San Joaquin is a forested
basalt
Basalt (; ) is an aphanite, 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 planetary surface, surface of a terrestrial ...
ic
shield volcano
A shield volcano is a type of volcano named for its low profile, resembling a shield lying on the ground. It is formed by the eruption of highly fluid (low viscosity) lava, which travels farther and forms thinner flows than the more viscous lava ...
forming the southeastern corner of
Equatorial Guinea
Equatorial Guinea, officially the Republic of Equatorial Guinea, is a country on the west coast of Central Africa. It has an area of . Formerly the colony of Spanish Guinea, its post-independence name refers to its location both near the Equ ...
's
Bioko Island
Bioko (; ; ; historically known as Fernando Pó, ) is an island of Equatorial Guinea. It is located south of the coast of Cameroon, and northwest of the northernmost part of mainland Equatorial Guinea. Malabo, on the north coast of the isl ...
. Its summit contains a small lake-filled
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 ...
and its northeastern flank is home to a
crater lake
Crater Lake ( Klamath: ) is a volcanic crater lake in south-central Oregon in the Western United States. It is the main feature of Crater Lake National Park and is a tourist attraction for its deep blue color and water clarity. T ...
. The geologic history of San Joaquin is poorly known but the
has classified the volcano as having been active in the last 2,000 years.
See also
*
List of volcanoes in Equatorial Guinea
This is a list of active and extinct Volcano, volcanoes in Equatorial Guinea.
References
{{Global Volcanism Program
Lists of volcanoes, Equatorial Guinea
Volcanoes of Equatorial Guinea,
Lists of landforms of Equatorial Guinea, Volca ...
References
Shield volcanoes of Equatorial Guinea
Polygenetic shield volcanoes
Calderas of Equatorial Guinea
{{EquatorialGuinea-geo-stub