geo.wikisort.org - Mountains

Mount Isarog is an active[6] stratovolcano located in the province of Camarines Sur, Philippines, on the island of Luzon. The mountain has active fumaroles and hot springs.[7][8] It has an elevation of 2,011 m (6,598 ft) above mean sea level.[9]

Mount Isarog
Mt. Isarog viewed from Pili, Camarines Sur
Highest point
Elevation	2,011.6 m (6,600 ft)[1][2]
Prominence	1,951 m (6,401 ft)[1]
Parent peak	Mayon
Listing	Active volcano Ultra
Coordinates	13°39′33″N 123°22′24″E[1][3]
Geography
Mount Isarog Show map of Luzon Mount Isarog Show map of Philippines
Country	Philippines
Region	Bicol Region
Province	Camarines Sur
City/municipality	Calabanga Goa Naga City Ocampo Pili Tigaon
Geology
Mountain type	Stratovolcano
Volcanic arc/belt	Bicol Volcanic Chain
Last eruption	2,374 BCE ± 87 years [4] 3,500 BCE ± 125 years (5,500 ya ± 125 years)[5]
Climbing
Easiest route	Concosep, Tigaon, Camarines Sur Route

The broad isthmus between Lagonoy Gulf and San Miguel Bay is occupied by the isolated Mount Isarog volcano.

The volcano has a 2,500 m (8202 ft) crater that is breached to the east along a narrow valley drained by the Cabongaan water stream. A major debris avalanche deposit extends northwest to the coast and into San Miguel Bay.[10]

The peak of the mountain marks the point where the borders of six municipalities and one city meet (listed in clockwise direction, starting north): Goa, Tigaon, Ocampo, Pili, Naga City, Tinambac and Calabanga.

Mount Isarog was where local troops of the Philippine Army and Constabulary units and Bicolano guerrillas hid during the Japanese Occupation. In the 1970s, with the leadership of Romulo Jallores and his brother, they established the New People's Army in the Bicol region at the foot of this mountain.[9]

History

Indigenous history

Mount Isarog has been the ancestral territory of the indigenous Isarog Agta people for thousands of years prior to the arrival of the Spanish. They are one of the first inhabitants in the entire Philippines and are of Negrito origin. They are a group of Aeta people with a distinct language and heritage unique from others.

Legal history

It was made a public land through the Proclamation No. 157 on March 28, 2015. Towns around it is classified as timberland forest with an area of 13,433 hectares (33,190 acres).

On August 17, 1935, General Frank Murphy established the Mt. Isarog Forest Reserve which reduced the size of the area to 10,112. But it was revoked by President Manuel L. Quezon when he signed Proclamation No. 293 titled "Establishment of Mt. Isarog as a National Park."[11]

On June 1, 1992, with the passage of Republic Act 7586 known as the National Integrated Protected Areas System or NIPAS, Mt. Isarog was National Integrated Protected Area Programme.^{[incomprehensible]} On June 20, 2002, by virtue of Proclamation No. 214, Mt. Isarog became a protected area under the natural park.[12]

Eruption history

Pyroclastic flows originating from lava dome collapses have occurred during the Holocene, one of which has a calibrated radiocarbon date of about 3,500 BCE. In 2020, a group of geologists from Partido State University discovered that Isarog also erupted around 4,300 years ago after a charcoal overlain by thick block-and-ash flow deposits was found.[13][14] The charcoal was sent to the United States for radiocarbon dating. This new information about the eruptive history of Isarog was presented at the 2020 Virtual GeoCon, a convention of geologists organized by the Geological Society of the Philippines. Currently, Isarog vent displays gas seepages, warm springs, and steaming vents.[15]

Seismic history

On 8 November 1915, frequent earthquakes were felt on and around Isarog volcano, with some occasional noises. Landslides occurred on the slopes of Isarog volcano. The seismic swarm repeated itself 2 or 3 times at long intervals until 10 January 1916. The volcano was thickly wooded, even inside of the crater, and nobody observed any fumaroles.[8][7]

Ethnic groups

Isarog Agta Tribe

The Isarog Agta people live within the circumference of Mount Isarog, though only 5 of them still know their indigenous language. They are one of the original Negrito settlers in the entire Philippines. They belong to the Aeta people classification, but have distinct language and belief systems unique to their own culture and heritage.

In 2010, UNESCO released its 3rd world volume of Endangered Languages in the World, where 3 critically endangered languages were in the Philippines. One of these languages in the Isarog Agta language which has an estimated speaker of 5 people in the year 2000. The language was classified as Critically Endangered, meaning the youngest speakers are grandparents and older, and they speak the language partially and infrequently and hardly pass the language to their children and grandchildren anymore. If the remaining 150 people do not pass their native language to the next generation of Isarog Agta people, their indigenous language will be extinct within a period of 1 to 2 decades.

Biodiversity

Mt. Isarog has a rich diversity. It displays four major types of natural habitat or vegetation: from the warm grassland and lowland forest to the wet and cool climate of montane forest.

Types	Altitude (meters asl.)
Lowland Forest	500-900
Grassland	700-1,200
Montane Forest	1,000-1,400
Mossy Forest	1,500-to the summit

The lowland forest is noted for its tall canopy. The uppermost layer towers between 30–40 meters and sometimes even reach 60 meters. Many of these trees belong to the dipterocarp family. The second canopy layer (between 23–30 meters) has the sustain bamboos (Bambusa), arborescent palms (Calamus), climbing bamboo (Schizostacyum), climbing pandans (Freycinetia) and vascular epiphytes such as orchids and ferns.

The grassland (parang) is dominated by cogon (Imperata cylindrica) and talahib (Saccharum ovatum) grasses. The topography and soil condition of the area limits the growth of trees, giving rise to the grassland.

The montane forest has two-oken because layered canopy trees ranging from 12–25 meters with noticeable canopy gaps due to the absence of large trees.

The mossy forest has a canopy with a small height of 2 to 6 meters only. The canopy is broken because of the high winds and steep terrain. It is inhabited by bamboo, pandan, orchids, ferns, pitcher plants and other epiphytes. Trees at this level are covered with moss.

Endemic

Isarog Shrew rat (Rhynchomys isarogensis) was first discovered in 1988 in Mount Isarog. Although it has no direct economic value, its presence in Mount Isarog is a barometer of wealth and management of its natural resources. It is now listed as endangered in the Red Data Book of the International Union for Conservation of Nature.[16]

Mount Isarog is included as a protected area, home to endemic rodents (Archboldomys luzonensis, Chrotomys gonzalesi and Rhynchomys isarogensis), other endemic mammals, and 15 bird species endemic to Luzon.

Isarog Cloud Frog was first described by scientists in 1997. In total, scientists have identified one and possibly three new frog species, 8 species of snakes, and 19 species of lizards.

Mount Isarog also has the rare Mount Isarog Forest Skink (Sphenomorphus knollmanae) that is endemic.[16]

Gallery

• 
  View from Pili, Camarines Sur
• 
  View from San Jose, Camarines Sur
• 
  View from Naga, Camarines Sur
• 
  View from Minalabac, Camarines Sur
• 
  View from Baao, Camarines Sur
• 
  View from Tinambac, Camarines Sur
• 
  View from Sagñay, Camarines Sur
• 
  View from Ocampo, Camarines Sur

See also

• List of active volcanoes in the Philippines
• List of potentially active volcanoes in the Philippines
• List of inactive volcanoes in the Philippines
• List of protected areas of the Philippines
• Philippine Institute of Volcanology and Seismology
• Pacific ring of fire

References

External links

• Media related to Mount Isarog at Wikimedia Commons
• Phivolcs' Mount Isarog page
• "Mount Isarog, Philippines" on Peakbagger

На других языках

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[de] Isarog

Der Isarog ist ein 1966 Meter hoher Stratovulkan, circa 280 km südöstlich von Manila. Er liegt auf den Philippinen auf der Insel Luzon in der Provinz Camarines Sur in der Region Bicol etwa 20 km nordöstlich der Stadt Naga. Der Mount-Isarog-Nationalpark wurde 1938 gegründet und umfasst den kompletten Berg auf einer Fläche von 99,71 km².

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- [en] Mount Isarog

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[es] Monte Isarog

Monte Isarog[1] es un estrato volcán potencialmente activo ubicado en la provincia de Camarines Sur, Filipinas,[2] en la isla de Luzón. Tiene una altitud de 2.000 metros sobre el nivel del mar.[3]

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[fr] Mont Isarog

Le mont Isarog est un volcan des Philippines situé sur l'île de Luçon et culminant à 1 966 mètres d'altitude[1].

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[it] Monte Isarog

Il Monte Isarog (1.966 m s.l.m.) è uno stratovulcano quiescente situato nelle Filippine, nella regione di Bicol, all'interno della Provincia di Camarines Sur, che si eleva a 1 966 metri ed è parte della catena vulcanica di Bicol[1] L'ultima eruzione nota risale all'anno 1641.

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