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A multidisciplinary study of the final episode of the Manda Hararo dyke sequence, Ethiopia, and implications for trends in volcanism during the rifting cycle

A multidisciplinary study of the final episode of the Manda Hararo dyke sequence, Ethiopia, and implications for trends in volcanism during the rifting cycle
A multidisciplinary study of the final episode of the Manda Hararo dyke sequence, Ethiopia, and implications for trends in volcanism during the rifting cycle
The sequence of dyke intrusions between 2005 and 2010 in the Manda Hararo rift segment, Ethiopia, provided an opportunity to test conceptual models of continental rifting. Based on trends up to dyke 13 in the sequence, it was anticipated that, should magma supply continue, dykes would shorten in length and eruptions would increase in size and decrease in distance from the segment centre as extensional stress was progressively released. In this paper we revisit these predictions by presenting a comprehensive overview of the May 2010 dyke and fissure eruption, the 14th and last in the sequence, from InSAR, seismicity, satellite thermal data, ultraviolet SO2 retrievals and multiple LiDAR surveys. We find the dyke is longer than other eruptive dykes in the sequence, propagating in two directions from the segment centre, but otherwise fairly typical in terms of opening, propagation speed and geodetic and seismic moment. However, though the eruption is located closer to the segment centre, it is much smaller than previous events. We interpret this as indicating that either the Manda Hararo rifting event was magma limited, or that extensional stress varies north and south of the segment centre.
0305-8719
149-163
Barnie, T.D.
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Keir, D.
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Hamling, I.
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Hofmann, B.
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Belachew, M.
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Carn, S.
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Eastwell, D.
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Hammond, J.O.S.
df081c77-2e69-4753-8846-549826d905bb
Ayele, A.
2a0d90e9-a4be-4484-9301-5c4df46f9407
Oppenheimer, C.
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Wright, T.
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Wright, T.J.
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Ayele, A.
2a0d90e9-a4be-4484-9301-5c4df46f9407
Ferguson, D.J.
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Kidane, T.
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Vye-Brown, C.
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Barnie, T.D.
8c8fa7a1-5102-48a4-8197-d8a2013cff9e
Keir, D.
5616f81f-bf1b-4678-a167-3160b5647c65
Hamling, I.
98e220af-973f-49d4-a8ec-31746c52c7fa
Hofmann, B.
105f9542-60dd-4bcf-91b4-9ebe9cd7f0d1
Belachew, M.
3a0232fd-0c1b-49ad-82a8-9e5aaf1e3cfa
Carn, S.
aba7a639-d7b8-43d0-b36b-19d55b56cba2
Eastwell, D.
32afb98d-8f07-4eb7-abd1-349b1470cd51
Hammond, J.O.S.
df081c77-2e69-4753-8846-549826d905bb
Ayele, A.
2a0d90e9-a4be-4484-9301-5c4df46f9407
Oppenheimer, C.
2639e0bb-9076-4b00-9015-df912a01ecd6
Wright, T.
7a5fc3bc-74e5-4712-a69d-8b153b8606ec
Wright, T.J.
aeda4400-2cf2-4875-aade-b1c53f4f4fb7
Ayele, A.
2a0d90e9-a4be-4484-9301-5c4df46f9407
Ferguson, D.J.
495bbc35-0cb0-46f7-8402-d59eaccaa245
Kidane, T.
859acfce-b312-47c5-aeef-8ceef1bd66de
Vye-Brown, C.
ca7834e4-210a-4a63-adb7-d242e426dca7

Barnie, T.D., Keir, D., Hamling, I., Hofmann, B., Belachew, M., Carn, S., Eastwell, D., Hammond, J.O.S., Ayele, A., Oppenheimer, C. and Wright, T. , Wright, T.J., Ayele, A., Ferguson, D.J., Kidane, T. and Vye-Brown, C. (eds.) (2016) A multidisciplinary study of the final episode of the Manda Hararo dyke sequence, Ethiopia, and implications for trends in volcanism during the rifting cycle. Geological Society London Special Publications, 420, 149-163. (doi:10.1144/SP420.6).

Record type: Article

Abstract

The sequence of dyke intrusions between 2005 and 2010 in the Manda Hararo rift segment, Ethiopia, provided an opportunity to test conceptual models of continental rifting. Based on trends up to dyke 13 in the sequence, it was anticipated that, should magma supply continue, dykes would shorten in length and eruptions would increase in size and decrease in distance from the segment centre as extensional stress was progressively released. In this paper we revisit these predictions by presenting a comprehensive overview of the May 2010 dyke and fissure eruption, the 14th and last in the sequence, from InSAR, seismicity, satellite thermal data, ultraviolet SO2 retrievals and multiple LiDAR surveys. We find the dyke is longer than other eruptive dykes in the sequence, propagating in two directions from the segment centre, but otherwise fairly typical in terms of opening, propagation speed and geodetic and seismic moment. However, though the eruption is located closer to the segment centre, it is much smaller than previous events. We interpret this as indicating that either the Manda Hararo rifting event was magma limited, or that extensional stress varies north and south of the segment centre.

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e-pub ahead of print date: 15 May 2015
Published date: 2016
Organisations: Geology & Geophysics

Identifiers

Local EPrints ID: 377219
URI: https://eprints.soton.ac.uk/id/eprint/377219
ISSN: 0305-8719
PURE UUID: 49bb36da-4998-42a6-9596-659ce1f02af6
ORCID for D. Keir: ORCID iD orcid.org/0000-0001-8787-8446

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Date deposited: 19 May 2015 08:42
Last modified: 06 Jun 2018 12:31

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Contributors

Author: T.D. Barnie
Author: D. Keir ORCID iD
Author: I. Hamling
Author: B. Hofmann
Author: M. Belachew
Author: S. Carn
Author: D. Eastwell
Author: J.O.S. Hammond
Author: A. Ayele
Author: C. Oppenheimer
Author: T. Wright
Editor: T.J. Wright
Editor: A. Ayele
Editor: D.J. Ferguson
Editor: T. Kidane
Editor: C. Vye-Brown

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