Philippine Island - Jolo Island - NARA - 68155990

The Jolo Group of Volcanoes, more commonly referred to as the Jolo Group, are an active

group A group is a number of persons or things that are located, gathered, or classed together. Groups of people * Cultural group, a group whose members share the same cultural identity * Ethnic group, a group whose members share the same ethnic ide ...

volcano A volcano is a rupture in the crust of a planetary-mass object, such as Earth, that allows hot lava, volcanic ash, and gases to escape from a magma chamber below the surface. On Earth, volcanoes are most often found where tectonic plates are ...

es in the

island An island (or isle) is an isolated piece of habitat that is surrounded by a dramatically different habitat, such as water. Very small islands such as emergent land features on atolls can be called islets, skerries, cays or keys. An island ...

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. It is located in the Sulu Archipelago, between Borneo and Mindanao, and has ...

in Southern

Philippines The Philippines (; fil, Pilipinas, links=no), officially the Republic of the Philippines ( fil, Republika ng Pilipinas, links=no), * bik, Republika kan Filipinas * ceb, Republika sa Pilipinas * cbk, República de Filipinas * hil, Republ ...

. The

Global Volcanism Program The Smithsonian Institution's Global Volcanism Program (GVP) documents Earth's volcanoes and their eruptive history over the past 10,000 years. The mission of the GVP is to document, understand, and disseminate information about global volcanic a ...

lists Jolo as one of the active volcanoes in the Philippines while the

Philippine Institute of Volcanology and Seismology The Philippine Institute of Volcanology and Seismology (PHIVOLCS, ; tl, Surian ng Pilipinas sa Bulkanolohiya at Sismolohiya) is a Philippine national institution dedicated to provide information on the activities of volcanoes, earthquakes, and ...

(PHIVOLCS) collectively list the group as

Bud Dajo Bud Dajo ( tsg, Būd Dahu; es, Monte Dajó), is a cinder cone and the second highest point (+600m) in the province of Sulu, Philippines. it is one of the cinder cones that make up the island of Jolo and part of the Jolo Volcanic Group in the ...

, 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 Zamboanga Peninsula ( tl, Tangway ng Zamboanga; cbk, Peninsula de Zamboanga; ceb, Lawis sa Zamboanga) is an administrative region in the Philippines, designated as Region IX. It consists of three provinces (Zamboanga del Norte, Zamboanga Sibu ...

Mindanao Island Mindanao ( ) ( Jawi: مينداناو) is the second-largest island in the Philippines, after Luzon, and seventh-most populous island in the world. Located in the southern region of the archipelago, the island is part of an island group of t ...

. The island is part of the Sulu Archipelago, in the

province A province is almost always an administrative division within a country or sovereign state, state. The term derives from the ancient Roman ''Roman province, provincia'', which was the major territorial and administrative unit of the Roman Empire ...

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 The Autonomous Region in Muslim Mindanao ( tl, Rehiyong Awtonomo ng Muslim Mindanao; ar, الحكم الذاتي الاقليمي لمسلمي مندناو ''Al-ḥukm adh-dhātī al-'iqlīmī li-muslimī Mindanāu''; abbreviated as ARMM) was ...

, 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

tuff cone 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 ...

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 lake Crater Lake (Klamath language, Klamath: ''Giiwas'') is a volcanic crater lake in south-central Oregon in the western United States. It is the main feature of Crater Lake National Park and is famous for its deep blue color and water clarity. The ...

s. 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 ...

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 A fumarole (or fumerole) is a vent in the surface of the Earth or other rocky planet from which hot volcanic gases and vapors are emitted, without any accompanying liquids or solids. Fumaroles are characteristic of the late stages of volcani ...

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 A tsunami ( ; from ja, 津波, lit=harbour wave, ) is a series of waves in a water body caused by the displacement of a large volume of water, generally in an ocean or a large lake. Earthquakes, volcanic eruptions and other underwater explo ...

occurred in 1897, believed to have been caused by a local

submarine eruption Submarine eruptions are those volcano eruptions which take place beneath the surface of water. These occur at constructive margins, subduction zones and within tectonic plates due to hotspots. This eruption style is far more prevalent than subae ...

on September 21, 1897. It is possible this eruption was centered at Lake Seit, a volcanic

with still active

solfatara A fumarole (or fumerole) is a vent in the surface of the Earth or other rocky planet from which hot volcanic gases and vapors are emitted, without any accompanying liquids or solids. Fumaroles are characteristic of the late stages of volcani ...

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

Geology

Rock types are predominantly

basalt Basalt (; ) is an aphanite, aphanitic (fine-grained) extrusive igneous rock formed from the rapid cooling of low-viscosity lava rich in magnesium and iron (mafic lava) exposed at or very near the planetary surface, surface of a terrestrial ...

and

andesite Andesite () is a volcanic rock of intermediate composition. In a general sense, it is the intermediate type between silica-poor basalt and silica-rich rhyolite. It is fine-grained (aphanitic) to porphyritic in texture, and is composed predomi ...

. 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 Sultanate of Sulu (Tausug language, Tausūg: ''Kasultanan sin Sūg'', كاسولتانن سين سوڬ; malay language, Malay: ''Kesultanan Sulu''; fil, Sultanato ng Sulu; Chavacano: ''Sultanato de Sulu/Joló''; ar, سلطنة سولك) ...

, the group is little studied scientifically. All volcanos in the Philippines are part of the

Pacific ring of fire The Ring of Fire (also known as the Pacific Ring of Fire, the Rim of Fire, the Girdle of Fire or the Circum-Pacific belt) is a region around much of the rim of the Pacific Ocean where many Types of volcanic eruptions, volcanic eruptions and ...

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