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 a ...

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 is ...

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 con ...

. 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 rem ...

, 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 per ...

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 s ...

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 is Japan's second largest island and comprises the largest and northernmost prefecture, making up its own region. The Tsugaru Strait separates Hokkaidō from Honshu; the two islands are connected by the undersea railway Seikan Tunnel. The la ...

(Japan). Some examples of somma volcanoes are the following: * Africa **

Pico do Fogo Pico do Fogo is the highest peak of Cape Verde and West Africa, rising to above sea level. It is an active stratovolcano lying on the island of Fogo. The main cone last erupted in 1680, causing mass emigration from the island. A subsidiary vent ...

( 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. With a land area of and a population of 978,100 inhabitants as of Janu ...

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 Morocc ...

, Spain) * Americas **

Cosigüina Cosigüina (also spelt Cosegüina) is a stratovolcano located in the western part of Nicaragua. It forms a large peninsula extending into the Gulf of Fonseca. The summit is truncated by a large caldera, 2 x 2.4 km in diameter and 500 m ...

(

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 c ...

, Nicaragua) **

Wizard Island Wizard Island is a volcanic cinder cone which forms an island at the west end of Crater Lake in Crater Lake National Park, Oregon. The top of the island reaches above sea level, about above the average surface of the lake. The cone is cap ...

(

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

, 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 Washington commonly refers to: * Washington (state), United States * Washington, D.C., the capital of the United States ** A metonym for the federal government of the United States ** Washington metropolitan area, the metropolitan area centered o ...

, 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 and ...

(

Paramushir Island russian: Парамушир ja, 幌筵島 , native_name_link = , nickname = , location = Pacific Ocean , coordinates = , archipelago = Kuril Island , total_islands = , major_islands = , area_km2 = 2053 , length_km = 100 , width_km = 20 ...

, Kuril Islands, Russia) ** Gunung Baru Jari (

Segara Anak Segara Anak is a crater lake in the caldera that formed during the explosive volcanic eruption of Mount Samalas in 1257. The caldera is next to Mount Rinjani on Lombok Island in Indonesia. "Segara Anak" means "child of the sea" and refers to the ...

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 rou ...

, Indonesia) **

Kolokol Group Kolokol Group (russian: Группа Колокола, Gruppa Kolokola) is a group of somma volcanoes located in the central part of Urup Island, Kuril Islands, Russia. The group is named after its highest volcano but also includes volcanoes calle ...

: Kolokol, Berg, Borzov, Trezubetz (

Urup Island Urup ( ja, 得撫島, Uruppu-to; russian: Уру́п, Urúp, ain, ウルㇷ゚, Urup) is an uninhabited volcanic island in the Kuril Islands chain in the south of the Sea of Okhotsk, northwest Pacific Ocean. Its name is derived from the Ainu la ...

, Kuril Islands, Russia) **

Anak Krakatoa Anak Krakatoa ( id, Anak Krakatau)English translation and common name: ''Child of Krakatoa'' is a volcanic island in Indonesia. On 29 December 1927, Anak Krakatoa first emerged from the caldera formed in 1883 by the explosive volcanic eruption ...

(

Krakatoa archipelago The Krakatoa Archipelago is a small uninhabited archipelago of volcanic islands formed by the Krakatoa stratovolcano located in the Sunda Strait, nestled between the much larger islands of Java and Sumatra. As of 2018, the archipelago consists ...

Sunda Strait The Sunda Strait ( id, Selat Sunda) is the strait between the Indonesian islands of Java island, 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 weste ...

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, and a ...

, 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 Tao-Rusyr Caldera (russian: Тао-Русыр) is a stratovolcano located at the southern end of Onekotan Island, Kuril Islands, Russia. It has 7.5 km wide caldera formed during a catastrophic eruption less than 10,000 years ago (reported a ...

, Onekotan Island, Kuril Islands, Russia) **

Medvezhya Medvezhya (russian: Медве́жий; ja, 茂世路岳, ''Moyoro-dake'') is a volcanic complex located at the northern end of Iturup Island, Kuril Islands, Russia. Rheniite, a rhenium sulfide mineral (ReS2), was discovered and approved in 20 ...

(

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 Milna is a village and municipality on the western side of the island of Brač, Split-Dalmatia County, Croatia. The village has a population of 833. It is situated in a deep bay oriented towards the island of Mrduja and Split Channel, on the ...

(

Simushir Island Simushir (russian: Симушир, ja, 新知島, translit=Shimushiru-tō, ain, シムシㇼ, translit=Simusir), meaning ''Large Island'' in Ainu, is an uninhabited volcanic island near the center of the Kuril Islands chain in the Sea of Okhots ...

, 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 The Bromo ( jv, ꦧꦿꦩ), or Mount Bromo ( jv, ꦒꦸꦤꦸꦁꦧꦿꦩ Pegon: , Gunung Bromo) is an active somma volcano and part of the Tengger mountains, in East Java, Indonesia. At it is not the highest peak of the massif, but t ...

(

East Java East Java ( id, Jawa Timur) is a Provinces of Indonesia, 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 bord ...

, 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 Soccsks ...

, Indonesia) **

Sakurajima Sakurajima ( ja, 桜島, literally "Cherry Blossom Island") is an active stratovolcano, formerly an island and now a peninsula, in Kagoshima Prefecture in Kyushu, Japan. The lava flows of the 1914 eruption connected it with the Ōsumi Peninsul ...

(

Aira caldera Aira Caldera is a gigantic volcanic caldera that is located on the southern end of Kyushu, Japan. It is believed to have been formed about 30,000 years ago with a succession of pyroclastic surges. It is currently the place of residence to over ...

Kyūshū is the third-largest island of Japan's five main islands and the most southerly of the four largest islands ( i.e. excluding Okinawa). In the past, it has been known as , and . The historical regional name referred to Kyushu and its surround ...

, 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 = f ...

, Kuril Islands, Russia) **

Urataman Uratman (russian: Уратман) is a somma volcano located at the northern end of Simushir Island, Kuril Islands, Russia. It overlooks the Brouton Bay which is contained within the crater. The volcano consists of a Pleistocene caldera which con ...

(

, Kuril Islands, Russia) ** Zarechny (Kamchatka Peninsula, Russia) * Europe **

Nea Kameni Nea Kameni is a small uninhabited Greek island of volcanic origin located in the Aegean Sea, within the flooded Santorini caldera. Nea Kameni and the neighbouring small island Palea Kameni (the new and old burnt islands) have formed over the ...

(

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 Campania (, also , , , ) is an administrative Regions of Italy, region of Italy; most of it is in the south-western portion of the Italian peninsula (with the Tyrrhenian Sea to its west), but it also includes the small Phlegraean Islands and the i ...

, Italy) * Oceania **

Mount Gharat Mount Gharat or Mount Garet (797 m), a somma volcano, is the highest peak on the volcanic island of Gaua of the Banks Islands in northern Vanuatu. Geography The peak is located at the centre of the island, is volcanically active and is surround ...

(

Gaua Gaua (formerly known as ''Santa Maria Island'') is the largest and second most populous of the Banks Islands in Torba Province in northern Vanuatu. It covers 342 km². History Gaua was first sighted by Europeans during the Spanish expeditio ...

, Vanuatu)

See also