SEMINARI DEL PROF. DAVID KARATSON

Il 19 maggio il Prof. Dávid Karátson terrà una serie di seminari di geomorfologia del vulcanico e di vulcanologia fisica nell’ambito del programma Erasmus plus.

Dávid Karátson è professore di geografia fisica e geomorfologia alla ELTE University di Budapest, dove è Direttore del Dipartimento di Geografia Fisica e Direttore dell'Istituto di Geografia e delle Scienze della Terra. La sua attività di ricerca include vulcanologia fisica, geomorfologia del vulcanico e stratigrafia del vulcanico dei Carpazi, Italia (Etna, Eolie), Spagna (Canarie), Grecia (Santorini), Francia (Auvergne), Ande Centrali, Giappone, SW Usa. Durante la sua carriera ha ottenuto diversi grants nazionali e internazionali (e.g. Fulbright, Humboldt) e ha partecipato a progetti internazionali in Francia, Germania, Italia e USA. Ha avuto/ha da lungo tempo collaborazioni con ricercatori italiani, sia del DST di Pisa che dell'INGV-Pisa.

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1) ore 11-13, aula GIS

The regular shape of stratovolcanoes with implications to eruptive characteristics: a DEM-based approach (PhD, MSc level)

"Strato- or composite volcanoes are the most known volcano type for the general public, basically because several of them have a surprisingly regular, apparently concave shape. However, relatively little has been done to explain this regularity. The lack of scientific information was menaioned and analysed by P. Francis in his classic textbook (1993), adding some quantitative constraints, but only in the era of DEM studies, more precisely the worldwide coverage of SRTM DEM, it was possible to better approach the problem. In my talk, on the basis of our JVGR paper (Karátson et al. 2010), I present a quantitative approach about the most symmetric stratovolcanoes of the world in relation to eruptive characteristics and geochemistry."

2) ore 14-16, aula C

Volcanic catastrophes in history - overview of famous world-shocking eruptions (BSc level)

"A "big" eruption can be classified as such in terms of magnitude, VEI (volcanic explosivity index), or simply the number of casualties. Indeed, some of the world's biggest eruptions during human history remain memorable due to the tens of thousands of people died. Although, fortunately, these lethal ones were not so numerous to make statistics, several lessons can be learned by studying them. In brief, these eruptions can be grouped into two: those causing "hot death'' and those "cold death", on the basis of the main agent, i.e. pyroclastic density currents and lahars, respectively. In my talk, I give an account of selected volcanic catastrophes including Vesuvius AD 79, Tambora, M. Pelée, N. del Ruiz, Merapi 2010, etc., in relation to plate tectonic background and eruptive behaviour."

3) (a seguire) ore 16-18, aula C

The youngest volcanic eruptions in East-Central Europe - new findings from the Ciomadul (Csomád) lava dome complex, East Carpathians, Romania

"The Carpatho-Pannonian Region has been volcanically active in the past 20 million years. Ciomadul volcano is the youngest eruptive centre, located at the southernmost end of the Intra-Carpathian Volcanic Range, and within this, the Harghita Mountains in the East Carpathians. As a result of multi-disciplinary, ongoing studies (e.g. Karátson et al. 2016), we have obtained a number of constraints on the paleo-geomorphic evolution of the volcano. Ciomadul, a lava dome complex with a twin-crater (i.e. the older Mohos peat bog and the younger St. Ana lake), produced frequent explosive eruptions between 50 and 29 ky. As a result, a set of superimposed volcanic landforms were created. The last, ca. 29 ka violent, phreatomagmatic eruption distributed tephra to as far as 350 km from vent in the Dniester delta ('Roxolany tephra')."