REPORT OF THE CALIFORNIA EARTHQUAKE COMMISSION. 
Record of after-shocks — Continued. 


Day. 
May 17,a.m. 
May 17,p.m. 
May 18,a.m. 
May 18,p.m. | 
May 19,a.m. 


Beginning of 







Backs Duration. |Intensity. Locality, Remarks, 
ja Geol ah secs 
During night | ....... Jmperialy/- 22. Two slight shocks. 
1221842. eke ee ee VI S. F. Peninsula... | One of the severest since the 
first shock, woke all sleepers, 
swayed houses, set dogs 
barking. 
12-730. Se sage d ee Be eee Berkeley ......... GK. G. 
12. Boece eee ee eee T208 Gatos. 3 soe MARL sh, 
11 05.4620) <3 ee eee San Francisco .... | Light, A. G. McA. 
3 40. een Ferndale s...0¢..- s Two more before6a.m.,J.A.8. 
8 15.25.2924 WSR cee eee Mile Rocks....... | Vertical. Strongest in middle. 
Sie ee le Oakland! 6 a0. 5. Alameda, Pier. 
Bile a eee betes V Los Gatos. i235 Short, but with considerable 
vertical motion, I. H.S. 
8720 Fee. eae CeCe ee Balinad o.oo 
8°20 Fecesee 2 es. bee Bonita Point’... ... Nearly vertical. Direction N., 
no tremor, just ajar, 1 max., 
strongest at beginning. No 
sound, may have _ been 
blasting. 
St2Q0iraeeee 22 ud ee PointsPinosseseee Horizontal. Two max. alike, 
sound like waterin pipe with 
air in it. 
$3 2023.5-05 ne ee eee Oakland. 5e-Geee Chabot Observatory. 
Si2li ee PAVE es 2 VI 5. F. Peninsula... | About the heaviest since first 
shock, causing people to 
rush out-of-doors. 
8.21. Aeeeh Gy. once eheene NSD ELL, Cotes heen oe H.M. 
BS Bl peel. Soceads Tee Gonzales ......... 7 
Susi GAs he ooh “ebcc cen cee Campbell......... Violent. 
8 21 17. Lae TV—V" | Onikiand geen Chandelier swung with period 
of 1.25 s. Shock NW.-SE. 
at Vernon St., R. T. C. 
8 21 22. 1B scce¥ IV Mt. Hamilton..... Vertical slightly, 2max.5s.and 
10 s. after beginning, mean 
of two observers, W. W. C. 
8 21 34.. Sal eee one Berkeley ......... . East-west, A. O. L. 
8 21 40.. Qc iil Holingsssce ose 8. A. 
S22 ed Rakes ah Sees Yerba Buena..... Light. 
ey eee yes et) eee | Le eae Berkeley 2. 2m Faculty Club, G. K. G. 
8 DEBS SAIM. Cee eee San Francisco .... | Moderate rolling motion, A. G. 
CONeee Renee McA. 
S 2h Gas eee tooth ee ee eke Cnidale seve, Very slight. No time given. 
of Ol aea ae oe parte, Mat es Si Southampton Shoal | Southeast-northwest. Rum- 
bling before shake and con- 
tinuing 2 s. after. 
«siti MARR OMI ES Oe oo ee ea Livermore........ No time given. 
ee a Smee en han Oe San Luis Obispo.. | No time given. 
12 22 3 2gp ee Berkeley. v.tse: GEG 
1 45. c-q99e ee ee GO.) Soe as Lo ee Ee 6 
Ey crepe ee Los Gatos........ ae Jebase 
5 23%-c tee a) Seat ee wu San Francisco .... | Light, A. G. McA. 
i 56) seed Wee ae el Ls Siktos ete TPES: 
8.30... oe Diner eal eee Cape Mendocino.. | Southwest. Vertical. Direction 
8S. Very light. 
8 53 37. Bagece TILT Wiikialt oye eeee No max. No sound. Watch 
compared immediately and 
clock correction determined 
within an hour, 8. D. T. 
8:56 3 «mee y RN Ferndale, 353.5 -. J.A.S. 
8 555 faa e le eek. Bee Fort Bragg....... 
D 30 i. 5 ae. eae ee ee Blocksburg. ..... 
10 53s. 20-2 oe eee Los Gatos........ LEAS: 
Between 1223) 2, sa eee CG aha ecw Slight. 
2 30. . Se Ae oo es Campbell......... 
2-30 hee eee eee los Gatos. oars East-west. Vertical, I. H. 8, 

