368 REPORT OF THE CALIFORNIA EARTHQUAKE COMMISSION. 
as the direction toward which the greatest horizontal displacement took place due to 
vibration. Other observations on the directions of the vibratory movement may be 
found in Professor Omori’s paper." 




Dipsea 

Willow Camp 
- 
S 
Fic. 65. — Directions of earthquake motion. Fig. 66.— Statistical representation of the directions of fall of monu- 
ments in the cemeteries south of San Francisco. Each x represents 
a monument which fell in the direction indicated by the radius 
on which the x is placed. After Omori. 

‘Preliminary note on the cause of the San Francisco earthquake of April 18, 1906. Bull. Imp 
Bai, Ci aVol lo Nowks 
