Notes
Earth Shaker, a novel by Robert E. Vardeman writing as Nick Carter.

Volume 160 of the Nick Carter: Killmaster series.

Publisher’s Blurb – Lower Cover
One by one the major countries of the world are rocked with crippling earthquakes. The earth-shattering explosions are the workings of a madman who calls himself "Earth Shaker". And the United States is next-unless Nick Carter, Killmaster, can stop him first.

And the race is on as Nick soars from the Mediterranean to Paris, and on to Mexico City to thwart the efforts of the mysterious "Earth Shaker". But his only clue is the man with the sloping forehead and the crossed eyes . . .