tephra


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tephra

[′tef·rə]
(geology)
All pyroclastics of a volcano.
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It looks as if the harbour has been there forever, whereas in fact a large chunk of it is ten years younger than even Surtsey and was added to the island's territory as a direct result of the eruption, when about 300 million cubic yards of lava and 26 million cubic yards of tephra were generously deposited on Heimaey.
This tephra horizon, made up of ash from the eruption of Vatnaoldur, is generally known, on account of its coincidence with the first Norse settlement, as the 'landnam tephra'.
A wall fragment found below a layer of tephra deposited around 871 confirms information from other sources about the settlement of Iceland by a Norwegian exodus in the late ninth century The settlers were people uncomfortable with the nationalistic (and taxation) ambitions of Harald Fairhair, the Norwegian king who managed to unify Norway around 872.
2), is used as a reference eruption, since the distribution of ignimbrite and tephra erupted is well documented.
More affected areas belongs to areas with important thickness of Tierra Blanca Joven (TBJ) which is a volcanic tephra, product of the last plinian eruption of the Ilopango caldera that covers most of the surface of the MASS.
Comanche started out as a volcanic ash deposit known as tephra that originally covered the Columbia Hills and adjacent plains.
Topics of the other ten papers include avalanche deposits at Volcan Baru in Panama, hazards at the Sierra Chichinautzin monogenetic volcanic field, and estimation of tephra fall and lahar potential at Hudson volcano.
Incorporating restoration in sustainable forestry management: using pinebark mulch to improve native species establishment on tephra deposits.
En el presente articulo se evaluara la aplicabilidad del programa TEPHRA modificado, a la amenaza que representa la caida de ceniza proveniente del Volcan Irazu.
In studies of vegetational recovery from the volcanic tephra (ash and silt) deposited by this eruption, E.