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2018 Geological Survey of Canada (GSC) Atlantic Science Hour

Who: Vittorio Maselli

School of Geosciences
University of Aberdeen

What: Anthropic impacts on coastal systems, submarine geohazards and continental margins evolution

This talk is aimed to present a brief overview of my experience in three particular research subjects and its potential application to the study of the Eastern Canada margin, in the light of my future position at the Department of Earth Sciences at Dalhousie University.

In the first part, I concentrate on coastal environments, probably the most complex, fragile and densely populated landscapes on Earth. Focusing on the largest southern European deltas, I will show how enhanced, and unaware, anthropic pressures on the landscape controlled their formation and retreat during the last few thousands of years. In the second part, I will outline research results associated with the study of marine geohazards, in particular tsunamis and landslides. I will present the results of a series of field campaigns along the coastline of Tanzania and the discovery of a 1000-yr old event that appears to have devastated a Swahili settlement. Tsunamis can be generated by earthquakes or by large submarine landslides, and it is often difficult to disentangle the role of different processes in promoting continental margin instability. Here, I will show how sediment supply, halokinesis and deep ocean circulation promoted margin instability along the Sigsbee Escarpment in the deep water Gulf of Mexico during the Late Quaternary. Continental margins form and evolve in response to allogenic and autogenic processes. The East Africa margin is one of the few places in the world where it is possible to observe the effect of continental rifting on the evolution of both continental and marine landscapes. In this last section of the talk, I will show how the East African Rift System (EARS) led to a physiographic change of the western Somali basin, promoting a reorganization of the deepwater drainage system and a shift in ocean bottom circulation.

When: 10:30 am, Wednesday, September 12, 2018

Where: AGC Boardroom, 5th Floor Murray, Bedford Institute of Oceanography, Dartmouth, Nova Scotia

Who: Valentina Yanko

Head of the Department of Physical and Marine Geology
Head of the Laboratory of Marine Geology and Geochemistry
Head of the Scientific and Educational Center of Geoarchaeology
Marine and Environmental Geology (SECGMEG)
Odessa I. I. Mechnikov National University, Ukraine

What: Degassing of the Black Sea Bottom under global climate change: significance for environment, geological exploration and navigation

The Black Sea basin contains great resources of methane gas stored in form of gas hydrates beneath sea floor, the amount of which is believed higher than in any other known gas reservoir on Earth. Gas related features e.g. submarine volcanoes, gas seeps, and gas bogs release methane to water column. The project is focussed on mapping these features on the Black Sea shelf and slope and on understanding energy resources and related geohazards in the world's largest (428,000 km2) meromictic basin. This research is relevant to energy policy makers and coastal managers who deal with environmental hazards and sustainable development in the region under the Global Climate Change. The presentation will address the current knowledge of the methane resources and seep-related features in the Black Sea, and discuss approaches, significance and benefits of the research into methane degassing.

When: 10:30 am, Wednesday, August 1, 2018

Where: AGC Boardroom, 5th Floor Murray, Bedford Institute of Oceanography, Dartmouth, Nova Scotia

Last Modified: 2018-09-06