SEISMIC AND VOLCANIC CENTERS OF THE PHILIPPINE ARCHIPELAGO

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Page 13 - ... action, or at least give vent to hot springs. Mt. Malinao is doubtless an extinct volcano; its crater is broken or opened to the north probably by the erosion of the waters which found their outlet in that direction. At the foot of the north side of this volcano the most remarkable solfataras and hot springs in Luzon are to be found; some of the springs here deposit siliceous sinter in various fantastic forms, and pyritous deposits of recent date are also found.
Page 24 - Manila.—Manila is most advantageously situated for experiencing almost all the shocks radiating from the different centers of Luzon; it is no more than thirty-five miles north of the active volcano Taal and a little more from the extinct ones, Maquiling, Banajao, and Arayat.
Page 8 - The Apo volcano (7° 03' north latitude and longitude 125° 17' east of Greenwich), the summit of which rises 10,311 feet above the sea level, gives evidence of its activity by numerous solfataras, or jets of sulphurous vapors, which escape with a sharp, hissing sound and hover, cloudlike, over the summit of the mountain. The principal solfataras break out from a nearly southern crevasse which starts from the top, or the ancient crater, down the side of the mountain.
Page 17 - Eruption of blnck smoke and ashes. Eruption of gases which were so sulphurous that the characteristic odor was perceptible as far as the town of Talisay. A large herd of cattle died on the Island of Volcan, on whose western shore the abundant vegetation was almost completely burned.
Page 8 - Agusan river valley, about longitude 125° 50' east of Greenwich and 7° 40' north latitude, not far from the source of the river. This focus is possessed of great seismic activity, as is evidenced by the long series of earthquakes observed and carefully recorded by the Jesuit missionaries of that region since the year 1890. In June, 1891, a violent earthquake was the beginning of a long and fearful seismic period. This earthquake produced the most awful havoc to the houses and ground; fortunately,...
Page 17 - June the volcano was observed to be more active than usual, and sometimes at night the crater wns covered with a glare. On the 17th, 18th, 19th, 20th, and 21st of July subterranean noises were heard, and many witnesses at Talisay, some six miles distant, report that from time to time a small ball of fire (apparently about 2J feet in diameter) appeared above the crater. This ball, after reaching a considerable height, burst Into small fragments, some of which fell back into the crater and the remainder...
Page 7 - ... AND DIVISIONS OF PHILIPPINE VOLCANOES. There are 23 volcanoes in the Philippine Archipelago, 11 of these being more or less active. They are as follows: In the island of Luzon, Mayon, Taal, Bacon, and Bulusam; in the Babuyanes Islands, Babuyan, Camiguin, and Diclica; in the island of Negros, Canlaon or Malaspina; in the island of Camiguin, just off the north coast of Mindanao, Camiguin; and in the island of Mindanao, Apo and Macturin. The others are considered as extinct and are as follows: Cana,...
Page 24 - I II III IV V VI VII j VIII IX X XI XII...
Page 17 - On the day mentioned an eruption began which lasted until the 15th and covered the whole island of •Pulo with a shallow layer of volcanic ash ; there was however no earthquake. Finally from the 8th of June 1880 the volcano was observed to be more active than usual, and some nights the crater was covered with a glare...
Page 16 - Ttml volcano. Many fissures were opened in the earth around the volcano. Damages to buildings were very great in the provinces of Manila. Cavite, Bulacan, La Laguna.

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