Jon Bryon
PhD Research Student

Research Profile

I am primarily interested in the deformation of continental lithopshere in extensional regimes. Studies of actively extending regions, such as the Aegean and Greece, have provided us with a detailed understanding of short term (101-104 years) processes that operate under such conditions. For example, using seismology, GPS, geomorphology and numerical modelling we now understand how normal faulting accommodates extension on different scales, how the spatial and temporal evolution of tilted blocks determines footwall uplift and erosion, and how drainage routes and sediment entry points are controlled by fault growth. We can also constrain fault kinematics and geometries.

What we know much less about is how these short term processes result in the tectonically dead basins which we can observe in the geological record. The northern North Sea is an extensional sedimentary basin where the last syn-rift phase ended approximately 140Ma. A 3D seismic data set has been aquired from industry covering the eastern side of the northern North Sea. This region is an area comparable in size to central Greece. Analysis of the late Jurassic rifting event should help us understand how the processes we can observe today in Greece produce sedimentary rift basins like the northern North Sea. Areas of particular interest are:

How does fault activity migrate with time?
In Greece it has been observed that fault activity migrates basinward with time. I am interested in knowing if this is true over longer timescales (~107 years) than those we can observe in Greece (<~104 years).

Is faulting diffuse when continents extend, or is it concentrated on narrow bands?
From Greece it is observed that the latter is true, but it is uncertain if this is the case generally and over long timescales.

Strain rate modelling
Use of a 2D inversion code will be made to model strain rate with time and space from the seismic data we have. This work will contribute to that of the group as we are interested in the variance in extension rates between basins from different tectonic settings. Modifications will also be made to the code to improve its geological realism.


University of Cambridge: 1999-
PhD Title: "Quantitative analysis of faulting and drainage: A comparison between the northern North Sea and Central Greece."
Supervisors: Nicky White, James Jackson (University of Cambridge) and Simon Price (Shell).
Supported by NERC and Shell Expro.

University of Cambridge (Queens' College) 1996-2000
BA/MSci Geological Sciences
MSci research project title: "Seismicity of the Japan Trench and its associated subduction zone."