68 REPORTS ON THE STATE OF SCIENCE.—1914. 
for the different groups was found to be nearly constant at about 8 s. 
Since the coefficient (8 units of 0-1m.) means 48 s., we may take it that 
the epicentre is about 6° wrong. As regards direction, note that the 
observed times for receiving stations on the side of the epicentre remote 
from Pulkovo are too small; so that the epicentre must be moved nearer 
to them and further from Pulkovo. The observed S—P at Pulkovo, viz. 
10 m. 24 s., does not correspond (as indicated by the present tables) to an 
epicentral distance of 83°-5, but to a distance of 89°:-5. 
Turning to §, we find the average value of 1° to be about 13.8. The 
first harmonic of 8 thus indicates a displacement of 48°/13 or 3°-7. We 
may regard this as a satisfactory confirmation of the magnitude of the 
error, which may be put at about 5°. 
The second harmonics in both cases are small, and the phases are 
quite discordant. We may fairly say that there is no evidence of a varia- 
tion in velocity of an elliptic type. 
As regards other earthquakes analysed for azimuth the following 
notes will suffice :— 
1913, March 14. Epicentre 11° N., 123° E., distant 82° from Pulkovo. 
Of nearly same type as that of 1913, January 11, but distribution of 
stations not so good. The numbers in the 30° divisions for P are 
‘Mes Ti ls | Se Fate anes Wen Gai: Sie, 255 5) 
and the harmonic expression is (in units of 0-1 m.) 
+ 0-2 + 5-0 cos (A — 302°) + 4-0 cos 2 (A — 36°). 
For § the number of stations are 
1-3-0006 0 O30 2 
and the harmonic expression is 
—- 7-8 + 14-5 cos (A — 345°) — 4-2 cos 2 (A — 7°). 
In spite of the broken nature of the series, the indication of 
an error of about 4° or 5° in A is tolerably plain. The azimuth 
of Pulkovo is 330°, and the magnitudes of the displacement assigned 
by the P observations may be put at 30°/8 = 3°.8. 
» § ” . . S73 = 6 1. 
There is some indication of a second order term, but it cannot be 
regarded very seriously. 
1913, March 23. Epicentre 26° N., 143° E., distant 78° from Pulkovo. 
The only available observations between azimuths 0° and 210° are 
two Milne observations of P and one Milne of 8. There seems no 
advantage in making even a rough estimate. 
1913, April 30. Epicentre 50° N., 176° E., distant 67° from Pulkovo. 
Number of observations in the separate groups 
for P 4 2-0/0 2°)..0 0.3 13 oe 
for § to AO Ot 0 0 1 2 a 
