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DLES

Distinguished Lectures in Earth Sciences - 2019

        
 
Paraskevi Nomikou  (Department of Geology and Geoenvironment, National and Kapodistrian University of Athens): “Geohazards along Christiana-Santorini-Kolumbo rift (Greece)”. 16 Maggio. (PDF della DLES)   
 
Short biosketch
Ondra Sracek, professor of hydrogeology and environmental geochemistry
Dipl. Eng.- Technical University of Mining, Ostrava, Czech Republic
M.Sc.-University of Waterloo, Waterloo, Canada
Ph.D.-Universite Laval, Quebec, Canada
Worked and lectured in: Canada, Mexico, Argentina, Bolivia, Brazil, Zambia, Namibia, Bangladesh, India, Taiwan etc.
Principal interests: environmental arsenic, mine drainage, geochemical and reactive transport modeling, natural attenuation of contaminants
 
Short synopsis of seminar
There are extensive mining and ore treatment activities in the Zambian Copperbelt. Principal contaminants are Cu and Cu and, due to generally neutral mine drainage, a large portion of contamination is transported in suspension. Secondary hematite in mine tailings incorporates contaminants, which are relatively immobile. Contaminants can be mobilized in rainy season, when discharge in local streams increases by several orders of magnitude.
 
Short bio:
Valentina Socco is Associate Professor in Geophysics at the Department of Engineering of Environment, Land and Infrastructures of the Politecnico di Torino, where she took her civil engineering MSc in 1992 and her PhD in Environmental Geo-engineering in 1996. Dr Socco has been principal investigator of 15 research projects financed by national and international institutions and companies and since 2007 she has been in charge of the Applied Geophysics Lab of DIATI.
In 2014 Dr Socco has received the Conrad Schlumberger Award (EAGE) and in 2013 she has been chosen as Honorary Lecturer by the SEG. Dr Socco is Editor in Chief of Geophysics since 2017.
Dr Socco works on developing geophysical techniques for near surface investigation for seismic hazard and engineering, hydrocarbon exploration, environment and cultural heritage. In the last fifteen years, she has focused her research work on seismic surface waves and geophysical data integration techniques.  She is author of more than 110 scientific publications in peer reviewed journals and conferences. She has been awarded with an honourable mention in the category best paper in Geophysics in 2012, 2013 and 2016. She has been member of Research Committee and Education Committee of EAGE and DL Committee of SEG and she has been vice-chairperson and chair-person of the Near Surface Division Committee of EAGE and member of EAGE Board (2014-16). She has been Associate Editor (2003-2013) Assistant Editor (2013-2017) of Geophysics and she has been Associate Editor (2006-2013) of Near Surface Geophysics.  She has been Convener of several international workshops. She has been Guest Editor of two special issues of Near Surface Geophysics, published in 2004 and 2011, respectively.
Dr Socco is Professor of the course “Exploration Geophysics” in the MSc program in Petroleum Engineering at Politecnico di Torino. She has been advisor of 7 post-Docs, 8 PhD students and of more than 50 MSc students. She has been invited lecturer at more than 40 academic institutions and international conferences.
 
Surface wave analysis for P-and S-wave velocity models
Seismic surface wave analysis has had a tremendous increase of attention by the scientific community in the last decade. It is nowadays the most widely applied technique for the estimation of S-wave velocity models in various fields of application ranging from seismic hazard and engineering studies to hydrocarbon exploration. Surface wave analysis are mainly used for estimation of S-wave velocity models because their propagation is more sensitive to shear properties than to compressional properties of the material. Nevertheless, recently a method based on the concept of surface wave skin-depth and its dependence to Poisson’s ration has been proposed to use surface wave records to estimate also P-wave velocity models widening the possible range of applications of this surve

Estimation of selected global effects influence on the evaluation of Bouguer anomaly in gravimetry

Roman Pašteka(Department of Applied and Environmental Geophysics, Comenius University, Bratislava)

 
Evaluation of the Bouguer anomalies (BA) is a fundamental tool in gravimetry in the area of data processing and interpretation. Very interesting is also the historical development of BA definition. Beside of this, there still exist a variety of open questions, which are connected with the definition and parametrization of BA evaluation: Why 166. 7 km? What is the influence of topography and bathymetry behind this standard distance? What is the role of crustal and upper mantle structures in the possible compensation of these distant effects? What is exactly the gravity normal field, which we are evaluating in the standard approach of BA evaluation? Could we not calculate it in some more "geophysical" way? How important is the so called geophysical indirect effect? And should be calculate BA only for ellipsoidal heights? What are the influences of next ignored large volumes of masses, like the atmosphere, ice,...
Proposed presentation will try to give some answers to these depicted questions...
 
 
Roman Paštekareceived a Ph.D. in applied geophysics (1996) from the Comenius University (Bratislava) and since that year he has been working there as a university lecturer. Since 2011 he is the head of the Department of Applied and Environmental Geophysics. From 2003 until 2011 he was also an external lecturer at the Institute of Meteorology and Geophysics, Vienna University (Austria) and in years 2009-2010 he was a visiting professor at the Institute of Geosciences at the Christian-Albrechts University in Kiel (Germany). His professional work is focused on the methodology of potential-field data processing and interpretation. He is a member of the editorial board of the journal Geophysical Prospecting, where he has the position of associate editor for gravimetry. He is a member of EAGE and SEG associations.