. The Earth beneath the sea : History . ft^hf^mV^ftf^ 0400 05 ^fmm^im'^tMmttiim 10 n(i^>»w^<^Wh |5 «W^^*MV Fig. 11. Honolulu seismograms of a shock in the Gulf of Alaska. Long-period Love waves begin on the east-west at about 0401 h and at 0402 h change into waves of almost constant short period which persist for many minutes. Rayleigh waves begin on the north-south and vertical at about 0402 h. At about 0405 h there is an abrupt increase in the dominant frequency as the short-period train begins on the latter components as well. A dispersion analysis of these seismograms is given in Fig
. The Earth beneath the sea : History . ft^hf^mV^ftf^ 0400 05 ^fmm^im'^tMmttiim 10 n(i^>»w^<^Wh |5 «W^^*MV Fig. 11. Honolulu seismograms of a shock in the Gulf of Alaska. Long-period Love waves begin on the east-west at about 0401 h and at 0402 h change into waves of almost constant short period which persist for many minutes. Rayleigh waves begin on the north-south and vertical at about 0402 h. At about 0405 h there is an abrupt increase in the dominant frequency as the short-period train begins on the latter components as well. A dispersion analysis of these seismograms is given in Fig. 13. verse as in Fig. 12. Sometimes long-period waves are recorded on the longitudi- nal and vertical components and short-period waves on the transverse, as in the seismograms of Fig. 10. Furthermore, the beginnings of the wave trains on the transverse component usually have longer periods and precede the short- period train on the other two components, as in Fig. 11. When observable, the periods are always about the same on all three comj^onents at the same time, but particle motion is ajjparently not coherent, the relative phases between
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