bes ON SEISMOLOGIOAL INVESTIGATIONS. 47 
_ continents. These numbers are reproduced on the accompanying map, 
and those which are underlined correspond to numbers in the catalogue 
_ which carry an asterisk (*). For a description of the methods by 
_ which the position of origins has been determined see British Asso- 
ciation Report, 1900, p. 79. When the time at which an earthquake 
_ originated is followed by plus or minus so many minutes, this means 
_ that there is a corresponding uncertainty as to the position of the 
origin. The names of places at which an earthquake has only been 
felt is followed by the letter F. If destruction has taken place it is 
followed by the letter D. The dotted lines on the map are the axes 
_ of troughs or ridges from which large earthquakes have originated. 
In the column for remarks I have made a few references to deter- 
mination of origins by other investigators. Those given by Prince 
Galitzin are of interest from the fact that they are made from observa- 
tions at a single station. The determinations by Dr. Kurt Wegener 
depend upon observations made at three to six stations.? 
In connection with my own observations, to make which I fre- 
quently had materials from 30 or 40 stations, it is interesting to 
_hote that these stations could sometimes be divided into groups, each 
_of which would give different epicentres, the distances between which 
might be as much as six degrees. One interpretation of this is the 
assumption that the earthquake originated over an area the dimension 
of which is indicated by the distances which separate the calculated 
epicentres. 
Lat. and long. 
u emarks. 
in degrees 
D=destructive 
C, 90 W. 24 N. | Wegener gives 82 W. 
25 N., time 11.2.26. 
Seismograms _ eyi- 
dently refer to two 
or three disturbances 
6 | 2200 | 19.5442 E, 125 KE. 25 N. | Ishigakijima, Loochoo, 
F 
R 
F=felt, 
8 | 2204 | 14.4842 K, 122 E. 35 N. | In Chili, Kwangsu and 
Shantung, F. 
15 | 2212 | 22.15 E, 125 FE. 5 N. Mindanao, Agusan 
Valley, F., also Hal- 
mahera and Talaud, 
2220 | 14.50+4 M, 180 E. 48. 
2225 | 8.48 J 19 W. 67 N. | Galitzin gives 17 W. 
68 N. 
2228 | 18.48ca Uy 55 W. 12 N. | St. Vincent, George- 
hs Paramaribo, 
- Y, 
2241 | 3.45ca F, 168 E. 338. | Probably a dual earth- 
uake. 
2247 | 16.34ca ¥, 168 E. 175. fae 
2248 | 14.0ca F, 168 EH. 178. | Lifu in Loyalty Is., 
- Wegener gives 
177 W. 18 S., and 
times 13.59.7, 
15.40.2, 17.36.5 and 
18.32.5. 
* Seo Bulletin del’ Académie des Sciences de St.-Pétersbour , No. 13, 1911, p. 954. 
2 See d. Kgl. Ges. d. Wiss. math.-phys. Kl. 1912, Heft 3. — Bal 
