U.S. National Atlas Volcanoes represents volcanoes thought to be active in the last 10,000 years (Holocene), in and near the United States. The data is a subset of data available from the Global Volcanism Program, Smithsonian Institution.
U.S. National Atlas Volcanoes provides the locations of volcanoes thought to be active in the last 10,000 years for geographic display and analysis at regional and national levels.
Largest scale when displaying the data: 1:1,000,000.
publication date
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The shapefile is converted to SDC (Smart Data Compression) format using either ESRI SDC Data Development Kit Professional 2 (DDKP2) or tools in ArcGIS. The SDC data set is then loaded into ArcSDE® to verify and validate the geometry.
After processing, the data set is checked for drawing display and number of records and file sizes compared with source materials.
The geospatial part of this data set was calculated from latitude/longitude coordinates. The positional accuracy is unknown. Note that some locations are the center point of broad volcanic fields, and that even at individual volcanoes the coordinates given do not necessarily match the eruption site. Tens of kilometers may separate eruptive centers of a single volcano, particularly in large caldera complexes and rift settings.
Attribute and geospatial data
The data was downloaded from the Global Volcanism Program Web site. West longitude and south latitude values were converted to negative values. The points that are within the geographic extent of the Shorelines for the National Atlas file were extracted. The file was loaded into ArcView and a shapefile was created.
The following steps were performed by ESRI: Downloaded the compressed file from the National Atlas of the United States® and uncompressed the shapefile (volcanx020.shp). Renamed and rearranged the attributes similar to last year. Removed all features except for those in North and Central America. Converted the data set to SDC. Created ArcGIS® layer file (.lyr), projection file (.prj), and spatial indices.
Internal feature number.
ESRI
Feature geometry.
ESRI
The volcano number, based on a system developed by the Catalog of Active Volcanoes of the World (CAVW), is in the format ####-##-. The first two numerals identify the region, the next two identify the subregion, and the last two or three (after the hyphen) identify individual volcanoes in that subregion. When there are three final characters and the last character is "=", the number is the same as that found in the CAVW; where the last character is "-", the number is not found in the CAVW because the region was not numbered in the CAVW or has been renumbered for this data set; where the last character is a number, the volcano is in an area included in the CAVW but the number is a new one that does not appear in the CAVW.
Global Volcanism Program, Smithsonian Institution
The location of the volcano by geographical and/or political area.
Global Volcanism Program, Smithsonian Institution
The name of the volcano.
Global Volcanism Program, Smithsonian Institution
The summit elevation of the volcano in meters above or below sea level.
Global Volcanism Program, Smithsonian Institution
The shape and size of the volcano (morphology).
National Atlas of the United States
A large volcanic collapse depression, commonly circular or elliptical when seen from above.
National Atlas of the United States
A steep-sided volcano formed by the explosive eruption of cinders that form around a vent.
National Atlas of the United States
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.
National Atlas of the United States
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.
National Atlas of the United States
A rounded, steep-sided mount that forms when very viscous lava is extruded from a volcanic vent.
National Atlas of the United States
Shallow, flat-floored craters 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.
National Atlas of the United States
A volcanic cone composed of fragmented material ejected from a volcano.
National Atlas of the United States
A volcano with long, gentle slopes composed of ejected fragmental material.
National Atlas of the United States
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.
National Atlas of the United States
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.
National Atlas of the United States
A steep-sided volcano possibly built by lava flows and tephra deposits. Tephra is solid material of all sizes explosively ejected from a volcano into the atmosphere.
National Atlas of the United States
A volcanic form produced by eruptions beneath a glacier or beneath the surface of a lake within a glacier.
National Atlas of the United States
A volcanic form produced by eruptions in the ocean.
National Atlas of the United States
A possible volcanic form produced by eruptions in the ocean.
National Atlas of the United States
A volcanic cone formed by the interaction of basaltic magma and water.
National Atlas of the United States
Shallow, flat-floored craters formed by the interaction of magma and water.
National Atlas of the United States
A collection of cinder cones and (or) lava flows.
National Atlas of the United States
The volcano morphology is not known.
National Atlas of the United States
The type of evidence used to determine volcanic activity.
Global Volcanism Program, Smithsonian Institution
Volcanoes with undated but recent activity described in native legends as well as activity dated by buried artifacts.
Global Volcanism Program, Smithsonian Institution
Volcanoes for which dating of eruptions is based on the study of tree ring growth.
Global Volcanism Program, Smithsonian Institution
Volcanoes for which evidence of activity is based on steam and volcanic gas, or fume, reaching the surface.
Global Volcanism Program, Smithsonian Institution
Volcanoes with eruptions documented during or shortly after observation.
Global Volcanism Program, Smithsonian Institution
Volcanoes without dated products but that are virtually certain to have been active in postglacial time.
Global Volcanism Program, Smithsonian Institution
Volcanoes without dated products but where there is some certainty that they have been active in postglacial time.
Global Volcanism Program, Smithsonian Institution
Volcanoes for which evidence of activity is based on a large amount of hot water at the surface.
Global Volcanism Program, Smithsonian Institution
Volcanoes for which evidence of activity is based on postglacial steam and volcanic gas, or fume, reaching the surface.
Global Volcanism Program, Smithsonian Institution
Volcanoes for which evidence of activity and dating is based on potassium-argon dating methods.
Global Volcanism Program, Smithsonian Institution
Volcanoes for which evidence of activity and dating is based on radiocarbon methods.
Global Volcanism Program, Smithsonian Institution
Volcanoes for which evidence of activity and dating is based on volcanic ash beds and tuffs.
Global Volcanism Program, Smithsonian Institution
Volcanoes with possible Holocene activity, but with questionable documentation.
Global Volcanism Program, Smithsonian Institution
Volcanoes for which evidence of activity and dating is based on annual layers of sediment.
Global Volcanism Program, Smithsonian Institution
The age of the volcanic eruption.
Global Volcanism Program, Smithsonian Institution
The last known eruption in 1964 or later.
Global Volcanism Program, Smithsonian Institution
The last known eruption from 1900-1963, inclusive.
Global Volcanism Program, Smithsonian Institution
The last known eruption from 1800-1899, inclusive.
Global Volcanism Program, Smithsonian Institution
The last known eruption from 1700-1799, inclusive.
Global Volcanism Program, Smithsonian Institution
The last known eruption from 1500-1699, inclusive.
Global Volcanism Program, Smithsonian Institution
The last known eruption from A.D. 1-1499, inclusive.
Global Volcanism Program, Smithsonian Institution
The last known eruption B.C. (Holocene).
Global Volcanism Program, Smithsonian Institution
Quaternary eruption(s) with the only known Holocene activity being hydrothermal.
Global Volcanism Program, Smithsonian Institution
Undated, but probable Holocene eruption.
Global Volcanism Program, Smithsonian Institution
Uncertain Holocene eruption.
Global Volcanism Program, Smithsonian Institution
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The SDC file contains the geospatial and attribute data. The SDI file contains the spatial index. The PRJ file contains the coordinate system information (optional). The XML file (*.sdc.xml) contains the metadata describing the data set (optional).
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