noun
definition
The solid material thrown into the air by a volcanic eruption that settles on the surrounding areas.
Examples of tephra in a Sentence
The grayish volcanic tephra is unique to each eruption and can be identified microscopically.
To survey the main building types in the areas principally at risk and to assess their vulnerability to pyroclastic flow and tephra fall damage.
The only historical event (AD 1886) erupted 1.3 km3 of purely basaltic tephra fallout killing about 150 people.
Tephra analysis was carried out in order to observe possible isochrones, which were then used to form a relative chronology.
Initial results suggest a clear developmental sequence on the flows that have not been disturbed by tephra deposition.
The majority of tephra horizons within a sequence can be distinguished on the basis of major or trace element chemistry.
As the tephra layers can also be accurately dated you have a great series of time points to assign any fossils to.
We have applied this UV laser system to the analysis of single shards from Miocene tephra deposits from the Ruby Range in southwest Montana.