A5004156976- earthquake and tectonic studies
- High-pressure geophysics and materials
- Seismic Imaging and Inversion Techniques
- Geological and Geochemical Analysis
- Seismic Waves and Analysis
- Geological and Geophysical Studies
- Geological formations and processes
- Earthquake Detection and Analysis
- Seismology and Earthquake Studies
- Geophysics and Gravity Measurements
- Geotechnical and Geomechanical Engineering
- Geophysics and Sensor Technology
- Geophysical and Geoelectrical Methods
- Geological and Tectonic Studies in Latin America
- Geological Modeling and Analysis
- Geological Studies and Exploration
Tulane University
2017-2022
University of Southampton
2014-2021
National Oceanography Centre
2014-2019
University of Florence
2017
University of Bristol
2012-2017
Birkbeck, University of London
2017
Addis Ababa University
2017
Abstract Unusually deep earthquakes occur beneath rift segments with and without surface expressions of magmatism in the East African Rift system. The Tanganyika is part Western has no evidence magmatism. TANG14 array was deployed southern rift, where magnitude up to 7.4 have occurred, probe crust upper mantle structure evaluate fault kinematics. Four hundred seventy‐four detected between June 2014 September 2015 are located using a new regional velocity model. precise locations, magnitudes,...
Abstract Although the deep, wide basins of Western rift, Africa, have served as analogues for evolution half‐graben basins, geometry and kinematics border, intrabasinal, transfer fault systems been weakly constrained. Despite >100‐km‐long bounding little was known seismicity patterns or potential M > 7.5 earthquakes. Using our new local earthquake database from 2013‐2015 Study Extension maGmatism in Malawi aNd Tanzania (SEGMeNT) seismic array (57 onshore, 32 lake‐bottom stations)...
The Cameroon Volcanic Line (CVL) in West Africa is a chain of Cenozoic volcanism with no clear age progression. reasons for its existence are unclear, and the nature magmatic plumbing system poorly understood. Specifically, whether or not CVL crust presently contains melt and/or mafic intrusions, as often observed at hot spots rifts elsewhere, unknown. To address this issue, we present receiver function study crustal structure using earthquakes recorded by Broadband Seismic Experiment. In...
Abstract The Cameroon Volcanic Line (CVL) straddles the continent‐ocean boundary in West Africa but exhibits no clear age progression. This renders it difficult to explain by traditional plume/plate motion hypotheses; thus, there remains consensus on processes responsible for its development. To understand better nature of asthenospheric flow beneath CVL, and effects hotspot tectonism overlying lithosphere, we analyze mantle seismic anisotropy seismicity. is relatively aseismic compared...
Abstract Melting of the mantle during continental breakup leads to magmatic intrusion and volcanism, yet our understanding location dominant mechanisms melt generation in rifting environments is impeded by a paucity direct observations melting. It unclear when process segmented nature magma supply typical seafloor spreading initiates. Here, we use Rayleigh-wave tomography construct high-resolution absolute three-dimensional shear-wave velocity model upper 250 km beneath Afar triple junction,...
Located at the southernmost sector of Western Branch East African Rift System, Malawi exemplifies an active, magma-poor, weakly extended continental rift. To investigate controls on rifting, we image crustal and uppermost mantle structure beneath region using ambient-noise teleseismic Rayleigh-wave phase velocities between 9 100 s period. Our study includes six lake-bottom seismometers located in Lake (Nyasa), first time have been deployed any rift lakes. Noise levels lake are lower than...
Abstract The southern Tanganyika Rift, within the Western rift, Africa, has earthquakes to depths of 37 km, yet few constraints exist on crustal thickness, or early stage rifting processes in apparently amagmatic rift sectors. aim TANGA14 experiment was constrain bulk properties test whether magmatic modify lithosphere areas deep seismicity, and degree lithospheric thinning. We use 11 broadband seismometers implement receiver function analysis using H ‐ κ stacking, a method sensitive...
Uncertainty in reported body-wave arrival times is a key contributor to earthquakes location error estimates,especially the early-instrumental period (e.g., prior early 1960s). As such, reliable assessment of observa-tional errors an important element earthquake problem. Standard locationprocedures at International Seismological Centre assume seismic time picking defined for most recentdecades instrumental seismology (i.e., from However, measurements currently used fail cap-ture uncertainty...
The Danakil region of northern Afar is an area ongoing seismic and volcanic activity caused by the final stages continental breakup.To improve quantification seismicity, we developed a calibrated local earthquake magnitude scale.The accurate calculation magnitudes allows estimation b-values maximum magnitudes, both which are essential for seismic-hazard analysis.Earthquake data collected between February 2011 2013 on 11 three-component broadband seismometers were analyzed.A total 4275...
SUMMARY Understanding the dynamics and evolution of continental rifting is broadly important for our understanding plate tectonics. The northern East African Rift offers an excellent opportunity to study these processes at active rift that was initiated by a large magmatic event. Multiple seismic models have been produced understand magmatism which image punctuated slow velocity zones in asthenosphere. However, depth extent bodies has less well constrained leading much debate regarding...
The International Seismological Centre (ISC) combines seismic observations from ~150 agencies in ~100 counties to produce the definitive global earthquake catalogue by combining phase arrivals. As well as data, hypocentres and magnitudes ISC Bulletin includes other parameters such moment tensors that are reported many agencies. This data is freely accessible, searchable downloadable through website (www.isc.ac.uk/iscbulletin). Earthquake Toolbox for MATLAB provides access this parametric via...
Abstract Although the East African rift system formed in cratonic lithosphere above a large‐scale mantle upwelling, some sectors have voluminous magmatism, while others isolated, small‐volume eruptive centers. We conduct teleseismic shear wave splitting analyses on data from 5 lake‐bottom seismometers and 67 land stations Tanganyika‐Rukwa‐Malawi zone, including Rungwe Volcanic Province (RVP), Kivu Virunga Province, to evaluate rift‐perpendicular strain, rift‐parallel melt intrusion, regional...
Understanding the dynamics and evolution of continental rifting is broadly important for our understanding plate tectonics. The northern East African Rift offers an excellent opportunity to study these processes at active rift that was initiated by a large magmatic event. Multiple seismic models have been produced understand magmatism which image punctuated slow velocity zones in asthenosphere. However, depth extent bodies has less well constrained leading much debate regarding primary...