ON SEISMOLOGICAL INVESTIGATION. 203 
‘The first shock happened at 10.50 p.m. (July 24, 3h. 16m. 30s. a.m. 
G.M.T.) lasting 50s., with an oscillation of 10 centimetres, direction 
south-east to north-east, followed by lesser shocks, which continued alto- 
gether for twelve hours, and the sea having receded fears were enter- 
tained of a tidal wave. 
‘ The winter throughout Chile has been unusually severe and wet, the 
rainfall in May and June having amounted to 22 inches. Seismic 
disturbance has been frequent, especially in the neighbourhood of the 
Andes, where abnormal quantities of snow have fallen. In several passes 
of the Cordillera snow has attained the extraordinary depth of from 14 to 
18 metres, and postal communication has been entirely stopped vid the 
Andine route for close on two months, many hundred bags of postal 
matter having been abandoned in the snow by the carriers, several of 
whom lost their lives whilst performing their perilous duties. 
‘On the 12th inst. snow fell heavily in Santiago, a very unusual 
occurrence, to a depth of between 2 and 3 inches: indeed for twelve 
hours the capital presented the appearance of a city of Northern Europe. 
‘Valparaiso suffered considerable Gamage from inundation in the 
early part of this month, caused by excessive rainfall, which was followed 
by shocks of earthquake and a severe cyclone, causing considerable destruc- 
tion to property.’ 
No, 225, August 8. 
EM) Se M. S. H. M.S. 
Shide . 8 53 30 = 9 50 
Nicolaiew S 2040 190 8 54 0 
Potsdam & 9 0 — 8 45 0 
No. 228, August 21, 
H. M. S. 
Shide . ; ; : : ; : ‘ : : 5 17 28 0 
Bidston C j A 3 . : 3 : c C 16 50 0 
The identity of these shocks is doubtful. 
No. 230, August 51. 
Heys 1S. MM. Ep Mima 
Shide j : ‘ ; é ee ZOO 5to6 20 36 25 
Kew . 5 , : A - = 204s 8 20 35 0 
Nicolaiew . : i ‘ A - 2039 O — 20 42 0 
Rocca di Papa . : : : - 20 3 40 — 20 31 O 
Ischia : : : ; j . 20 “3 45 == 29 30 0 
Catania ; é A 3 ‘ a 20s G3) — 20 12 33 
Toronto . F z ‘ : . 2017 53 — 21.3 20 
Batavia .. ‘: : : : Pa 2.0) LS — — 
Madras : ‘ F : 3 eee — 20 28s. .0 
Potsdam . P <e 2008" — —— 
San Fernando (recorded) . ; j — — — 
At Shide the first P.T.’s lasted about 6 minutes, after which they 
increased and decreased sometimes gradually and sometimes suddenly 
up to 20h. 3lm. 21s. The maximum was attained at 20h. 36m. 25s., to 
be followed by its echo of nearly equal magnitude at 20h. 42m. 29s. 
Following this there were fairly symmetrical sets of earthquake followers. 
(See Earthquake Echoes, p. 227). The period of the P.T.’s reached 12s., 
and that of the L.W.’s 15:-4s. The maximum amplitude was 9 mm., 
indicating tilting of 5’’-4. 
