466 



Commander W. B. Pauli. 



[Feb. 17, 



"At 10 h.* 40 m. p.m., the second, and very severe repetition took 

 place, which, although of great violence, presented peculiarities distinct 

 from the others ; in those preceding, it was observed that the strongest 

 focus of seismic radiation was in the second quadrant ; in this latter it 

 began, it is true, in the east, but with much less intensity than before ; 

 and the focus observed in the first quadrant continued with the same 

 and even greater violence (see fig. 4). In this we perceive that the 



Fig. 4. 



oscillation from east to west, true, has an amplitude of 10° 5' to the 

 east, and 5° to the west ; whereas, in the direction from north-east to 

 south-west it comprises an arc of 17° : 9° to south-west, and 8° to 

 north-east. 



" The vertical seismometer marked 28 millims. Vibrations continued, 

 but decreasing in frequency and above all in force. 



" The pendulum, which had never been at rest since the 18th until 

 3 p.m. of the 21st, in three succeeding days had long intervals of 

 complete immobility. On the 25th, at 4 h. 2 m. a.m., another slight 

 shock was felt ; this, although of small intensity, we have faithfully 

 transmitted to paper, because, in our opinion, it is important to show 

 the gradual change of focus of seismic radiation during the whole 

 time. The direction of the undulation was from E. 26° K to W. 26° S., 

 and only reached a total amplitude of 3° 45'. The movement of trepi- 

 dation was inappreciable, as the index of the vertical pendulum 

 departed only 0*7 millim. from its normal position. 



