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Rl
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WORLDWIDE EARTHQUAKE BELTS
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NORTH
AMERICA
[) PLATE BOUNDARIES
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B
PLATE MOVEMENT
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RECENT QUAKE EPICENTERS
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AUSTRALIA
The map reveals major and minor "plates' ' lnto which the
shell of the planet is at present broken. Most quakes occur
along plata edges as quake epicenters (red dots) clearly show.
Arrows indicate plata dlrections caused by convectlon cur- ·•
rents in the earth's mantle.
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22
The
PLAIN TRUTH September 1976