A somma volcano (also known as a sommian) is a

volcanic 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 ...

caldera A caldera ( ) is a large cauldron-like hollow that forms shortly after the emptying of a magma chamber in a volcano eruption. When large volumes of magma are erupted over a short time, structural support for the rock above the magma chamber ...

that has been partially filled by a new central

cone A cone is a three-dimensional geometric shape that tapers smoothly from a flat base (frequently, though not necessarily, circular) to a point called the apex or vertex. A cone is formed by a set of line segments, half-lines, or lines co ...

. The name comes from

Mount Somma Mount Somma ( it, Monte Somma) is a mountain located in the Province of Naples, in the Campania region of southern Italy. Mount Somma is an integral part of the Somma–Vesuvius volcanic complex. It is high. Geography Mount Somma is the re ...

, a

stratovolcano A stratovolcano, also known as a composite volcano, is a conical volcano built up by many layers (strata) of hardened lava and tephra. Unlike shield volcanoes, stratovolcanoes are characterized by a steep profile with a summit crater and p ...

in southern Italy with a summit caldera in which the upper cone of

Mount Vesuvius Mount Vesuvius ( ; it, Vesuvio ; nap, 'O Vesuvio , also or ; la, Vesuvius , also , or ) is a somma- stratovolcano located on the Gulf of Naples in Campania, Italy, about east of Naples and a short distance from the shore. It is one of ...

has grown. A number of Earth's best examples of somma volcanoes are found on Russia's

Kamchatka Peninsula The Kamchatka Peninsula (russian: полуостров Камчатка, Poluostrov Kamchatka, ) is a peninsula in the Russian Far East, with an area of about . The Pacific Ocean and the Sea of Okhotsk make up the peninsula's eastern and we ...

and the

Kuril Islands The Kuril Islands or Kurile Islands (; rus, Кури́льские острова́, r=Kuril'skiye ostrova, p=kʊˈrʲilʲskʲɪjə ɐstrɐˈva; Japanese: or ) are a volcanic archipelago currently administered as part of Sakhalin Oblast in the ...

that stretch south from Kamchatka to Hokkaidō (Japan). Some examples of somma volcanoes are the following: * Africa ** Pico do Fogo ( Fogo Island, Cape Verde) **

Teide Teide, or Mount Teide, ( es, El Teide, Pico del Teide, , "Peak of Teide") is a volcano on Tenerife in the Canary Islands, Spain. Its summit (at ) is the highest point in Spain and the highest point above sea level in the islands of the Atlan ...

(

Tenerife Tenerife (; ; formerly spelled ''Teneriffe'') is the largest and most populous island of the Canary Islands. It is home to 43% of the total population of the Archipelago, archipelago. With a land area of and a population of 978,100 inhabitant ...

Canary Islands The Canary Islands (; es, Canarias, ), also known informally as the Canaries, are a Spanish autonomous community and archipelago in the Atlantic Ocean, in Macaronesia. At their closest point to the African mainland, they are west of Mo ...

, Spain) * Americas ** Cosigüina (

Chinandega Chinandega () is a city and the departmental seat of Chinandega department in Nicaragua. It is also the administrative centre of the surrounding municipality of the same name. It is Nicaragua's 2nd most important city (economy) and 6th largest ...

, Nicaragua) ** Wizard Island (

Oregon Oregon () is a state in the Pacific Northwest region of the Western United States. The Columbia River delineates much of Oregon's northern boundary with Washington, while the Snake River delineates much of its eastern boundary with Idah ...

, United States) ** Lava domes (

Mount St. Helens Mount St. Helens (known as Lawetlat'la to the indigenous Cowlitz people, and Loowit or Louwala-Clough to the Klickitat) is an active stratovolcano located in Skamania County, Washington, in the Pacific Northwest region of the United St ...

, Washington, United States) * Asia **

Ebeko Ebeko (russian: Эбеко) is a highly active somma volcano located on the northern end of Paramushir Island, Kuril Islands, Russia. It is one of the most active volcanoes of the Kuril Islands. Eleven eruptions have been recorded between 1793 an ...

( Paramushir Island, Kuril Islands, Russia) ** Gunung Baru Jari ( Segara Anak caldera,

Lombok Lombok is an island in West Nusa Tenggara province, Indonesia. It forms part of the chain of the Lesser Sunda Islands, with the Lombok Strait separating it from Bali to the west and the Alas Strait between it and Sumbawa to the east. It is ...

, Indonesia) ** Kolokol Group: Kolokol, Berg, Borzov, Trezubetz ( Urup Island, Kuril Islands, Russia) ** Anak Krakatoa ( Krakatoa archipelago,

Sunda Strait The Sunda Strait ( id, Selat Sunda) is the strait between the Indonesian islands of Java and Sumatra. It connects the Java Sea with the Indian Ocean. Etymology The strait takes its name from the Sunda Kingdom, which ruled the western portion ...

Lampung Lampung ( Lampung: ), officially the Province of Lampung ( id, Provinsi Lampung) is a province of Indonesia. It is located on the southern tip of the island of Sumatra. It has a short border with the province of Bengkulu to the northwest, an ...

, Indonesia): a partially-submerged nested somma volcano (with a central cone within a caldera which is itself within a larger caldera). ** Krenitsyn Peak ( Tao-Rusyr caldera,

Onekotan Island Onekotan (russian: Онекотан; Japanese 温禰古丹島; Onekotan-tō, occasionally Onnekotan-tō, ain, オネコタン　or　オネコタㇴ) is an uninhabited volcanic island located near the northern end of the Kuril Islands chain in t ...

, Kuril Islands, Russia) ** Medvezhya (

Iturup Island , other_names = russian: Итуру́п; ja, 択捉島 , location = Sea of Okhotsk , coordinates = , archipelago = Kuril Islands , total_islands = , major_islands = , area_km2 = 3139 , length_km = 200 , width_km = 27 , coastline = , highest_moun ...

, Kuril Islands, Russia) ** Milna ( Simushir Island, Kuril Islands, Russia) ** Pinatubo (

Central Luzon Central Luzon ( pam, (Reyun ning) Kalibudtarang Luzon, pag, (Rehiyon na) Pegley na Luzon, tgl, (Rehiyon ng) Gitnang Luzon, ilo, (Rehion/Deppaar ti) Tengnga ti Luzon), designated as Region III, is an administrative region in the Philippines, ...

, Philippines) ** Tengger caldera (

East Java East Java ( id, Jawa Timur) is a province of Indonesia located in the easternmost hemisphere of Java island. It has a land border only with the province of Central Java to the west; the Java Sea and the Indian Ocean border its northern and so ...

, Indonesia) ** Tondano caldera (

North Sulawesi North Sulawesi ( id, Sulawesi Utara) is a province of Indonesia. It is located on the Minahasa Peninsula of Sulawesi, south of the Philippines and southeast of Sabah, Malaysia. It borders the Philippine province of Davao Occidental and Socc ...

, Indonesia) ** Sakurajima ( Aira caldera, Kyūshū, Japan) **

Tyatya Tyatya (russian: Тятя, also spelled Tiatia and known as Chachadake (爺爺岳) in Japanese) is a volcano located in the northeastern part of Kunashir Island, Kuril Islands, Russia. It is the highest peak on the island with an elevation of . ...

(

Kunashir Island , other_names = kz, Kün Ashyr; ja, 国後島 , location = Sea of Okhotsk , locator_map = File:Kurily Kunashir.svg , coordinates = , archipelago = Kuril Islands , total_islands = , major_islands = , area = , length = , width = fr ...

, Kuril Islands, Russia) ** Urataman ( Simushir Island, Kuril Islands, Russia) ** Zarechny (Kamchatka Peninsula, Russia) * Europe ** Nea Kameni (

Santorini caldera Santorini caldera is a large, mostly submerged caldera, located in the southern Aegean Sea, 120 kilometers north of Crete in Greece. Visible above water is the circular Santorini island group, consisting of Santorini (classic Greek Thera), the ma ...

, Greece): a partially-submerged somma volcano **

Mount Pico Mount Pico ( pt, Montanha do Pico) is a currently quiescent stratovolcano located on Pico Island, in the mid-Atlantic archipelago of the Azores. It is the highest mountain in Portugal, at above sea level, and is one of the highest Atlantic mount ...

(

Azores ) , motto= ( en, "Rather die free than subjected in peace") , anthem=( en, "Anthem of the Azores") , image_map=Locator_map_of_Azores_in_EU.svg , map_alt=Location of the Azores within the European Union , map_caption=Location of the Azores wi ...

, Portugal) **

(

Campania (man), it, Campana (woman) , population_note = , population_blank1_title = , population_blank1 = , demographics_type1 = , demographics1_footnotes = , demographics1_title1 = , demographics1_info1 = , demog ...

, Italy) * Oceania ** Mount Gharat ( Gaua, Vanuatu)

See also