Résumé

Work history

2002 - Present: Research Scientist, NORSAR, Norway 2000 - 2002: Research fellow, University of Leeds, UK and Institutt for geologi, University of Oslo, Norway. 1998 - 2000: Research fellow, University of Exeter, UK.

Work summary

Dr Gibbons completed his Ph.D. in September 1998 on the subject of numerical geodynamo modelling, with two primary focus areas. The first was reversal mechanisms and how small changes in the large-scale patterns of fluid flow in the Earth's core can excite different modes of magnetic field generation, including the initiation of dynamo waves and reversing polarity. The second was the influence of large-scale thermal heterogeneity at the core-mantle boundary on the small-scale convection structure of core flows.

Since March 2002, he has been employed as a research scientist at NORSAR working on various projects within the fields of signal processing, array seismology, and their application to the monitoring of underground nuclear explosions. Areas of special interest are signal detection and parameter estimation using seismic arrays, detection of weak seismic signals using waveform correlation methods, the application of spectral methods for the detection and characterization of seismic signals, and joint seismic and infrasonic processing.

Of particular interest are methods for signal identification and parameter estimation in situations in which classical array processing methods fail. This has included beamforming procedures using continuous spectral estimates over large aperture arrays and small networks, and empirical matched field processing where phase and amplitude relations of incoming signals are compared with those from previously observed waveforms.