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Show THEORY AS TO EARTHQUAKES. Possibility That One Shock Has Power Pow-er to Set Off Another. The possibility that the shocks of an earthquake, transmitted through the earth's mass, may "set off" another anoth-er quake thousands of miles distant has been suggested by an Italian student stu-dent of the subject, Signor Emilio Od-done. Od-done. Of course, this would be the case only, where the crust of the earth was in such an unstable condition that a good jarring would cause slipping or breakage. Signor Oddone has recently recent-ly called attention to the fact that just half an hour after the great Valparaiso Val-paraiso earthquake another quake was recorded, the center of which was in the north Pacific, about 7,000 miles distant. The time required for an earthquake wave to traverse the solid substance of the earth from one of these points to the other is just the period that separated the two disturbances. disturb-ances. It may well be, therefore, that the big Valparaiso quake pulled the trigger that "exploded," so to speak, its smaller successor in the northern hemisphere. |