162 REPORT—1890. 
| owe Double 
No. Month | Date Time | Duration Direction nea an Ainplitude 
conds et 
in mm. 
991 XII. 26 8 14 11 P.M. — — very slight 
992 5 28 10 17 68 P.M. 15 E.-W. 0°3 05 
993 45 29 11 10 19 A.M. — — sli ght 
994 hi 31 1 5 13 PM. 520 | ES.E.-W.N.W. 2°8 
vertical motion | sli ght 
1890. 
995 16 7 7 47 37 A.M. 0 40 S-N. slight 
996 a Xo 3 43 25 P.M. 5 0 S.E.-N.W. 3:0 " 
997 PA 12 4 15 33 a.m. _ -- very slight 
998 9 29 1128 3 P.M. 0 57 E.-W. 07 0" 
999 FA 30 8 35 31 A.M. — oo very slight 
1,000 LO 13 9 48 16 P.M. 0 30 E.-W. 02 02 
1,001 ay 18 5 31 10 A.M. — — sli ght 
1,002 a 5 950 6 A.M. = = sli ght 
1,003 3 21 2 44 13 a.m. 0 40 E.-W. slight 
1,004 a 24 047 2am. 0 30 S.E.-N.W, 08 0-2 
1,005 III. if 4 21 42 a.m. 0 20 E.-W. 0-4 0:2 
1,006 a 11 11 7 2am. 0 30 =e sli! eht 
1,007 * *) 7 53 49 P.M. 1 0 | ES.E-W.N.W. 0-2 04 
1,008 = 18 316 4 P.M. 0 20 — — slight 
1,009 33 26 6 57 55 A.M. = = — slight 
1,010 a 28 2 22 37 P.M. — — —  silight 
1,011 IV. 5 020 0 PM. —_ — — slight 
1.012 + 11 3 8. 2am. Oa) E.-W. 0-3 0-4 
1,013 ie 16 9 34 47 P.M. a0 S.E.-N.W. 2-9 22-4 
vertical motion 06 0'2 
1,014 re) ay 1140 3 PM. — — sli ght 
1,015 es 17 4 56 45 A.M. 8 0 8.E.-N.W. 3°8 78 
vertical) motion sli ght 
1,016 7” is Hibl Beas = = sli!ght 
1,017 5 5 6 42 36 aM. 6 30 §.E.-N.W. a4 3°3 
1,018 5 5 3 31 38 PM. _— - sli ght 
1,019 5, 3 10 25 15 P.M. 3 36 $.E.-N.W. 2°5 12 
1,020 Ff 18 5 38 37 Pm. — — slight 
1,021 5 = 7 15 57 pM. —_ —_— sli ght 
1,022 95 % ll 3} 0 pM. = — slight 
1,023 ee 19 9 45 52 AM. os = slight 
1,024 on “4 1 7 37 PM. -- _— slight 
1,025 F 27 8 36 48 P.M. = = sli ght 
In the preceding list the most remarkable earthquakes which I had 
the opportunity of observing were the series commencing on April 16, 1890, 
at 9h. 34m. 47s. p.m. This disturbance was felt along the eastern coast 
of Japan from lat. 38°N to the bay of Owari in the south—a distance of 
about 300 miles. It extended inland across the backbone of the country 
as far as Nagano. The land area shaken was 4,743 square ri (1 sq. 
ri = 5°9 sq. miles). The origin appears to have been to the west of 
Miyakijima, where about 70 shocks were felt and buildings damaged, 
about 100 miles 8.S.W. from Tokio in the Pacific Ocean. The period of 
the large waves was nearly 3 seconds and the duration 7 minutes. After 
sensible motion had ceased, which lasted from 2 to 3 minutes, I was 
standing watching one of my seismographs, which every few seconds gave 
fitful movements, some of which were large enough to swing the pointers 
off the recording surface. These movements were far too slow to sup- 
pose them to be in any way connected with the inertia of the heavy 
masses constituting the bobs of the horizontal pendulums. In my opinion 
the movements were not due to sudden horizontal impulses, but to gentle 
and irregular tiltings of the instrument. It was in fact as if we were on 
a huge raft, beneath which waves of a very long period were passing. 
No movement could be felt. 
The earthquake at 4h. 56m, 45s. a.m. next morning lasted eight minutes, 
