SWEET Ontology
type: Ontology
version info: 2.3
imports: phenGeol.owl
imports: realmGeol.owl
imports: matrSediment.owl
imports: propMass.owl
imports: propEnergy.owl
imports: phenReaction.owl
imports: rela.owl
imports: relaPhysical.owl
imports: matrRockIgneous.owl
imports: phenFluidTransport.owl

VolcanicEruption
type: Class
subclass of: VolcanicActivity
subclass of: Eruption
subclass of: Restriction
  some values from: Mass
  on property: hasTransport
subclass of: Restriction
  some values from: Heat
  on property: hasTransport
comment: Moderate to violent ejection of solid or very viscous hot fragments of new lava in short-lived, cannon-like bursts. Ash and fine ash are emitted with gases and ascend to form a cauliflower-like eruption cloud.

FlankEruption
type: Class
subclass of: VolcanicEruption
comment: An eruption from the side of a volcano (in contrast to a summit eruption.)

LavaOfTephra
type: Class
subclass of: Lava
comment: Tephra is air-fall material (of any size) produced by a volcanic eruption regardless of composition or fragment size. [Wikipedia]

MantlePlume
type: Class
subclass of: VolcanicPlume
equivalent class: MantleThermalPlume
subclass of: Restriction
  on property: hasRealm
  all values from: Mantle
comment: A mantle plume is an upwelling of abnormally hot rock within the Earth's mantle. As the heads of mantle plumes can partly melt when they reach shallow depths, they are thought to be the cause of volcanic centers known as hotspots and probably also to have caused flood basalts. [Wikipedia]

VolcanicActivity
type: Class
subclass of: GeospherePhenomena
subclass of: Restriction
  on property: hasPhenomena
  some values from: Volcanism
equivalent class: VolcanicPhenomena
comment: A geophysical phenomena involving the extrusion of rock that tends to form mountains or features like mountains over a period of time. [Wikipedia]

Magmatic
type: Class
subclass of: VolcanicEruption
comment: Eruption Type 1 - produce juvenile clasts during explosive decompression from gas release. [Wikipedia]

PeleeanEruption
type: Class
subclass of: VolcanicEruption
equivalent class: NueeArdenteEruption
comment: In a Peléan eruption or nuée ardente (glowing cloud) eruptions a large amount of gas, dust, ash, and lava fragments are blown out of a central crater, fall back, and form avalanches that move downslope at speeds as great as 160 km per hour. These eruptions are usually associated with silicic magmas. A name for some pyroclastic flows is nuée ardente (French for "glowing cloud"); this was first used to describe the disastrous 1902 eruption of Mount Pelée on Martinique.[3] These pyroclastic flows glowed red in the dark. [Wikipedia]

PhreaticEruption
type: Class
comment: Phreatic eruption is an explosion that follows the transformation of groundwater into steam. No incandescent or juvenile material is erupted.
subclass of: VolcanicEruption

SteamBlastEruption
type: Class
equivalent class: PhreaticEruption
comment: A series of hundreds of steam explosions preceding an eruption of the volcano A less intense geothermal event may result in a mud volcano. In 1949, Thomas Jaggar described this kind of activity as steam-blast eruptions. [Wikipedia]

PhreatomagmaticEruption
type: Class
subclass of: VolcanicEruption
comment: Eruption Type 2 - Ejection of entrained particles during steam eruptions. [Wikipedia]

PlinianEruption
type: Class
comment: Plinian eruptions are characterized by paroxysmal ejection of large volume of ash and pumice as a well-defined eruption column or "jet;" often precedes caldera collapse. The resulting tephra fallout covers an area of more than 500 square kilometers.
subclass of: VolcanicEruption

StrombolianEruption
type: Class
subclass of: VolcanicEruption
comment: Strombolian Eruptions are characterised by huge clots of molten lava bursting from the summit crater to form luminous arcs through the sky. Collecting on the flanks of the cone, lava clots combine to stream down the slopes in molten rivulets. The explosions are driven by bursts of gas slugs that rise faster than surrounding magma

Surge
type: Class
subclass of: VolcanicPlume
comment: A ring-shaped cloud of gas and suspended solid debris that moves radially outward at high velocity as a density flow from the base of a vertical eruption column accompanying a volcanic eruption or crater formation.

VolcanicPlume
type: Class
subclass of: VolcanicPhenomena
comment: An eruption column of hot volcanic ash and gas emitted into the atmosphere during an explosive volcanic eruption. [Wikipedia]
subclass of: Plume

EruptionCloud
type: Class
subclass of: Ejecta
subclass of: VolcanicPhenomena
comment: The column of gases, ash, and larger rock fragments rising from a crater or other vent. If it is of sufficient volume and velocity, this gaseous column may reach many miles into the stratosphere, where high winds will carry it long distances.