Tephra

Tephra is fragmental material produced by a volcanic eruption regardless of composition, fragment size or emplacement mechanism.

Volcanologists also refer to airborne fragments as pyroclasms. Once clasts have fallen to the ground they remain as tephra unless hot enough to fuse together into pyroclastic rock or tuff.

Read more about TephraOverview

Other articles related to "tephra, tephras":

Tephrochronology
... technique that uses discrete layers of tephra—volcanic ash from a single eruption—to create a chronological framework in which paleoenvironmental or ... Such an established event provides a "tephra horizon" ... Thus, once the volcanic event has been independently dated, the tephra horizon will act as time marker ...
Dense-rock Equivalent
... magma ejected as pumice and volcanic ash, known as tephra during an explosive phase of the eruption, or the volume of lava extruded during an effusive phase of a volcanic eruption ... Historical and geological estimates of tephra volumes are usually obtained by mapping the distribution and thickness of tephra deposits on the ground after the eruption is over ... For historical volcanic explosions, further estimates must be made of tephra deposits that might have changed significantly over time by other ...
Volcanic Dam - Pyroclastic Dam
... emplacement or by the accumulation of widely variable pyroclastic particles, broadly termed tephra ... pyroclastic dams are produced by less coherent air-born gravity currents or falls of tephra particles from the atmosphere, which solidify on the surface more slowly from the inner portion outward pyroclastics are ... both laterally and vertically range from fiery surges, to hot flows, to warm falls of tephra the former may tend to emplace a dam directly while the latter tends to enhance ...
Tephra - Overview - Classification
... Tephra fragments are classified by size Ash - particles smaller than 2 mm (0.08 inches) in diameter Lapilli or volcanic cinders - between 2 and 64 mm (0.08 and 2.5 inches) in diameter Volcanic ... The words "tephra" and "pyroclast" both derive from Greek ... Tephra means "ash" ...
Valerie Hall - Recent Publications
... The most cited is "Dates of Holocene Icelandic volcanic eruptions from tephra layers in Irish peats" Pilcher, J.R ... (2000) Tephra-dated pollen studies of medieval landscapes in the north of Ireland ... In Tephras chronology and archaeology, (eds) E ...