tephra

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teph·ra

 (tĕf′rə)
n.
Solid matter that is ejected into the air by an erupting volcano.
[Greek tephrā, ash; see dhegwh- in Indo-European roots.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

tephra

(ˈtɛfrə)
n
(Geological Science) chiefly US solid matter ejected during a volcanic eruption
[C20: Greek, literally: ashes]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

teph·ra

(tĕf′rə)
Solid matter, such as ash, dust, and cinders, that is ejected into the air by an erupting volcano.
The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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References in periodicals archive ?
Tephras layers were identified at 1.5 cm (olivine-diopside of Stromboli, AD 1930) and 9 cm (Augite-diopside of Vesuvius, December 17, AD 1631).
Magnetic study of the heated and unheated sedimentary fillings of sebkha Mhabeul, Southeast Tunisia: a geophysical method for paleoclimatic investigation and tephrochronological dating
Improved age estimates for the White River and Bridge River tephras, western Canada.
Effects of the White River Ash event on aquatic environments, southwest Yukon, Canada
Ordovician K-bentonites: issues in interpreting and correlating ancient tephras. Quaternary International, 178, 276-287.
Geochemistry and correlation of volcanic ash beds from the Rootsikula Stage (Wenlock-Ludlow) in the eastern Baltic / Rootsikula lademe vulkaaniliste kihtide geokeemia ja korrelatsioon Ida-Baltikumis
D RECENT AND HISTORICAL TEPHRAS RIO MOLINO PYROCLASTIC FLOWS 3100 and B.P.
Field guides for excursions to the Nevado del Ruiz Volcano and to the Romeral Fault System (Colombia), in the frame of the Neotectonics of arc-continent collision concepts
Holocene tephras from Kandrian, the Huon Peninsula, and Mount Giluwe, Papua New Guinea.
Diversity in lithic raw material sources on New Britain, Papua New Guinea
Comparison of selected soil properties from the 3 Turangi stands of different age sampled under manuka and kanuka in February 1997 and from sites under indigenous forests of mixed angiosperm and conifer species growing in soils formed in rhyolitic tephras of volcanic origin (e.
Nitrogen and carbon cycling in a New Zealand pumice soil under a manuka (Leptospermum scoparium) and kanuka (Kunzea ericoides) shrubland
A stratified series of volcanic tephras can be easily differentiated by macroscopic traits such as colour and texture as well as with geochemical analyses.
Social networks and the spread of Lapita
These compositions are typical of many of the late Cenozoic tephras of western North America.
A 10 million year old ash deposit in the Ogallala Formation of the Texas Panhandle
Detailed stratigraphic work in the Shimanto belt of Japan, for example, showed an orderly sequence before disruption: oceanic basement (basalts), pelagic sediments, hemipelagic sediments with silicic tephras and muddy turbidites, and coarser grained turbidites, basically similar to that found in the Nankai Trough.
When plates collide: convergent-margin geology
Eruptive products range from ignimbrites (calc-alkaline dacites), lava flows and tephras (tholeiitic basalts and basaltic andesites).
A large hydrothermal reservoir beneath Taal volcano (Philippines) revealed by magnetotelluric observations and its implications to the volcanic activity

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