NDLI: Identifying multiple eruption phases from a compound tephra blanket: an example of the AD1256 Al-Madinah eruption, Saudi Arabia

Content Provider	Springer Nature Link
Author	Kawabata, E. Cronin, S. J. Bebbington, M. S. Moufti, M. R. H. El Masry, N. Wang, T.
Copyright Year	2015
Abstract	Complex eruption episodes commonly produce several phases of tephra fall and/or concurrent falls from multiple vents. Phases of eruption are challenging to reconstruct from the geological record, especially where there is a lack of distinct physical or chemical variations during an eruption episode. A statistical method is proposed for identifying the most likely combination of multiple fall lobes for composite tephra deposits, using a new high-resolution tephra fall map from the basaltic AD1256 Harrat Al-Madinah fissure eruption in Saudi Arabia. This dominantly effusive eruption episode lasted 52 days periodically producing tephra from several vents along the fissure. Most tephra was produced from high Hawaiian fountains and dispersed under differing wind conditions. The widest-dispersed tephra occurred under phases of the highest fountains, at least 500 m high and probably closer to 1000 m. These high fountains produced pyroclasts with a broad range of vesicularity. Similar total versus lobe-specific grain size determinations showed little systematic variation of maximum fountain-height phases. Individual tephra lobe properties (vesicle form, density, particle shape and particle-size distribution) in different sectors around the volcano varied only subtly. From the statistical distribution of spot fall-thickness measurements, a semi-empirical tephra fallout model, modified to account for weathering, wind remobilisation and settling, was fitted using maximum likelihood estimation. A range of likely eruption-event scenarios were evaluated, concluding that the AD1256 eruption most likely comprised three separate fall-producing eruptions from its northern vent under differing wind conditions. The first of these occurred concurrently with high-fountaining events from two other major vents southward along the fissure, producing overlapping fall lobes. Applying this method to other similar compound tephra deposits will help elucidate more realistic eruption scenarios and event reconstructions from the geological record.
Starting Page	1
Ending Page	13
Page Count	13
File Format	PDF
ISSN	02588900
Journal	Bulletin of Volcanology
Volume Number	77
Issue Number	1
e-ISSN	14320819
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2015-01-23
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Tephra Grain size distribution Statistical method Volume estimation Geology Geophysics/Geodesy Mineralogy Sedimentology
Content Type	Text
Resource Type	Article
Subject	Geochemistry and Petrology

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Erratum to: Identifying multiple eruption phases from a compound tephra blanket: an example of the AD1256 Al-Madinah eruption, Saudi Arabia

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