Hekla 1947, 1845, 1510 and 1158 tephra in Finland: challenges of tracing tephra from moderate eruptions

Publisher's version (útgefin grein) Several cryptotephra layers that originate from Icelandic volcanic eruptions with a volcanic explosivity index (VEI) of ≤ 4 and tephra volumes of < 1 km3 have previously been identified in Northern Europe, albeit within a restricted geographical area. One...

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Bibliographic Details
Published in:Journal of Quaternary Science
Main Authors: Kalliokoski, Maarit, Guðmundsdóttir, Esther Ruth, Wastegård, Stefan
Other Authors: Jarðvísindastofnun (HÍ), Institute of Earth Sciences (UI), Verkfræði- og náttúruvísindasvið (HÍ), School of Engineering and Natural Sciences (UI), Háskóli Íslands, University of Iceland
Format: Article in Journal/Newspaper
Language:English
Published: Wiley 2020
Subjects:
Cryptotephra
Finnish tephrochronology
Hekla 1947
Hekla volcano
Icelandic moderate eruptions
Heklueldar
Gjóska
Faroe Islands
Hayward
Jokinen
Kalliokoski
Hekla
Iceland
sami
Online Access:https://hdl.handle.net/20.500.11815/2276
https://doi.org/10.1002/jqs.3228
Description
Summary:Publisher's version (útgefin grein) Several cryptotephra layers that originate from Icelandic volcanic eruptions with a volcanic explosivity index (VEI) of ≤ 4 and tephra volumes of < 1 km3 have previously been identified in Northern Europe, albeit within a restricted geographical area. One of these is the Hekla 1947 tephra that formed a visible fall-out in southern Finland. We searched for the Hekla 1947 tephra from peat archives within the previously inferred fall-out zone but found no evidence of its presence. Instead, we report the first identification of Hekla 1845 and Hekla 1510 cryptotephra layers outside of Iceland, the Faroe Islands, Ireland and the UK. Additionally, Hekla 1158 tephra was found in Finland for the first time. Our results confirm that Icelandic eruptions of moderate size can form cryptotephra deposits that are extensive enough to be used in inter-regional correlations of environmental archives and carry a great potential for refining regional tephrochronological frameworks. Our results also reveal that Icelandic tephra has been dispersed into Finnish airspace at least seven times during the past millennium and in addition to a direct eastward route the ash clouds can travel either via a northerly or a southerly transport pathway. We thank Sami Jokinen for assistance with field work in Finland and Dr Maria Janebo for field assistance in Iceland. Professor Siwan Davies and Dr Gwydion Jones at Swansea University are thanked for their help with micromanipulator work. We are grateful to Dr Chris Hayward for support with EPMA at the University of Edinburgh. Financial support for field work and EPMA was received from the Finnish Cultural Foundation, Varsinais-Suomi Regional Fund and Suomen Tiedeseura. Maarit Kalliokoski acknowledges funding from the Nordic Volcanological Centre at the University of Iceland and the Doctoral Programme in Biology, Geography and Geology at the University of Turku. Peer Reviewed

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