Tweets about "Volcano"
Volcano Finder Lookup Maps:
Use the above map to select the region you want to search for volcanoes. You can do a zoom in search my using the search menu. The menu has both volcano name and volcano number.
Also, country names can be searched for in the menu to quickly find general search locations for a volcano(s).
You can also click on the red dots for the volcano information.
These four maps cut the World into four manageable sections based on latitude and longitude.
Key to Volcano Finder Maps:
Caldera - A large volcanic collapse depression, commonly circular or elliptical when seen from above.
Cinder cone - A steep-sided volcano formed by the explosive eruption of cinders that form around a vent.
Complex volcano - A volcano composed of a mixture of landforms. In most cases, they occur because of changes either in eruptive habit or in location of the principal vent area.
Crater rows - An area of congealed lava produced by isolated lava fountains along a fissure (volcanic vent).
Fissure vent - Linear volcanic vents through which lava erupts, usually without any explosive activity. The vents are usually a few meters wide and may be many kilometers long.
Fumarole field - Areas where there are cracks in the ground that allow gases to reach the surface.
Hydrothermal field - An area where water heated by magma or in association with magma reaches the surface.
Lava dome - A rounded, steep-sided mount that forms when very viscous lava is extruded from a volcanic vent.
Maars - Shallow, flat-floored craters formed above diatremes (volcanic vents or pipes drilled through rocks by the explosive energy of gas-charged magmas) as a result of a violent expansion of magmatic gas or steam. Maars often fill with water to form a lake.
Pyroclastic cone - A volcanic cone composed of fragmented material ejected from a volcano.
Scoria cones - A steep-sided volcano formed by the explosive eruption of
scoria. Scoria is formed when blobs of gas-charged lava are thrown into the air during an eruption and cool in flight, falling as dark volcanic rock containing cavities created by trapped gas bubbles.
Shield volcano - A volcano that resembles an inverted warrior's shield, with broad, gentle slopes, built by multiple eruptions of fluid basalt lava. Basalt lava tends to build enormous, low-angle cones because it flows across the ground easily and can form lava tubes that enable lava to flow tens of kilometers from an erupting vent with very little cooling.
Somma volcano - A large volcanic collapse depression that is partially filled by a new central cone.
Stratovolcano - A steep-sided volcano built by lava flows and tephra deposits. Tephra is solid material of all sizes explosively ejected from a volcano into the atmosphere.
Subglacial volcano - A volcanic form produced by eruptions beneath a glacier or beneath the surface of a lake within a glacier.
Submarine volcano - A volcanic form produced by eruptions in the ocean.
Tuff cone - A volcanic cone formed by the interaction of basaltic magma and water.
Tuff rings - Shallow, flat-floored craters formed by the interaction of magma and water.
Volcanic field - A collection of cinder cones and (or) lava flows.
Volanco eruption time frame:
Last known eruption B.C. (Holocene)
Last known eruption in 1964 or later.
Last known eruption from 1900-1963, inclusive.
Last known eruption from 1800-1899, inclusive.
Last known eruption from 1700-1799, inclusive.
Last known eruption from 1500-1699, inclusive.
Last known eruption from A.D. 1-1499, inclusive.
Last known eruption B.C. (Holocene)
Quaternary eruption(s) with the only known Holocene activity being hydrothermal.
Undated, but probable Holocene eruption.
Uncertain Holocene eruption.
Cool Volcano Links:
Source: National Atlas of the United States, Smithsonian Institution, ESRI