| 11. | It contains a fumarole field, named Gayolesten.
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| 12. | At the summit, there are four large craters which contain active fumarole fields.
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| 13. | Fumarole Butte formed during the Jaramillo normal event, approximately one million years ago.
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| 14. | The fumarole on Deception Island also supports moss species found nowhere else in Antarctica.
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| 15. | Active fumarole fields are found in two crescentic basins to the north of Bukit Lumut.
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| 16. | At Vesuvius it occurs as alterations from gypsum within leucite tephrite and as fumarole deposits.
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| 17. | On 1 May 1989, a fumarole activity was observed by a pilot near the summit.
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| 18. | Fumarole activity was observed in 1962.
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| 19. | Binuluan exhibits active volcanism through numerous fumarole fields, solfataras and hot springs on its slope.
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| 20. | It is also the site of Fumarole Butte,, about east of the Drum Mountains.
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