SEISMOLOGICAL PHENOMENA. ail 
(2) E.Q. of 10.10.01, No. 6 on Strassburg list, October, 
1900, No. 4 on Hamburg list, October, 1900; 
origin in Alaska; observed also at Victoria, B.C., 
Toronto, and most European stations; began at 
Wellington 3 mins. before Scrassburg. 
(3) A series of tremors without marked shocks, but 
rapid, and of large amplitude, up to 13} mm., last- 
ing from 21 hrs. 41 mins. on 5.2.’01 to 15 hrs. 11 
mins. on 7.2.’01. 
It will be necessary that all available records of these 
and other evidently-identical shocks should be carefully com- 
pared before reliable conclusions can be drawn from them. 
Enough, however, has been recorded to show that com- 
parison will be possible for many earthquakes and series of 
tremors that travel round or through the crust. 
The instrument at Wellington gave a very complete list 
of observations for the recent earthquake (16th November, 
1901), at Cheviot, South Island, New Zealand. As shown 
by the seismograph, the maximum disturbances began sud- 
denly, and lasted for 2 mims.; the earthquake proper lasted 
for 11? mins., and the large vibrations for 594 mins. long. 
The amplitude cannot be exactly measured, but the mark- 
ings went right across the paper; so that the amplitude 
exceeded 40 mm. Shocks of slighter character and tremors 
lasted for several days, and at intervals there were slight 
shocks for a month afterwards. One of the most notable 
features of che earthquake was a tilt of the surface amount- 
ing to 4 seconds of arc nearly westwards (E W.), 3°6 
seconds of which took place at the time of the chief shock. 
Instrument No. 16, set up at Christchurch under the 
charge of Mr. Coleridge Farr, B.Sc., was not in going order 
until about the 20th November, sothat the principal Cheviot 
shock was not recorded by it. Afcer that time, however, 
it gave many records, several of which agree with those of 
the Wellington inswument. The magnetic instruments, 
especially the H.F. and V.F. instruments, gave records 
synchronous, or nearly so, with those of the seismographs. 
It should be stated that the Wellington instrument is in- 
stalled on rock, which, however, is much marked by cleavage, 
and the Christchurch imstrument on alluvial shingle. Both 
booms are in che meridian, with the free end pointing true 
north. 
Many changes of level have been exhibited by the Wel- 
lington instrument ;' some sudden, as in the case of the 
Cheviot shock ; others gradual or periodic, apparently. It 
is too early to speak with certainty as to the existence of a 
