In some of the straits dividing the islands there are strong currents, rendering navigation of sailing vessels very difficult, notably in the San Bernadino Straits separating the Islands of Luzon and Sámar, the roadstead of Yloilo between Panay and Guimarrás Islands, and the passage between the south points of Cebú and Negros Islands.
Most of the islets, if not indeed the whole Archipelago, are of volcanic origin. There are many volcanoes, two of them in frequent intermittent activity, viz. the Mayon, in the extreme east of Luzon Island, and the Taal Volcano, in the centre of Bombon Lake, 34 miles due south of Manila. Also in Negros Island the Canlaúan Volcano—N. lat. 10° 24′—is occasionally in visible eruption. In 1886 a portion of its crater subsided, accompanied by a tremendous noise and a slight ejection of lava. In the picturesque Island of Camiguín a volcano mountain suddenly arose from the plain in 1872.
Taal Volcano.
The Mayon Volcano is in the north of the Province of Albay; hence it is popularly known as the Albay Volcano. Around its base there are several towns and villages, the chief being Albay, the capital of the province; Cagsaua (called Darága) and Camáling on the one side, and Malinao, Tobaco, etc., on the side facing the east coast. The earliest eruption recorded is that of 1616, mentioned by Spilbergen. In 1769 there was a serious eruption, which destroyed the towns of Cagsaua and Malinao, besides several villages, and devastated property within a radius of 20 miles. Lava and ashes were thrown out incessantly during two months, and cataracts of water were formed. In 1811 loud subterranean noises were heard proceeding from the volcano, which caused the inhabitants around to fear an early renewal of its activity, but their misfortune was postponed. On February 1, 1814,[2] it burst with terrible violence. Cagsaua, Badiao, and three other towns were totally demolished. Stones and ashes were ejected in all directions. The inhabitants fled to caves to shelter themselves. So sudden was the occurrence, that many natives were overtaken by the volcanic projectiles and a few by lava streams. In Cagsaua nearly all property was lost. Father Aragoneses estimates that 2,200 persons were killed, besides many being wounded.
Mavon Volcano.
Another eruption, remarkable for its duration, took place in 1881–82, and again in the spring of 1887; but only a small quantity of ashes was thrown out, and did very little or no damage to the property in the surrounding towns and villages.
The eruption of July 9, 1888, severely damaged the towns of Libog and Legaspi; plantations were destroyed in the villages of Bigaá and Bonco; several houses were fired, others had the roofs crushed in; a great many domestic animals were killed; fifteen natives lost their lives, and the loss of live-stock (buffaloes and oxen) was estimated at 500. The ejection of lava and ashes and stones from the crater continued for one night, which was illuminated by a column of fire.
The last great eruption occurred in May, 1897. Showers of red-hot lava fell like rain in a radius of 20 miles from the crater. In the immediate environs about 400 persons were killed. In the village of Bacacay houses were entirely buried beneath the lava, ashes, and sand. The road to the port of Legaspi was covered out of sight. In the important town of Tobaco there was total darkness and the earth opened. Hemp plantations and a large number of cattle were destroyed. In Libog over 100 inhabitants perished in the ruins. The hamlets of San Roque, Misericordia, and Santo Niño, with over 150 inhabitants, were completely covered with burning débris. At night-time the sight of the fire column, heaving up thousands of tons of stones, accompanied by noises like the booming of cannon afar off, was indescribably grand, but it was the greatest public calamity which had befallen the province for some years past.