Michael Lindenfeld

Goethe University Frankfurt

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Georg Rümpker

Goethe University Frankfurt

Arthur Batte

Makerere University

Hagen Deckert

Fraunhofer Research Institution for Energy Infrastructures and Geothermal Systems

Fabian Limberger

Goethe University Frankfurt

A. Schumann

Makerere University

Ingo Wölbern

Goethe University Frankfurt

Herbert Wallner

Goethe University Frankfurt

Harro Schmeling

Goethe University Frankfurt

Daniel Koehn

Friedrich-Alexander-Universität Erlangen-Nürnberg

I. Woelbern

Goethe University Frankfurt

Cooperative Institutions

Goethe University Frankfurt

Johannes Gutenberg University Mainz

Makerere University

Fraunhofer Research Institution for Energy Infrastructures and Geothermal Systems

Helmholtz Centre Potsdam - GFZ German Research Centre for Geosciences

Federal Institute for Geosciences and Natural Resources

Landesamt für Umwelt, Naturschutz und Geologie

RWTH Aachen University

Büro Vatter (Switzerland)

Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung

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

Geological Society London Special Publications (2015)

Michael Gummert Michael Lindenfeld Ingo Wölbern Georg Rümpker Kasereka Celestin

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 .

10.1144/sp420.4

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Citations (11)

Active transsection faults in rift transfer zones: evidence for complex stress fields and implications for crustal fragmentation processes in the western branch of the East African Rift

International Journal of Earth Sciences (2010)

Daniel Koehn Michael Lindenfeld Georg Rümpker Kevin Aanyu Samuel H Haines

East African Rift

Fault block

Echelon formation

Clockwise

10.1007/s00531-010-0525-2

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Citations (41)

The impact of seismic noise produced by wind turbines on seismic borehole measurements

Fabian Limberger Georg Rümpker Michael Lindenfeld Hagen Deckert

Abstract. Seismic signals produced by wind turbines can have an adverse effect on seismological measurements up to distances of several kilometres. Based on numerical simulations of the emitted seismic wavefield, we study the effectivity of seismic borehole installations as a way to reduce the incoming noise. We analyse the signal amplitude as a function of sensor depth and investigate effects of seismic velocities, damping parameters and geological layerings in the subsurface. Our numerical approach is validated by real data from borehole installations affected by wind turbines. We demonstrate that a seismic borehole installation with an adequate depth can effectively reduce the impact of seismic noise from wind turbines in comparison to surface installations. Therefore, placing the seismometer at greater depth represents a potentially effective measure to improve or retain the quality of the recordings at a seismic station. However, the advantages of the borehole decrease significantly with increasing signal wavelength.

Seismometer

Seismic Noise

Vertical seismic profile

Passive seismic

SIGNAL (programming language)

10.5194/egusphere-2023-45

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Citations (0)

Depth-dependent anisotropy and rift-induced lithospheric delamination beneath the Rwenzori Mountains, East Africa

AGUFM (2009)

Georg Rümpker Michael Lindenfeld Harro Schmeling Herbert Wallner

East African Rift

Rift valley

Delamination

Source

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Fault kinematics and stress fields in the Rwenzori Mountains, Uganda

International Journal of Earth Sciences (2015)

Till Sachau Daniel Koehn D. Sarah Stamps Michael Lindenfeld

Stress field

10.1007/s00531-015-1162-6

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Citations (7)

Detection of mantle earthquakes beneath the East African Rift

Geophysical Journal International (2011)

Michael Lindenfeld Georg Rümpker

Recordings from a temporary seismic network in the Rwenzori region of the East African Rift show seven earthquakes at a depth range between 53 and 60 km. Evidence from receiver functions indicates a crustal thickness of about 32 km in this region suggesting that the earthquakes are located well within the mantle beneath the rift. The occurrence of faulting at this depth is of relevance for models of continental-rift initiation and related deep magmatic processes.

East African Rift

Rift zone

Rift valley

10.1111/j.1365-246x.2011.05048.x

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Citations (48)

Anomalous deep earthquakes beneath the East African Rift: evidence for rift induced delamination of the lithosphere?

EGU General Assembly Conference Abstracts (2010)

Michael Lindenfeld Georg Rümpker Harro Schmeling Herbert Wallner

East African Rift

Delamination

Rift zone

Source

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Citations (0)

Seismological Investigation of Rift Related Uplift: The Rwenzori Network in Western Uganda

AGU Fall Meeting Abstracts (2004)

Georg Rümpker Andrey Jakovlev Arthur Batte Michael Lindenfeld A. Schumann

Source

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Seismic energies of earthquakes and relationships to other source parameters

Tectonophysics (1995)

Michael Lindenfeld H. Berckhemer

Seismic moment

Seismic energy

Stress field

Slab

10.1016/0040-1951(94)00270-j

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Citations (7)

The impact of seismic noise produced by wind turbines on seismic borehole measurements

Solid Earth (2023)

Fabian Limberger Georg Rümpker Michael Lindenfeld Hagen Deckert

Abstract. Seismic signals produced by wind turbines can have an adverse effect on seismological measurements up to distances of several kilometres. Based on numerical simulations of the emitted seismic wave field, we study the effectivity of seismic borehole installations as a way to reduce the incoming noise. We analyse the signal amplitude as a function of sensor depth and investigate effects of seismic velocities, damping parameters and geological layering in the subsurface. Our numerical approach is validated by real data from borehole installations affected by wind turbines. We demonstrate that a seismic borehole installation with an adequate depth can effectively reduce the impact of seismic noise from wind turbines in comparison to surface installations. Therefore, placing the seismometer at greater depth represents a potentially effective measure to improve or retain the quality of the recordings at a seismic station. However, the advantages of the borehole decrease significantly with increasing signal wavelength.

Seismic Noise

Seismometer

Vertical seismic profile

Passive seismic

10.5194/se-14-859-2023

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Citations (2)