PhD Studentship in Earth and Ocean Sciences, Cardiff University, UK

PhD in Earth and Ocean Sciences: The geology of ‘deep’ slow slip and tremor: Instability in the viscous regime?

Cardiff University Cathays Park Campus UK

To unlock the enigmatic physical processes behind a recently discovered spectrum of slow earthquake phenomena, where faults slip at speeds intermediate between steady creep and earthquakes, the ERC Project ‘MICA’ aims to define testable hypotheses based on geological observations in active and ancient fault zones, and test these inferences in numerical models with realistic lab-defined stress-strength relationships. The potential outcome is to understand the physical mechanism(s) of slow earthquakes, and thus bridge the knowledge gap in understanding what controls the speed at which faults slip.

Traditionally, major tectonic faults were thought to accommodate displacement by either slow, continuous creep, or episodic, potentially damaging earthquakes. This old paradigm of two end-member fault behaviours is now replaced by a new notion that fault slip velocities span a continuum from millimetres per year to metres per second (Peng and Gomberg, 2010). The greatest range of slip behaviours is observed at the edges of the geodetically locked zone in subduction megathrusts, in episodic slow slip and tremor events. This PhD project aims to explore structures in ancient megathrust faults exhumed from depths where active slow slip and tremor occurs.

The reason for the field-based approach is: (1) the geological record includes a range of structures formed by a mixture of continuous and discontinuous deformation processes, analogous to the seismic-aseismic transitional properties assumed for slow earthquakes; (2) tabular fault zones with mixed rheological properties contain a rich variety of deformation structures, likely arising from a rich variety of geophysically observed fault slip styles; and (3) brittle and ductile structures are intimately interconnected, and have cross-cutting relationships implying that either can trigger the other, consistent with interplay between coincident seismic and aseismic shear displacement.

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ACERGY Ocean Engineering Scholarship, Australia

ACERGY are in Western Australia, and are a seabed-to-surface engineering and construction contractor to the offshore oil and gas industry worldwide. They provide integrated services, and plan, design and deliver complex projects in harsh and challenging environments.

ACERGY will offer a competitive Scholarship in 2012 that will include a work placement (November 2011 – February 2012). The scholarship is aimed at potential Bachelor of Engineering (Ocean Engineering) degree students that will commence their fourth year in 2012.

Applicants should have demonstrated excellence in the third year of study, show leadership potential, and will also be subject to an interview process with AMC and ACERGY panel, as part of this scholarship award, successful candidates would undertake a work placement between (November 2011 – February 2012) with ACERGY.

The scholarship will provide a stipend of up to $15,000
(The recipient will receive $10,000 during the academic year March to December, and the rate per work day over the summer placement will be $100 per day approx 10 weeks)

The ACERGY Scholarship is offered to one 3rd year AMC student undertaking Bachelor of Engineering (Ocean Engineering)

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Postdoctoral Fellowships, Atmosphere Ocean Modelling Data Assimilation, Dalhousie University, Canada

Dalhousie University is searching for Postdoctoral Fellows and/or Research Associates to join the Global Ocean-Atmosphere Prediction and Predictability (GOAPP) network funded by the Canadian Foundation for Climate and Atmospheric Sciences. Two positions are available. The successful candidates will collaborate with researchers at Dalhousie University and other universities in the network, and with scientists from Environment Canada and Fisheries and Oceans Canada. They will have a Ph.D. in Atmospheric Science, Physical Oceanography or a related discipline. They will also have experience in running and developing state-of-the-art ocean and/or atmosphere models or expertise in data analysis required for model-data intercomparisons. Knowledge of data assimilation is desirable.

GOAPP’s overall goal is to improve forecasts of the ocean and atmosphere on time-scales of days to decades, and space scales of tens of km (e.g., ocean eddies) to global. The successful applicants will focus on time-scales of days to seasons. The research involves the assimilation of a wide range of data types, including relatively new data streams such as temperature and salinity profiles from Argo floats, into ocean and coupled models using novel assimilation schemes.

Specific research activities include: enhancing ocean and coupled atmosphere-ocean modeling and data assimilation capabilities; identifying the sources of, and limits to, predictability in the ocean and coupled system; and undertaking and physically interpreting decadal scale reanalyses.

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