Conference proceedings ; Online: What have we learned about the earthquake deformation cycle from advances in geodetic monitoring?
XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
2023
Abstract: Over the last 20 years, measuring Earth’s deformation with satellite geodesy has developed from a niche research activity into a robust and reliable operational suite of monitoring tools. We now have thousands of continuously recording GNSS stations and ... ...
| Abstract | Over the last 20 years, measuring Earth’s deformation with satellite geodesy has developed from a niche research activity into a robust and reliable operational suite of monitoring tools. We now have thousands of continuously recording GNSS stations and a suite of satellites acquiring data suitable for routine InSAR analysis. In this presentation, I will review what we have learned from these data sets about the earthquake deformation cycle and discuss the areas where further research is needed. Before satellite geodesy, coseismic deformation had been measured for just a handful of earthquakes. We have now mapped the deformation fields from hundreds of events, and InSAR, in particular, has been particularly powerful, revealing a diverse array of behaviour in the brittle crust. Following earthquakes, we have now built up long time series of post-seismic observations for many events. The combination of spatial and temporal information that satellite geodesy provides is being used to disentangle the mechanisms responsible for postseismic stress adjustments, in turn giving us unique insights into the rheology of the crust and mantle. Once initial rapid postseismic transients have decayed, long-term geodetic observations from InSAR and GNSS are now mapping strain accumulation patterns over vast regions, and these are beginning to be used to help better inform seismic hazard models. We are also increasingly seeing a variety of transient behaviours that don’t fit into the classic co- post- inter-seismic framework. I will end the presentation by discussing these and the potential for new discoveries over the coming decade. |
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| Subject code | 550 |
| Language | English |
| Publishing country | de |
| Document type | Conference proceedings ; Online |
| Database | BASE - Bielefeld Academic Search Engine (life sciences selection) |
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