Philippines Mayon Volcano Eruption ~ 1939 Castle Films Newsreel See No. 6
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Originally a public domain film from the Library of Congress Prelinger Archives, slightly cropped to remove uneven edges, with the aspect ratio corrected, and one-pass brightness-contrast-color correction & mild video noise reduction applied.
The soundtrack was also processed with volume normalization, noise reduction, clipping reduction, and/or equalization (the resulting sound, though not perfect, is far less noisy than the original).
Wikipedia license: creativecommons.org/licenses/by-sa/3.0/
Mayon (Central Bikol: Bulkan Mayon; Tagalog: Bulkang Mayon, IPA: [mɐjɔn]), also known as Mount Mayon and Mayon Volcano (Spanish: Monte Mayón, Volcán Mayón), is an active stratovolcano in the province of Albay in Bicol Region, on the island of Luzon in the Philippines. A popular tourist spot, it is renowned for its "perfect cone" because of its symmetric conical shape, and is regarded as very sacred in Philippine mythology.
The volcano with its surrounding landscape was declared a national park on July 20, 1938, the first in the nation. It was reclassified as a natural park and renamed the Mayon Volcano Natural Park in 2000. It is the centerpiece of the Albay Biosphere Reserve, declared by UNESCO in 2016, and is currently being nominated as a World Heritage Site.
Mayon is the most active volcano in the Philippines, and its activity is regularly monitored by the Philippine Institute of Volcanology and Seismology (PHIVOLCS) from their provincial headquarters on Ligñon Hill, about 12 kilometers (7.5 mi) from the summit...
Mayon is a classic stratovolcano with a small central summit crater. The cone is considered the world's most perfectly formed volcano for its symmetry.
The concave profile, a hyperbolic sine curve of the volcano is due to the balance between erosion and eruption, defined by the angle of repose of ash. The steepest upper slopes of the volcano reach an average slope gradient of 75%, while the lower foot slope is only an average of 3%. The volcanic crater is about 250 m in diameter. At least 85 lava flows have been identified, and consist mainly of 'A'ā augite-hypersthene-andesite, generally fed from the crater. Pyroclastic flows, characterized as a St. Vincent nuee' ardente, leave behind block and ash deposits, and breadcrust bombs in an ash and lapilli matrix. The farthest flow reached 8.5 km along Fidel Surtida, Santo Domingo. Mayon lahars were formed by rainstorms during eruptions, or by torrential rain afterwards. Averaging 230 m in height and 710 m in diameter, 7 cinder cones are found on the southern and southwestern lower slopes. Composed of olivine-augite basalt, these cones have an angle of repose of 34%, with Ligñon Hill as an example.
Like other volcanoes around the Pacific Ocean, Mayon is a part of the Pacific Ring of Fire. It is on the southeast side of Luzon. The Bicol Arc is one of 7 oceanic trench subduction zones defining the Philippine Mobile Belt. Volcanism in the Bicol Arc is related to the westward subduction of the Philippine Plate along the Philippine Trench. The 12 active and inactive volcanoes within the arc include the Mayon Volcano, Mount Isarog, Mount Iriga, Malinao Volcano, and Mount Masaraga. In general, these are calc-alkali basalts, basaltic andesites, and andesites...
Mayon is the most active volcano in the Philippines, erupting over 47 times in the past 500 years. Historical observations accounted its first eruption in 1616. The first eruption for which an extended account exists was the six-day event of July 20, 1766...
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