Egidio Armadillo

University of Genoa

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Co-Authors

Fausto Ferraccioli

British Antarctic Survey

E. Bozzo

University of Geneva

Tom A. Jordan

British Antarctic Survey

Daniele Rizzello

Explora (Italy)

D. A. Young

The University of Texas at Austin

Andrea Zunino

ETH Zurich

G. Caneva

University of Genoa

Alessandro Ghirotto

University of Genoa

D. D. Blankenship

The University of Texas at Austin

Claudio Pasqua

Edison (Italy)

Cooperative Institutions

University of Genoa

British Antarctic Survey

Istituto Nazionale di Geofisica e Vulcanologia

Columbia University

The University of Texas at Austin

University of Texas Institute for Geophysics

University of Leeds

National Institute of Oceanography and Applied Geophysics

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

University of Edinburgh

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Determining basal boundary conditions for assessments of East Antarctic ice sheet evolution and stability in the Wilkes Subglacial Basin

Fausto Ferraccioli Egidio Armadillo D. A. Young D Blankenship Pietro Balbi

Antarctic ice sheet

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The ARGeo geophysical model of the Tendaho geothermal field, Ethiopia

Egidio Armadillo Daniele Rizzello Jim Stimac Meseret Teklemariam Zemedkun Solomon Kebede

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New MT surveys and 3D resistivity imaging beneath the Ngozi-Rungwe volcanoes at the triple rift junction of the East African Rift System in SW Tanzania: Support for integrated interpretations of geothermal conceptual models

Geothermics (2023)

Makoye Didas Egidio Armadillo Gylfi Páll Hersir William Cumming Daniele Rizzello

The geothermal system related to the Ngozi and Rungwe volcanoes, SW Tanzania, lies at the intersection of the west and east branches of the East African Rift System and has been investigated by many geoscientists for decades. Here we present a 3D electrical resistivity model based on 190 magnetotelluric resistivity soundings that have been integrated with geochemical and geological results to support the development of the geothermal resource conceptual model presented here. The model includes two separate reservoirs, a larger system located beneath the Rungwe volcano and a smaller chloride water reservoir located under the Ngozi caldera, which contains a neutral chloride hot spring with geothermometry >230°C. An extensive conductive clay cap with variable thickness extends along the 30 km long NW-SE trending Ngozi-Rungwe Fault Zone from the Kiejo area SE of the Rungwe volcano to the Ngozi caldera. The absence of geothermal surface manifestations directly over the inferred Rungwe upflow zone is consistent with effective sealing of the proposed underlying geothermal reservoir by the clay cap. The scarcity of thermal manifestations on the up-dip margins of the low-resistivity clay cap can be explained by coincidence of the base of the clay cap with impermeable Precambrian formations and by structural boundaries. This interpretation implies that the area with the highest geothermal resource potential is the Rungwe volcano where proposed drilling sites might intersect the proposed high-temperature reservoir.

Magnetotellurics

East African Rift

Caldera

Geothermal exploration

10.1016/j.geothermics.2023.102893

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Magnetic Anomalies Caused by 2D Polygonal Structures With Uniform Arbitrary Polarization: New Insights From Analytical/Numerical Comparison Among Available Algorithm Formulations

Geophysical Research Letters (2021)

Alessandro Ghirotto Andrea Zunino Egidio Armadillo Klaus Mosegaard

Abstract Since the '60s of the last century, the calculation of the magnetic anomalies caused by 2D uniformly polarized bodies with polygonal cross‐section has been mainly performed using the popular algorithm of Talwani and Heirtzler (1962, 1964). Recently, Kravchinsky et al. (2019, https://doi.org/10.1029/2019GL082767 ) claimed errors in the above algorithm formulation, proposing new corrective formulas and questioning the effectiveness of almost 60 years of magnetic calculations. Here we show that the two approaches are equivalent and Kravchinsky et al.'s formulas simply represent an algebraic variant of those of Talwani and Heirtzler. Moreover, we analyze a large amount of random magnetic scenarios, involving both changing‐shape polygons and a realistic geological model, showing a complete agreement among the magnetic responses of the two discussed algorithms and the one proposed by Won and Bevis (1987, https://doi.org/10.1190/1.1442298 ). We release the source code of the algorithms in Julia and Python languages.

Python

Code (set theory)

10.1029/2020gl091732

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Recent aeromagnetic and deep electromagnetic exploration projects in East Antarctica

Egidio Armadillo E. Bozzo G. Caneva Fausto Ferraccioli G. Tabellario

Airborne geophysical surveys play a pivotal role in imaging subglacial geology and characterizing broad areas of the Antarctic liothsphere. Ground-based geophysics, coupled with airborne geophysics and geology, is essential to further elucidate crustal structure and tectonics. Recent Italian exploration projects have focused on three major tectonic elements over East Antarctica: i) The Transantarctic Mountains, ii) the Wilkes Subglacial Basin, and iii) the Early Palaeozoic terranes of northern Victoria Land. We review the main goals of four recent exploration projects performed between 1999-00 and the latest 2003-4 campaigns over this part of East Antarctica. Finally, we present our future collaborative effort (2005-06) aimed at providing further insight into the poorly known, yet highly controversial, Wilkes Subglacial Basin.

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Exploring under the East Antarctic Ice Sheet with new aerogeophysical surveys over the Wilkes Subglacial Basin, the Transantarctic Mountains and Dome C

Fausto Ferraccioli Tom A. Jordan Egidio Armadillo E. Bozzo Hugh F. J. Corr

As we enter the IPY geological boundary conditions for the stability of the East Antarctic Ice Sheet (EAIS) remain largely unknown. During the 2005/06 field season a major new aerogeophysical survey was performed over the Wilkes Subglacial Basin, the Transantarctic Mountains and Dome C. Over 60,000 km of new airborne radar, aeromagnetic and aerogravity data were collected. We will describe the survey layout and methodologies and present new geophysical images as a tool to address the highly contentious stability of the EAIS during warmer than present palaeoclimates, the underlying crustal structure, and to study subglacial lakes

Antarctic ice sheet

Dome (geology)

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Imaging the deep electrical conductivity structure of the Rennick Graben (North Victoria Land, Antartide)

EAEJA (2003)

Egidio Armadillo G. Tabellario E. Bozzo G. Caneva

Electrical Resistivity Tomography

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