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Durham University

Institute of Hazard, Risk and Resilience

All Future Events

IHRR Seminar: Dr Jonathan Weiss, University of Leeds

19th November 2018, 13:00 to 14:00, W309, Geography

A tale of two adventures in geodesy: Mapping intracontinental strain in the Alpine-Himalayan Belt with InSAR and unravelling postseismic deformation following the 2010 Mw 8.8 Maule earthquake with GPS

In this seminar I will highlight two lines of research that share the common goal of achieving a better understanding of the earthquake cycle using satellite-based geodetic data. These data are critical for measuring the accumulation of elastic strain across active geologic structures, assessing the seismic hazard associated with the eventual release of this strain, and placing constraints on the stress evolution and rheology of the Earth. Recent improvements in Interferometric Synthetic Aperture Radar (InSAR) enable routine measurement of surface deformation over spatial scales appropriate for studying regional fault systems, the growth of mountain ranges, and motions across entire tectonic plate boundary-zones. The Centre for the Observation and Modelling of Earthquakes, Volcanoes, and Tectonics (COMET) is developing automated algorithms for the mapping of surface velocity and strain rate fields at high spatial and temporal resolutions using InSAR and GNSS/GPS data in order to detect interseismic deformation across faults with slip rates on the order of a few mm’s per year. In the first portion of this talk I will present some of our recent progress using examples from the Alpine-Himalayan belt and I will discuss challenges associated with working at the plate tectonic scale. In the second portion of this talk I will show how we are using GPS observations following the 2010 Mw 8.8 Maule earthquakes in Chile to provide insight into megathrust fault frictional properties, crust and mantle rheology, and the evolution of stress during the subduction zone seismic cycle.

These seminars are free to attend and open to all.

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