Full glossary

Jabal el-Marha volcano is an isolated ca. 250 m high tuff cone 11 km south of the capital Sana'a in Yemen. Little is known about this small volcano.

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Jabal Haylan volcano is a 75 km long chain of volcanic vents, cinder cones and lava flows, located about 70 km east of Yemen's capital Sana'a.
The latest eruption from Jabal Haylan must have occurred less than about 3000 years ago.

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Jabal Yar volcano is a small volcanic field, the southernmost of Saudi Arabia, located along the Red Sea coast close to the border with Yemen.
The field contains 3 groups of volcanoes, Qummatain, Djar'atain-Harra and 'Ukwatain. Hot springs occur south of Djar'atain and between Djar'atain and 'Ukwatain.
The only documented historic eruption from Jabal Yar took place around 1810.

Jailolo stratovolcano is in the center of a volcanic complex forming a peninsula west of Jailolo Bay on the western coast of Halmahera Island. Jailolo stratovolcano has not erupted in historic times, but there are young lava flows on the eastern flank.

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Jaraguay volcano is a volcanic field located between Jaraguay and Arroyo San José on the western side of Baja California, Mexico. It contains cinder cones and associated basaltic and basaltic-andesite lava flows, some of which are probably less than about 5000 years old.

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Jebel al-Tair ("bird mountain") volcano is the northernmost active volcano rising above sea level on the rift axis of the south-central part of the Red Sea.
Its western spelling varies from Jebel at Tair to Jebel al Tair, Djebel Teyr, Jabal al Tayr,, Jibbel Tir and other variants.
Jebel al Tair's activity is mainly effusive, but explosive eruptions or explosive phases at the beginning of effusive eruptions occur as well and have produced ash and pumice layers. The first historically recorded eruptions were explosive eruptions (which are easier to detect) in the 18th century. Jebel al Tair's last eruption was in 2007-2008 and killed 8 soldiers and destroyed a military base on the island.

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Jebel Zubair volcano is a shield volcano forming the island of the same name in the Red Sea. Measuring 5 km in length, it is the largest of a group of 10 small volcanic islands and shoals known as the Zubair archipelago, which includes the Zubair, Centre Peak, Saba, and Haycock islands.
A new eruption in Dec 2011 was first reported on 19 Dec 2011. The eruption lasted until mid January 2012 and produced a new island immediately NW of Rugged Island.

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Mt Jefferson volcano, one of the lesser known Cascade volcanoes, is the second highest mountain in Oregon. Although it is deeply eroded and has probably not erupted for at least about 1000 years, it is still considered active.

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Jingbo volcano (also known as Cingpo, Ching-pe, Chingpohu, or Jingbohu) is a young volcanic field in the Jingbo (or Jingpo) Lake area in NE China about 80 km SW of Mudanjiang city. The area is also known as the "Crater Forest" and "Frog Pool" areas.
The volcanic field contains cones and lava flows on top of plateaus above the Mudan River (Mudanjiang). The scenic Jingbohu lake ("Mirror Lake"), a major tourist attraction in the region, formed when lava flows blocked the Mudan River.

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Jolo volcano is a group of young cinder cones and explosion craters on the 60-km-wide Jolo Island located off the Zamboanga Peninsula on SW Mindanao Island in the southern Philippines 190 km NE of Sabah, Malaysia.
It is part of the Sulu arc and contains several young volcanic vents, including Mt. Dakula near Lake Panamo, the probably youngest cone of the island, Tumatangus volcano, at 811 m the highest point of the island, Bud Dajo (or Buddajo), a young basaltic cinder cone (620 m), and the cones of Matanding, Guimba, and Sungal.
Although not much sign of activity was detected during a survey in 1990, the last volcanic activity probably took place as recently as in 1897, when a submarine eruption accompanied by a tsunami was reported on 21 September. This activity most likely took place al Lake Seit, where a still active solfatara is found.
Hot springs also occur at the craters on Cagayan Sulu.
A reported eruption in 1641 most likely was the eruption of Parker volcano on Mindanao instead.

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Jordan Craters in SE Oregon is a field of well-preserved basaltic lava flows and scoria cones covering 250 sq km. The last eruption took place at Coffeepot Crater at the NW end of the lava field about 3200 years ago and produced a lava flow covering 75 square km and containing 1.6 km3 of olivine-bearing basaltic pahoehoe lava. The flows dammed local river valley, forming the two small Upper and Lower Cow Lakes at the SE end of the lava field.
Jordan Craters is known for its excellent exposures of a wide variety of lava flow features similar to Idaho's Snake River Plain to the east.

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