Map Showing the Areas of the Earth Chiefly Affected by Seismic Disturbances. It will be noted that within certain of these areas are the highest mountains of the world—which were uplifted during the most recent of the world's mountain making periods. Certain other areas are also marked by crustal warping and such lack of equilibrium as to produce more or less frequent earthquakes.

1. Alaska-British Columbia belt. 2. California-Ecuador belt. 3. Peru-Patagonia belt. 4. West Indian area. 5. Bermuda area. 6 Iceland area. 7. North African-Portugal-Ireland area. 8. Alpine-Himalayan area. 9. South India-Madagascar region. 10. Malaysian area. 12. Japan-Phillipine area.