Results 31 to 40 of about 5,095 (245)

Probabilistic Source Classification of Large Tephra Producing Eruptions Using Supervised Machine Learning: An Example From the Alaska‐Aleutian Arc

Geochemistry, Geophysics, Geosystems, 2023
Alaska contains over 130 volcanoes and volcanic fields that have been active within the last 2 million years. Of these, roughly 90 have erupted during the Holocene, with many characterized by at least one large explosive eruption.
Jordan Lubbers, Matthew Loewen, Kristi Wallace, Michelle Coombs, Jason Addison   +4 more
doaj   +1 more source

Tephrochronology of a distal tonstein layer within the Maritsa East lignite basin, Bulgaria: Potential sources of the Miocene large explosive eruption

Geologica Carpathica, 2022
: This contribution presents the age of the detrital zircons from the coal bearing Miocene succession of the Maritsa East lignite basin. We report a new finding of thin kaolinized pyroclastic beds (tonstein) in the coal bearing succession.
S. Georgiev, D. Dimitrova, Marianna Yossifova, Milena Vetseva, R. Ivanova   +4 more
semanticscholar   +1 more source

Rapid Tephra Identification in Geological Archives With Computed Tomography: Experimental Results and Natural Applications

Frontiers in Earth Science, 2021
Volcanic ash (tephra) horizons represent powerful chronological and stratigraphic markers: rapid and widespread deposition allows for correlation of geological records in time and space.
Willem G. M. van der Bilt, Willem G. M. van der Bilt, Jan Magne Cederstrøm, Eivind W. N. Støren, Eivind W. N. Støren, Sarah M. P. Berben, Sarah M. P. Berben, Sunniva Rutledal, Sunniva Rutledal   +8 more
doaj   +1 more source

Holocene carbon accumulation in the peatlands of northern Scotland [PDF]

Mires and Peat, 2018
The response of peatland carbon accumulation to climate can be complex, with internal feedbacks and processes that can dampen or amplify responses to external forcing.
J.L. Ratcliffe, R.J. Payne, T.J. Sloan, B. Smith, S. Waldron, D. Mauquoy, A. Newton, A.R. Anderson, A. Henderson, R. Andersen   +9 more
doaj   +1 more source

Last interglacial sea-level proxies in the glaciated Northern Hemisphere [PDF]

Earth System Science Data, 2022
Because global sea level during the last interglacial (LIG; 130–115 ka) was higher than today, the LIG is a useful approximate analogue for improving predictions of future sea-level rise. Here, we synthesize sea-level proxies for the LIG in the glaciated
A. S. Dalton, E. J. Gowan, E. J. Gowan, E. J. Gowan, J. Mangerud, P. Möller, J. P. Lunkka, V. Astakhov, V. Astakhov   +8 more
doaj   +1 more source

Sakurajima-Satsuma (Sz-S) and Noike-Yumugi (N-Ym) tephras: new tephrochronological marker beds for the last deglaciation, southern Kyushu, Japan [PDF]

, 2011
Two prominent tephras, Sakurajima-Satsuma (Sz-S) erupted from Sakurajima volcano and Noike-Yumugi (N-Ym) erupted from Kuchierabujima Island, provide new key marker beds for dating and synchronizing palaeoenvironmental and archaeological records in the ...
Ikehara, Minoru, Lowe, David J., Machida, Hiroshi, Moriwaki, Hiroshi, Murata, Masanori, Suzuki, Takehiko   +5 more
core   +2 more sources

Composite development and stratigraphy of the Onepoto maar lake sediment sequence (Auckland Volcanic Field, New Zealand) [PDF]

Scientific Drilling, 2021
The accurate and precise reconstruction of Quaternary climate as well as the events that punctuate it is an important driver of the study of lake sediment archives.
B. Läuchli, P. C. Augustinus, L. Peti, J. L. Hopkins   +3 more
doaj   +1 more source

Distal occurrence of mid-Holocene Whakatane Tephra on the Chatham Islands, New Zealand, and potential for cryptotephra studies [PDF]

, 2011
The Whakatane Tephra, a rhyolitic tephra erupted ca. 5500 cal. BP from Okataina Volcanic Centre, central North Island, has been identified on the Chatham Islands which lie ˜900 km east of Christchurch, New Zealand.
Hogg, Alan G., Holt, Katherine A., Lowe, David J., Wallace, R. Clel   +3 more
core   +2 more sources

A summary of terminology used in tephra-related studies [PDF]

, 2001
The word ‘tephra’, derived from a Greek word for ash, is a collective term for all the unconsolidated, primary pyroclastic products of a volcanic eruption.
Hunt, John B., Lowe, David J.
core   +3 more sources

Tephrostratigraphy and tephrochronology of lakes Ohrid and Prespa, Balkans [PDF]

Biogeosciences, 2010
Four cores from Balkans lakes Ohrid and Prespa were examined for recognition of tephra layers and cryptotephras, and the results presented along with the review of data from other two already published cores from Lake Ohrid.
R. Sulpizio, G. Zanchetta, M. D'Orazio, H. Vogel, B. Wagner   +4 more
doaj   +1 more source