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Udina (russian: Удина) 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 ...
massif
In geology, a massif ( or ) is a section of a planet's crust that is demarcated by faults or flexures. In the movement of the crust, a massif tends to retain its internal structure while being displaced as a whole. The term also refers to a ...
located in the central part of the 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 ...
, Russia
Russia (, , ), or the Russian Federation, is a List of transcontinental countries, transcontinental country spanning Eastern Europe and North Asia, Northern Asia. It is the List of countries and dependencies by area, largest country in the ...
. It comprises two conical stratovolcanoes
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 peri ...
: Bolshaya Udina (2,920 m) and Malaya Udina (1,945 m).
The basaltic
Basalt (; ) is an aphanitic (fine-grained) extrusive igneous rock formed from the rapid cooling of low-viscosity lava rich in magnesium and iron (mafic lava) exposed at or very near the surface of a rocky planet or moon. More than 90% of a ...
Malaya Udina rises above a low saddle at the eastern end of the complex; small lava domes also occur on its flanks. This volcano is located within the Volcanoes of Kamchatka
The volcanoes of Kamchatka are a large group of volcanoes situated on the Kamchatka Peninsula, in eastern Russia. The Kamchatka River and the surrounding central side valley are flanked by large volcanic belts containing around 160 volcano ...
, a UNESCO World Heritage
A World Heritage Site is a landmark or area with legal protection by an international convention administered by the United Nations Educational, Scientific and Cultural Organization (UNESCO). World Heritage Sites are designated by UNESCO for h ...
site.
The andesitic
Andesite () is a volcanic rock of intermediate composition. In a general sense, it is the intermediate type between silica-poor basalt and silica-rich rhyolite. It is fine-grained (aphanitic) to porphyritic in texture, and is composed predomina ...
western volcano, Bolshaya Udina, has a prominent 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 on ...
on its southwestern flank. Bolshaya Udina, long believed to be extinct, has shown signs of seismic unrest and was re-classified as 'active' in June 2019.
View
See also
*List of volcanoes in Russia
This is a list of active and extinct volcanoes in Russia.
European Russia
Kamchatka
Volcanoes of the Kamchatka Peninsula of the northwestern Pacific Ocean and the Russian Far East.
Kuril Islands
Volcanoes of the Kuril Islands, in the nor ...
* List of ultras of Northeast Asia
This is a list of all the ultra prominent peaks (with topographic prominence greater than 1,500 metres) in Northeast Asia. There are 53 in total.
Baikal to Okhotsk
Eastern Siberia
Kamchatka
Kuril Islands
Korea and Manchuria
M ...
References
External links
* Mountains of the Kamchatka Peninsula Volcanoes of the Kamchatka Peninsula Stratovolcanoes of Russia {{KamchatkaKrai-geo-stub