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Department of Earth Sciences

 
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A collection of all the seminars going on at the Department, either on the downtown site, or out at the Bullard Laboratories
Updated: 37 min 6 sec ago

Thu 17 Jun 13:00: Storms, surf, & swells: Bedrock breakdown and the geodynamic demise of volcanic ocean islands

Wed, 19/05/2021 - 10:14
Storms, surf, & swells: Bedrock breakdown and the geodynamic demise of volcanic ocean islands

With homogeneous bedrock, dramatic climate gradients, and remnant surfaces that constrain their age, initial topography, and vertical motions relative to sea level, volcanic ocean islands provide an exceptional natural experiment in landscape evolution. Analyses traversing gradients in island climate and bedrock age have the potential to advance our understanding of climatic and tectonic influences on landscape evolution in a diverse range of continental settings. Yet, as net subsiding and boundary-dominated landmasses, islands are in some ways dissimilar to most continental landscapes, and the mechanisms of island vertical motion remain largely enigmatic. Island uplift and subsidence can provide important observational constraints on the rheology and dynamics of the Earth’s interior, in addition to setting the boundary conditions for the topographic, climatic, and biogeographic evolution of island landscapes. In this talk, I exploit steep climate gradients in the Hawaiian Islands to quantify controls on fluvial and coastal erosion, and I assess the contribution of lithosphere and mantle processes to surface deformation at ocean hotspots. Through physically-based modeling, analysis of topo-bathymetric and geochronologic data, and field measurements, I examine (1) the control of rainfall variability on long-term rates of bedrock river incision on the Hawaiian Island of Kaua’i, (2) the influence of wave power on bedrock coastal erosion in the Hawaiian Islands, and (3) the mechanisms that cause volcanic ocean islands to drown below sea level to form atolls and guyots. These analyses provide empirical support for hypothesized feedbacks between climate, tectonics, and topography, linking the evolution of the solid earth, hydrosphere, and biosphere.

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Wed 19 May 16:00: Precision Seismology: From Source to Plate Boundary Scales

Tue, 18/05/2021 - 08:08
Precision Seismology: From Source to Plate Boundary Scales

Abstract not available

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Mon 17 May 15:00: The Green Transition in Natural Resources

Fri, 30/04/2021 - 09:13
The Green Transition in Natural Resources

Over the past century global demand for natural resources has led to unsustainable, socially-unjust and environmentally-disastrous practices of resource extraction. Now in the depths of a climate and ecological crisis, we are faced with the necessity of transitioning from a hydrocarbon-fuelled, mining-intensive society into something altogether more sustainable within the next decade. This panel discussion brings together experts from outside of the geosciences, with the aim of exploring the ramifications of a ‘green transition’ for natural resource extraction. We will discuss questions such as: can extraction ever be sustainable, to what extent are technological developments key to sustainable extraction, and how can new ways of extracting and using natural resources promote social and environmental justice?

  • Speaker: Panel discussion: Pippa Howard (Flora and Fuana International) and Andy Whitmore (London Mining Network)
  • Monday 17 May 2021, 15:00-16:00
  • Venue: Zoom.
  • Series: Geoscience in Context; organiser: Oliver Shorttle.

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Fri 21 May 16:00: Seismic Structure of Borneo and Sulawesi

Tue, 27/04/2021 - 11:04
Seismic Structure of Borneo and Sulawesi

Abstract not available

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Wed 05 May 16:00: Habitability in the Solar System

Mon, 26/04/2021 - 13:55
Habitability in the Solar System

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Fri 18 Jun 16:00: Title to be confirmed

Mon, 26/04/2021 - 11:08
Title to be confirmed

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Fri 11 Jun 16:00: Title to be confirmed

Mon, 26/04/2021 - 11:07
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Fri 28 May 16:00: Title to be confirmed

Mon, 26/04/2021 - 11:05
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Fri 21 May 16:00: Title to be confirmed

Mon, 26/04/2021 - 11:04
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Fri 14 May 16:00: Title to be confirmed

Mon, 26/04/2021 - 11:04
Title to be confirmed

Abstract not available

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