188 
PACIFIC SCIENCE, Vol. I, July, 1947 
TABLE 1 
Comparison of Observed and Computed Travel Times of Seismic Sea Waves 
(Mean variation of computed travel times with respect to observed times — 2.3 per cent.) 
EARTHQUAKE 
LOCATION 
OF 
TIDE GAGE 
OBSERVED 
TRAVEL 
TIME 
TIME 
DIFFERENCE 
(COMPUTED 
MINUS 
observed) 
Epicenter 
Greenwich Time 
Near 
Lat. 
Long. 
Year 
Month 
Day 
Hour 
deg. 
deg. 
h. m. 
h. m. 
min. 
Colombia 
1 N.. 
80 W. 
1906 
Tan. 
31 
15 33 
Honolulu 
12 57 
—27 
Chile 
33 S. 
72 W. 
1906 
Aug. 
17 
00 41 
Honolulu 
15 12 
— 2 
Kermadec Is. 
29.2 S. 
177.0 W. 
1917 
May 
1 
18 27 
Honolulu 
8 01 
— 6 
Kuril Is. 
46.5 N. 
151.4 E. 
1918 
Sept. 
7 
17 16 
Honolulu 
6 36 
+ 4 
Tonga Is. 
21.2 S. 
172.5 W. 
1919 
April 
30 
07 17 
Honolulu 
6 36 
— 4 
Chile 
29.0 S. 
71.0 W. 
1922 
Nov. 
11 
04 32 
Honolulu 
14 58 
+ 2 
Kamchatka 
54.0 N. 
161.0 E. 
1923 
Feb. 
3 
16 02 
Honolulu 
6 18 
+ 6 
Kamchatka 
55.7 N. 
162.5 E. 
1923 
April 
13 
15 31 
Honolulu 
6 44 
— 8 
California 
34.9 N. 
121.0 W. 
1927 
Nov. 
4 
13 51 
Hilo 
5 08 
— 3* 
Mexico 
16.2 N. 
97.2 W. 
1928 
June 
17 
03 19 
Hilo 
8 30 
0* 
Aleutian Is. 
51 N. 
170 W. 
1929 
Mar. 
7 
01 35 
Hilo 
4 45 
— 9=’.: 
Solomon Is. 
10.6 S. 
161.7 E. 
1931 
Oct. 
3 
19 13 
Honolulu 
7 46 
—11 
Solomon Is. 
10.6 S. 
161.7 E. 
1931 
Oct. 
3 
19 13 
Hilo 
8 19 
—29* 
Mexico 
19.2 N. 
104.2 W. 
1932 
June 
3 
10 37 
Honolulu 
7 42 
+ 13 
Japan 
39.1 N. 
144.7 E. 
1933 
Mar. 
2 
17 31 
Honolulu 
7 33 
—I4f 
Alaska 
55.5 N. 
157.3 W. 
1938 
Nov. 
10 
20 19 
Honolulu 
5 01 
— 1 
Chile 
31.5 S. 
71.4 W. 
1943 
April 
6 
16 07 
Honolulu 
15 31 
—24 
Japan 
33 N. 
137 E. 
1944 
Dec. 
7 
04 36 
Honolulu 
9 09 
—49f 
Aleutian Is. 
53.5 N. 
163.0 W. 
1946 
April 
1 
12 29 
Honolulu 
4 34 
— 4 
Japan 
33.5 N. 
133.7 E. 
1946 
Dec. 
20 
19 19 
Honolulu 
9 32 
—23f 
* Computed times to Hilo were estimated with the aid of near-by time curves, 
t See text for a discussion of these differences. 
in the Hawaiian Islands, the observed travel 
time, and the difference between computed 
and observed travel times. The computed 
travel times to Hilo were estimated with the 
aid of near-by time curves. A number of 
other seismic sea waves have reached the 
Hawaiian Islands and the available mari- 
grams were examined. These were not in¬ 
cluded in the table because the amplitudes, 
as recorded by the gages, were too small to 
permit the determination of the first rise or 
fall of the waves. The natural seiche con¬ 
dition at both Honolulu and Hilo was the 
primary reason for this difficulty. 
REFERENCES 
Bodle, R. R. Note on the earthquake and seismic 
sea wave of April 1, 1946. Amer. Geophys. 
Union Trans. 27: 464-465, 1946. 
British Association for the Advancement 
of Science, Comn. on Seismol. Invest. Rpt. 
(through 1917); Internatl. Seismol. Sum. (from 
1918 ). 
Green, C. K. Seismic sea wave of April 1, 1946, 
as recorded on tide gages. Amer. Geophys. 
Union Trans. 27: 490-500, 1946. 
Heck, N. H. List of seismic sea waves. Union 
Geodesique et Geophysique Internatl., Ann. 
Com. pour l’Etude des Raz de Maree, no. 4: 
20-41, 1934. 
International Seismological Summary. See 
British Association. 
Jaggar, T. A. The great tidal wave of 1946. Nat. 
Hist. 55: 263-268, 1946. 
Macdonald, G. A., F. P. Shepard, and D. C. 
Cox. The tsunami of April 1, 1946, in the Ha¬ 
waiian Islands. Pacific Sci. 1: 21-37, 1947. 
Powers, H. A. The tidal wave of April 1, 1946. 
Volcano Letter (Honolulu), no. 491: 1-4, 1946. 
United States Coast and Geodetic Survey. 
Manual of tide observations, iv + 92 p., 1 pi. 
Spec. Pub. 196, Washington, D. C., 1941. 
- United States earthquakes, 1939. iii + 69 
p., 1 pi. Serial 637, Washington, D. C., 1941. 
- United States earthquakes, 1943. iv + 49 
p., 2 pi. Serial 672, Washington, D. C, 1945. 
- United States earthquakes, 1944. iv + 43 
p., 2 pi. Serial 682, Washington, D. C., 1946. 
