








Remarks. 





N. E. 
Ewing seismograph by R. T. C. 
and S. E. 
Slight (about 10.~-). 
Not very perceptible, but stopt 
some clocks. 
Increasing intensity with prin- 
cipal disturbance near mid- 
dle of series. No clock stopt, 
rage Bae 
ete motion east-west. 
Two distinct vibrations from 
north to south. 
Felt by Mr. Legler at Pt. Reyes, 
with whom I was talking 
over telephone at the time, 
about 3 s. before felt in 
Farallones. J. A. Boyle. 
Ewing seismograph by R. T. C. 
and S. E. 
Slight tremor, followed in 
about 30 s. by hard shake 
of several seconds. Fully 
the fifth hard shake since 
5! 13", F. L. 
West-east. Apparent direction 
-east. Tremor 5s. after first 
shock, no noise. 
Moderate, A. G. McA. 
| at 
Distinctly felt on ground and 
caused falling of loose parts 
of buildings. 
Moderate, A. G. McA. 
Ewing seismograph by R. T. C. 
and S. E. 
Students’ Observatory, A.O. L. 
Longer than usual, F. L. 
Nearly vertical. 
F.L 
Southwest-northeast. No clock 
stopt, 8. D. T. 
Oscillatory motion. 
Caused some clocks to stop; 
not all. 
Moderate, N. E. 
A. M. H. 
Vertical, K. B. 
Harbor Lt. St’n, Alameda Pier. 
Ewing seismograph by R. T. C. 
and S. E. 
Faculty Club, 8. A. 
Bi LON: 
A. G. McA. 
Very light, A. G. McA. 
A. G. McA. 
412 REPORT OF THE CALIFORNIA EARTHQUAKE COMMISSION. 
Record of after-shocks — Continued. 
Day. Berens of | Duration. Intensity. Locality, 
lee hast, HI secs 
Apr. 18,a.m.| 9 4022.2. 1 iain Scott’s Valley..... 
9 48. ee ee ee eee Oise. Neace ee 
9.48.4 Sa oe eee San Francisco.... 
9 51) Soak alls csc ae ae Berkeléyecaencce- 
9 54 30. Le ere III San Francisco .... 
10:62. eee ee eee Lakeports..0-..3- 
10 Or eee eee eee Oaklandes 2. 
lO net ee eae lees Upper Lake...... 
10 04 39.. (KES ese IV Winah = ese se eee 
10:05. Seale IV Cloverdale... ....- 
10: O53 oe eee eee San Francisco.... 
10s 05¢4'7e- ee) een nee oe Point Reyes...... 
10 05° 50 sl ao eee Farallones........ 
100602925 e) eee ee eee Berkeleycs.jce< ace 
OO A aesa8- pene Bf San Francisco.... 
10°22: Jess 4 eee ee ee Scott’s Valley .... 
10 (30 2. osc 15.2c.cuuy ower Southampton Shoal 
lO jG cee i Beg II San Francisco .... 
10: 50¢ 32 5..2 6) eee ees GOs sexes ose 
LONSORS0re irc a Os8 2 ee oee 
U1 acc aceees | dey aes Scott’s Valley .... 
11 0035 esa eee V S. F. Peninsula... 
14. 06 Seen ee tenes eee San Francisco .... 
Ti OG3 232 yee 5 eo. eee Berkeley .......-- 
11-06. 2754 280 eee 76 (oh ees pete * 
C1):07 230-2) Ge ee Antiochies ee ssse- 
11 O82 eee eee ah Aig! San Francisco .... 
A 3 ee Scott’s Valley ..-.- 
Li ibeeee eee 2x e- 2 Bonita Point ..... 
1622 Se sae 60.3222 See Scott’s Valley .... 
11 36:00; 35 eee Ill Wiciah see ate 
11 139 4. eee eee Ill Cloverdale. j-....2 
11 (40 J scncee Ul oe ee Upper Lake...... 
1 427 Ree al ee tad San Francisco .... 
[1 S3e34 ea eee Il Mt. Hamilton..... 
11 53:3 (ee eee ee I ote 
Apr. 18;pm,}\12 03¢207 2.2 eee Oalklandesse-—-—e- 
12.03 2.245. 1) eee San Francisco .... 
12. 03:-43.225 Wl 22 o. 2 oe eee Berkeleyicco5--2.- 
12 05044. PA ee II+ ole eon 
1D O88 52 ice. StS aeaeeen AN eee GO-2e ace 
12404. 53 see Ate Iil San Francisco 
12 DL ces. Sele A a ee felon one ee 
122.13 eee oe ye II GO con eee eet 
1225 eee Nee eee Hurekatessesocre 





Slight and of short duration, 
A. H. B. 


