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Popocatapetl emits smoke, but there is no record of an eruption since 1540. Orizabo has been quiet since 1566. Tuxtla had a violent eruption in 1793, but since then has remained quiescent. Colima is the only one now active. For ten years past it has been emitting ashes and smoke.
East of this mountain lies Orizabo, little below it in height, and San Martin or Tuxtla, 9,700 feet high, on the coast south of Vera Cruz. West of it is Jorullo, 4,000 feet, and Colima, 12,800, near the Pacific coast. The volcanic energy continues southward toward the Isthmus, but decreases north of this volcanic range. These mountains have shown little signs of activity in recent times.
Mount Orizabo, near the City of Mexico, for instance, is a remarkably regular cone, undoubtedly formed in this way, and the same may be said of Mount Mayon, on the Island of Luzon. In many cases the irregularity of the volcano is due to subsequent action of its forces, which may blow the mountain itself to pieces.
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