Philippine Island - Jolo Island - NARA - 68155990

The Jolo Group of Volcanoes, more commonly referred to as the Jolo Group, are an active group of volcanoes in the island of Jolo in Southern Philippines. The Global Volcanism Program lists Jolo as one of the active volcanoes in the Philippines while the Philippine Institute of Volcanology and Seismology (PHIVOLCS) collectively list the group as Bud Dajo, one of the

cinder cone A cinder cone (or scoria cone) is a steep conical hill of loose pyroclastic fragments, such as volcanic clinkers, volcanic ash, or scoria that has been built around a volcanic vent. The pyroclastic fragments are formed by explosive eruptions o ...

s on the island.

Location

Jolo is a volcanic island located southwest of the southern tip of the Zamboanga Peninsula of Mindanao Island. The island is part of the Sulu Archipelago, in the province of

Sulu Sulu (), officially the Province of Sulu (Tausug language, Tausūg: ''Wilāya sin Lupa' Sūg''; tl, Lalawigan ng Sulu), is a Provinces of the Philippines, province of the Philippines in the Sulu Archipelago and part of the Bangsamoro, Bangsamor ...

, located within the Autonomous Region in Muslim Mindanao, one of the

Regions of the Philippines In the Philippines, regions ( fil, rehiyon; ISO 3166-2:PH) are administrative divisions that primarily serve to coordinate planning and organize national government services across multiple local government units (LGUs). Most national governm ...

Physical features

The figure-eight shaped island is about at its longest, about at its widest and about at the narrowest section. The volcanic island is dotted with

s, tuff cones,

pyroclastic cones Volcanic cones are among the simplest volcanic landforms. They are built by ejecta from a volcanic vent, piling up around the vent in the shape of a cone with a central crater. Volcanic cones are of different types, depending upon the nature and s ...

maar A maar is a broad, low-relief volcanic crater caused by a phreatomagmatic eruption (an explosion which occurs when groundwater comes into contact with hot lava or magma). A maar characteristically fills with water to form a relatively shallow ...

s and crater lakes. The highest point in the island is Mount Tumatangas with an elevation of

asl American Sign Language (ASL) is a natural language that serves as the predominant sign language of Deaf communities in the United States of America and most of Anglophone Canada. ASL is a complete and organized visual language that is express ...

. Bud Dajo has an elevation of asl. Guimba, Matanding, and Sungal, are some other volcanic cones near Bud Dajo. Four crater lakes are located on the island:

Lake Seit Lake Seit, also spelled Siit or Siet, is a volcanic lake on the island of Jolo Jolo ( tsg, Sūg) is a volcanic island in the southwest Philippines and the primary island of the province of Sulu, on which the capital of the same name is situated ...

, Lake Panamao and Lake Timpuak and Sani Crater Lake. Solfataric activity is found at Seit Lake.

Volcanic activity

On January 4, 1641, a volcanic eruption covered much of Mindanao in darkness and sent showers of ash as far as Cebu and Panay. It was reported at the time as being from a small island "opposite the main river of Jolo" and the only possible source of eruption in Jolo is Mount Dakula near Lake Panamao.Some Philippine Volcanoes
From recent studies, the eruption was finally attributed to Mount Parker in South Cotabato. A tsunami occurred in 1897, believed to have been caused by a local submarine eruption on September 21, 1897. It is possible this eruption was centered at Lake Seit, a volcanic

with still active solfatara. Volcanoes in the Jolo Group are young and considered active on the probable eruptions above.

Geology

Rock types are predominantly basalt and andesite. Jolo Group is part of the

Sulu Volcanic Arc Sulu (), officially the Province of Sulu ( Tausūg: ''Wilāya sin Lupa' Sūg''; tl, Lalawigan ng Sulu), is a province of the Philippines in the Sulu Archipelago and part of the Bangsamoro Autonomous Region in Muslim Mindanao (BARMM). Its cap ...

, one of the two northeastern arms of the

Sunda Plate The Sunda Plate is a minor tectonic plate straddling the Equator in the Eastern Hemisphere on which the majority of Southeast Asia is located. The Sunda Plate was formerly considered a part of the Eurasian Plate, but the GPS measurements have ...

which is in collision with the

Philippine Mobile Belt In the geology of the Philippines, the Philippine Mobile Belt is a complex portion of the tectonic boundary between the Eurasian Plate and the Philippine Sea Plate, comprising most of the country of the Philippines. It includes two subduction z ...

. It is an area of frequent earthquakes and volcanic activity. Like most volcanos in the former Sultanate of Sulu, the group is little studied scientifically. All volcanos in the Philippines are part of the Pacific ring of fire.

Political

Because of aggravated political unrest, kidnappings of foreigners in 2009, and fighting between political independence and government forces, visitors are strongly recommended to keep away from the Jolo islands.

References

External links

Philippine Institute of Volcanology and Seismology (Phivolcs) homepage
{{DEFAULTSORT:Jolo Group Stratovolcanoes of the Philippines Subduction volcanoes Volcanic groups Volcanoes of Mindanao Mountains of the Philippines Active volcanoes of the Philippines Landforms of Sulu