CAUSE OF EARTHQUAKES——HOBBS 261 
circum-Pacifie or Andes-Japan-Malay circle (41.08 per cent of the quakes). 
These two zones correspond with the two most important lines of relief of the 
terrestial surface. (Fig. 1.) 
4, Coasts visited by Seismic Sea Waves ( Rudolph) 
lines of Mesozoic Era 
- Geosynce 
=- 
¢ 
¢ . 
Fic. 1.—Map by De Montessus to show the earthquake girdles, but reduced to the Mollweide projection 
a 
apy Seismic Areas (de Montessus) 
Mesozoic geosynclines.—Dr. de Montessus further concluded: 
The zones, the seismic regions, coincide exactly with the geosynclines of 
the Secondary epoch. 
The geosynclines—the most mobile bands of the earth’s surface—where 
the sediments have been deposited in the greatest thickness, have been ener- 
