











416 REPORT OF THE CALIFORNIA EARTHQUAKE COMMISSION. 
Record of after-shocks — Continued. 
Day. Pee of Duration. |Intensity. Locality. Remarks. 
hie ws secs. 
Apr. 22;8.m5Bc00 ruse es. 1.5... .)) eee Mile Rocks....... Slight. 
658 See es Seen | Rerteree Scott’s Valley .... | Two shocks barely separated, 
last continuing fully 5s.; each 
a good shake, not severe 
but steady, oscillating, F. L. 
(ERS eer Dore eee Mile Rocks....... Moderate. 
7:03:00 22° 2 2 ae San Francisco.... | Light, A. G. McA. 
T OS 25 eee ees Scott’s Valley .... | A mere jolt, F. L. 
11 30205.) seu or eee Saratoga ....:-..- Described as underground ex- 
plosion, about 115 30™ a. m. 
Apr. 22; p.™.| Sinus. deace nal eae he ae ee Napa Ase =. ove ae W...HoM; 
SN re Ae 3. .e eel oeeee Mile ROCKSa 2-52 Moderate. 
oe Wile et eae ee [Rae oe? Bonita Point ..... Nearly vertical. Direction N W.; 
no tremor, just ajar, 1 max., 
strongest at beginning. No 
sound, may have been blast- 
ing. 
3.18 20.2271) 602... Ill Berkeley .....-.... Tremulous motion for 5 m. 
after shock. Long duration 
of trem. motion also observed 
by Mr. Huber, who was in 
laboratory at time, weighing 
chemicals, 8. A 
3°18 22. Dems III Oakland ss -seqrece C.B. 
3 19 GRR eee) hea ae Yerba Buena..... Light. 
319° 30 22 Ass zee | | testee San Francisco Moderate rocking, about four 
waves, A.G. McA 
S'35 Heese ee eee seen ALINE So. 2. eee 
9-08.08 ee. > pra taee Wear pe Mile Rocks....... Slight. 
LO: 4.0. Sos ie iyo, eee mene AMAGS Se yee 
11] 20.2 .c S25 ana ee Scott’s Valley .... | Tremor, F. L. 
Apr. 23,a.m.| 12 05 00..- ES Nese ric San Francisco .... | A. G. McA. 
12348) eee ere SCE Trinidad Head.... | East-west tremor 5 s. before, 
short and heavy; clock stopt 
12h 48™ a. m., facing east; 
sound like thunder, preceded 
and continued during shock; 
same throughout, no change. 
12 bb 2essee 6... ore Cape Mendocino.. | Vertical. Southwest-northeast. 
Direction NE. increasing in- 
tensity. Clock stopt. Pend. 
22”, facing SW. No sound. 
110. oc stee ay es eene eeee Grant’s Pass, Ore. 
130.3220 14.233 V-VI | Eureka........... resect Stopt clocks, 
A. H. B. 
POLL tts ces 10 22356 aoe Ferndale... c.c..5 Severe shock, J. A. S. 
Daas ee ee eae Scott’s Valley Light and short, but decided, 
lice Fe 
ee ee es Il Crescent City..... West-east. 
L1G wae 2 ee Ree rs Peer teen & South-north. Woke up every- 
body, no damage. 
tLe Se eee Cape Mendocino.. 
Ds o:a ia apse Rs eat eae re ene Scott’s Valley .... | “ out enough to waken me,”’ 
L. 
OO aoe ee pI Se Bureka...cs- eo. ne South-north. Slight. 
GO w esa rampart WE Se. Merndale ot siswe ne Severe shock, J. A. 8. 
Sian en a eal Nalitigg 25 .saene 
S$ LOCO. S25 ee Ill OnklanGgssae From east, C. B. 
Ds Ln sie ofr 4 Neen Mile Rocks ....... Moderate. 
Apr. 23, p.m. 12 45, 2) ew ae ee ee Scott’s Valley Barely perceptible, F. L. 
12 48. ewe tee eee eee 6 (oe ek Pasa Very light, F. L. 
12 50. oes i en ees die wo aee More decided, F. L. 
4 OD denideee BO. oe. wae dotec nee Decided trembling lasting per- 
haps 30 s., F. L. 
SjO1e sae ame Listen igen San Francisco.... | Sharp, downward jolt,A.G.McA, 
5330. eee Salihas:: vac .tasunis 


