A complex volcano, also called a compound volcano or a volcanic complex, is a mixed

landform A landform is a land feature on the solid surface of the Earth or other planetary body. They may be natural or may be anthropogenic (caused or influenced by human activity). Landforms together make up a given terrain, and their arrangement ...

consisting of related volcanic centers and their associated lava flows and

pyroclastic rock Pyroclastic rocks are clastic rocks composed of rock fragments produced and ejected by explosive volcanic eruptions. The individual rock fragments are known as pyroclasts. Pyroclastic rocks are a type of volcaniclastic deposit, which are deposit ...

. They may form due to changes in eruptive habit or in the location of the principal vent area on a particular volcano.

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

es can also form a large

caldera A caldera ( ) is a large cauldron-like hollow that forms shortly after the emptying of a magma chamber in a volcanic eruption. An eruption that ejects large volumes of magma over a short period of time can cause significant detriment to the str ...

that gets filled in by a lava dome, or else multiple small

cinder cone A cinder cone or scoria cone is a steep, volcanic cone, conical landform of loose pyroclastic rock, pyroclastic fragments, such as volcanic ash, clinkers, or scoria that has been built around a volcanic vent. The pyroclastic fragments are forme ...

lava dome In volcanology, a lava dome is a circular, mound-shaped protrusion resulting from the slow extrusion of viscous lava from a volcano. Dome-building eruptions are common, particularly in convergent plate boundary settings. Around 6% of eruptions ...

s and craters may develop on the caldera's rim. Although a comparatively unusual type of volcano, they are widespread in the world and in geologic history. Metamorphosed ash flow

tuff Tuff is a type of rock made of volcanic ash ejected from a vent during a volcanic eruption. Following ejection and deposition, the ash is lithified into a solid rock. Rock that contains greater than 75% ash is considered tuff, while rock co ...

s are widespread in the

Precambrian The Precambrian ( ; or pre-Cambrian, sometimes abbreviated pC, or Cryptozoic) is the earliest part of Earth's history, set before the current Phanerozoic Eon. The Precambrian is so named because it preceded the Cambrian, the first period of t ...

rocks of northern

New Mexico New Mexico is a state in the Southwestern United States, Southwestern region of the United States. It is one of the Mountain States of the southern Rocky Mountains, sharing the Four Corners region with Utah, Colorado, and Arizona. It also ...

, which indicates that caldera complexes have been important for much of Earth's history.

Yellowstone National Park Yellowstone National Park is a List of national parks of the United States, national park of the United States located in the northwest corner of Wyoming, with small portions extending into Montana and Idaho. It was established by the 42nd U ...

is on three partly covered caldera complexes. The

Long Valley Caldera Long Valley Caldera is a Depression (geology), depression in eastern California that is adjacent to Mammoth Mountain. The valley is one of the Earth's largest calderas, measuring about long (east-west), wide (north-south), and up to deep. Lo ...

in eastern

California California () is a U.S. state, state in the Western United States that lies on the West Coast of the United States, Pacific Coast. It borders Oregon to the north, Nevada and Arizona to the east, and shares Mexico–United States border, an ...

is also a complex volcano; the

San Juan Mountains The San Juan Mountains is a high and rugged mountain range in the Rocky Mountains in southwestern Colorado and northwestern New Mexico. The area is highly mineralized (the Colorado Mineral Belt) and figured in the gold and silver mining industry ...

in southwestern

Colorado Colorado is a U.S. state, state in the Western United States. It is one of the Mountain states, sharing the Four Corners region with Arizona, New Mexico, and Utah. It is also bordered by Wyoming to the north, Nebraska to the northeast, Kansas ...

are formed on a group of

Neogene The Neogene ( ,) is a geologic period and system that spans 20.45 million years from the end of the Paleogene Period million years ago ( Mya) to the beginning of the present Quaternary Period million years ago. It is the second period of th ...

-age caldera complexes, and most of the

Mesozoic The Mesozoic Era is the Era (geology), era of Earth's Geologic time scale, geological history, lasting from about , comprising the Triassic, Jurassic and Cretaceous Period (geology), Periods. It is characterized by the dominance of archosaurian r ...

and

Cenozoic The Cenozoic Era ( ; ) is Earth's current geological era, representing the last 66million years of Earth's history. It is characterized by the dominance of mammals, insects, birds and angiosperms (flowering plants). It is the latest of three g ...

rocks of

Nevada Nevada ( ; ) is a landlocked state in the Western United States. It borders Oregon to the northwest, Idaho to the northeast, California to the west, Arizona to the southeast, and Utah to the east. Nevada is the seventh-most extensive, th ...

Idaho Idaho ( ) is a landlocked U.S. state, state in the Pacific Northwest and Mountain states, Mountain West subregions of the Western United States. It borders Montana and Wyoming to the east, Nevada and Utah to the south, and Washington (state), ...

, and eastern California are also caldera complexes and their erupted ash flow tuffs. The Bennett Lake Caldera in

British Columbia British Columbia is the westernmost Provinces and territories of Canada, province of Canada. Situated in the Pacific Northwest between the Pacific Ocean and the Rocky Mountains, the province has a diverse geography, with rugged landscapes that ...

and the

Yukon Territory Yukon () is a territory of Canada, bordering British Columbia to the south, the Northwest Territories to the east, the Beaufort Sea to the north, and the U.S. state of Alaska to the west. It is Canada’s westernmost territory and the smallest ...

is another example of a Cenozoic (

Eocene The Eocene ( ) is a geological epoch (geology), epoch that lasted from about 56 to 33.9 million years ago (Ma). It is the second epoch of the Paleogene Period (geology), Period in the modern Cenozoic Era (geology), Era. The name ''Eocene'' comes ...

) caldera complex.

Examples

* Akita-Yake-Yama (Honshū, Japan) * Asacha (

Kamchatka Peninsula The Kamchatka Peninsula (, ) 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 western coastlines, respectively. Immediately offshore along the Pacific ...

, Russia) * Asama (Honshū, Japan) * Kusatsu-Shirane (Kusatsu, Gunma, Japan) * Banahaw (Luzon, Philippines) * Bennett Lake Caldera (British Columbia/Yukon, Canada) * Cumbre Vieja (Canary Islands, Spain) * Mount Edziza volcanic complex (British Columbia, Canada) * Galeras (Colombia, South America) * Grozny Group (Kuril Islands, Russia) *

Hakone is a List of towns in Japan, town in Kanagawa Prefecture, Japan. , the town had a population of 10,965, and total area of . Hakone is a notable spa town and a popular tourist destination due to its many onsen, hot springs being within view of ...

(Japan) * Homa Mountain (Kenya) * Irazú Volcano (Costa Rica) *

Ischia Ischia ( , , ) is a volcanic island in the Tyrrhenian Sea. It lies at the northern end of the Gulf of Naples, about from the city of Naples. It is the largest of the Phlegrean Islands. Although inhabited since the Bronze Age, as a Ancient G ...

(Italy) * Kelimutu (Flores, Indonesia) *

Las Pilas Las Pilas (or El Hoyo) is a complex volcano located in the western part of Nicaragua. Part of a 30-km-long volcanic massif, Las Pilas has a series of well-preserved flank vents surrounding a central cone. Las Pilas last erupted in the 1950s and ...

(Nicaragua) *

(California, United States) * Mount Marapi (Indonesia) * Mount Mazama (Oregon, United States) * McDonald Islands (Indian Ocean, Australia) * Mount Meager massif (British Columbia, Canada) *

Morne Trois Pitons Morne, Morné, Mörne, etc. may refer to: People * Morné (given name) * Morné (surname) * Arvid Mörne (1876-1946), a Finnish author and poet Places * Morne a Chandelle, a village in the Sud-Est department of Haiti * Morne-à-l'Eau, a commu ...

(Dominica) *

Moutohora Island Moutohora Island (previously known as Whale Island) () is a small uninhabited island located off the Bay of Plenty coast of New Zealand's North Island, about north of the town of Whakatāne. The island is a remnant of a complex volcano which ...

(New Zealand) * Pacaya (Guatemala) * Puyehue-Cordón Caulle (Chile) * Rincón de la Vieja Volcano (Costa Rica) * Silverthrone Caldera (British Columbia, Canada) * St. Andrew Strait (Admiralty Islands, Papua New Guinea) * Taal Volcano, (Batangas, Philippines) * Mount Talinis, (Negros Oriental, Philippines) * Taupō Volcano, (Taupō, New Zealand) * Teide, Canary Islands *

Three Sisters (Oregon) The Three Sisters are closely spaced volcanic peaks in the U.S. state of Oregon. They are part of the Cascade Volcanoes, Cascade Volcanic Arc, a segment of the Cascade Range in western North America extending from southern British Columbia through ...

(Oregon, United States) * Te Tatua-a-Riukiuta (Auckland, New Zealand) *

Tongariro Mount Tongariro (; ) is a complex volcano, compound volcano in the Taupō Volcanic Zone of the North Island of New Zealand. It is located to the southwest of Lake Taupō, and is the northernmost of the three active volcanoes that dominate the ...

, (New Zealand) *

Vesuvius Mount Vesuvius ( ) is a Somma volcano, 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 several volcanoes forming the Campanian volcanic arc. Vesuv ...

, (Italy) * Valles Caldera (New Mexico, United States) * Yellowstone Caldera (Wyoming, United States)

References

{{DEFAULTSORT:Complex Volcano Volcanic landforms

Examples

See also

References