存在与震中距， 震源深度有关。初步的物理解释是：ｉ 震相可解释成为（Ｐｓ） 或（Ｓｐ） 转换波。该转换波发生在台站下面的低速松散沉积层的底部。
During the period from 1976 to 1983, a total of 53 M5 ~ M5 earthquakes were recorded in Greenland and all the seismic parameters were determined. Pn, Pg, P11 (PMP) in this area were obtained when the seismic phases of 29 earthquakes were analyzed. , Sn and Lg seismic facies travel time curve and its apparent velocity value, the result is consistent with the Canadian travel time curve. It is found that on some seismograms, an additional phase-i is recorded between the direct waves P and S, and the existence of phase i is related to epicenter distance and source depth. The first physical explanation is that the i-phase can be interpreted as a (Ps) or (Sp) converted wave. The converted wave occurs at the bottom of the slow loose sediment beneath the station.