
Fenitra AndriampenomananaUniversity of the Witwatersrand | wits · School of Geosciences
Fenitra Andriampenomanana
PhD
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10
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Introduction
I am a Postdoctoral Fellow at the School of Geosciences - University of the Witwatersrand, Johannesburg, South Africa. My main research interests are in the field of structural seismology, in eastern and southern Africa, using receiver function analysis, seismic tomography, seismic anisotropy...
Publications
Publications (10)
The lithosphere ofMadagascar was initially amalgamated during the Pan-African events in the Neoproterozoic. It has subsequently been reshaped by extensional processes associated with the separation from Africa and India in the Jurassic and Cretaceous, respectively, and been subjected to several magmatic events in the late Cretaceous and the Cenozoi...
The lithosphere of Madagascar records a long series of tectonic processes. Structures initially inherited from the Pan-African Orogeny are overprinted by a series of extensional tectonic and magmatic events that began with the breakup of Gondwana and continued through to the present. Here, we present a Pn-tomography study in which Pn travel times a...
Several interpretations of shear-wave splitting measurements in East Africa have been proposed, but a comprehensive understanding of seismic anisotropy is lacking vis-à-vis geodynamic processes affecting the African plate, in part because of geographically limited data coverage. Here, we report new shear wave splitting observations using PKS, SKS,...
We report new PKS, SKS, and SKKS splitting measurements for 88 seismic stations in Namibia, Botswana, South Africa, and Mozambique. When combined with measurements from previous studies, the ensemble of measurements shows a fairly uniform NNE to NE (∼41° on average) fast‐polarization direction (ϕ) and delay time (δt) (∼0.7 s on average) across the...
We present here the first experimental science (consensus)-based mineral prospectivity mapping (MPM) method and its validation results in the form of national prospectivity maps and datasets for PGE–Ni–Cu–Cr and Witwatersrand-type Au deposits in South Africa. The research objectives were: (1) to develop the method toward applicative uses; (2) to th...
Several dozen stones of an ordinary chondrite meteorite fell in and around the town of Benenitra in southwestern Madagascar during the early evening of 27 July 2018, minutes after a widely observed meteor fireball (bolide) transit and detonation. The event was confirmed by low-frequency infrasound recordings received at ~17h15 UTC (Coordinated Univ...
The seismicity and seismotectonics of Madagascar have been studied using an island-wide distribution of broadband seismic stations. The 28-station MAdagascar-COmoros-MOzambique (MACOMO) array was deployed for a 23-month period between 2011 and 2013. MACOMO data were supplemented by seven temporary stations from the Seismological Signatures in the L...
Shear wave fast polarization directions (Φ) and delay times (dt) obtained from SKS and SKKS splitting measurements are reported for 25 temporary and 2 permanent seismic stations distributed throughout Madagascar. Results show a complicated pattern of Φ that is not easily explained by a single source of anisotropy, such as fossil anisotropy in the l...