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Book Chapter

Crustal structure and high-resolution Moho topography across the Rwenzori region (Albertine rift) from P-receiver functions

By
Michael Gummert
Michael Gummert
1
Institut für Geowissenschaften, Goethe-Universität Frankfurt, Frankfurt, Germany
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Michael Lindenfeld
Michael Lindenfeld
1
Institut für Geowissenschaften, Goethe-Universität Frankfurt, Frankfurt, Germany
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Ingo Wölbern
Ingo Wölbern
1
Institut für Geowissenschaften, Goethe-Universität Frankfurt, Frankfurt, Germany
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Georg Rümpker
Georg Rümpker
1
Institut für Geowissenschaften, Goethe-Universität Frankfurt, Frankfurt, Germany
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Kasereka Celestin
Kasereka Celestin
2
Goma Volcano Observatory, Goma, Democratic Republic of Congo
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Arthur Batte
Arthur Batte
3
Department of Geology, Makerere University, Kampala, Uganda
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Published:
January 01, 2016

Abstract

The Rwenzori region, which is located between the Democratic Republic of Congo and Uganda, is part of the western branch of the East African Rift. With elevations of c. 5000 m a.s.l., the Rwenzori Mountains are situated between the Albert Rift and the Edward Rift segments and cover an area of approximately 120 km by 50 km. In this study we investigate the Moho topography beneath the Rwenzori region based on data from a network of 33 broadband seismic stations that were operated from September 2009 until August 2011. Variations of crustal thickness are obtained from the H-κ stacking method applied to P-receiver functions. We discuss the effect of low velocity layers within the crust on the determined Moho depths, which range from 20 km up to 39 km. The lack of a crustal root beneath the Rwenzori Mountains and its location in an extensional setting are contrary to the orogenesis generated by collisions of tectonic units. Our results indicate crustal thinning and provide evidence for the alternative mechanism of crustal bending, triggered by the tensile stress and the elasticity of the crust.

Supplementary material:

Examples and methods for identifying crustal structures and sediment layers are available at http://www.geolsoc.org.uk/SUP18801.

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Contents

Geological Society, London, Special Publications

Magmatic Rifting and Active Volcanism

T. J. Wright
T. J. Wright
University of Leeds, UK
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A. Ayele
A. Ayele
Addis Ababa University, Ethiopia
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D. J. Ferguson
D. J. Ferguson
University of Leeds, UK
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T. Kidane
T. Kidane
Addis Ababa University, Ethiopia
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C. Vye-Brown
C. Vye-Brown
British Geological Survey, UK
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Geological Society of London
Volume
420
ISBN electronic:
9781862391345
Publication date:
January 01, 2016

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