Geohazards

The goal of this work is to use global satellite measurements of the Earth's surface and volcanic gas emissions to advance knowledge of processes responsible for earthquakes, tsunamis and volcanoes, and to develop better warning systems. Current work includes:

• InSAR studies of 4 recent normal faulting earthquakes in Tibet and the 2008 Sichuan earthquake.
• Derivation of the detailed velocity field for western Anatolia from combined CGPS and survey GPS data and analysis of deformation models.
• Development of techniques to mitigate atmospheric errors in SAR interferograms by retrieving water vapour fields using the Unified Model.
• Retrieval algorithm for volcanic plume properties using SEVIRI measurements; ash plume altitude from stereo imagery (SEVIRI-MSG/Meteosat5).
• Development of SO₂ retrieval algorithms for IASI/GOME.

Radar interferometry (InSAR) provides detailed maps of the warping of the Earth's surface during the earthquake cycle with a precision of a few millimetres. The technique is being used to locate faults and develop earthquake warning systems.	Montserrat 2008