Phil. Trans., A, vol. 218, Plate 3. 
Fig. 4. Pulkovo seismogram, August 1, 1913. 
Deduced epicentre—A =- 7100 km., <#> = 47” N., X = 155” E. 
Note. —Pulkovo recorded each component on two scales of magnification. Time breaks at one minute intervals. 
