CE49 - Planétologie, structure et histoire de la Terre

Identifying slow slip dynamics combining seismic and geodetic data – SSDYN

Submission summary

Slow slip transients occur in various parts of the world and more particularly in subduction zones, where they play a major role in the seismic cycle by releasing part of the strain accumulated during the interseismic period, but also because of their interactions with large, potentially damaging earthquakes. The main objective of this project is to gain knowledge about slow slip processes by capturing slow slip dynamics on a large spectrum of spatial and temporal scales. These slow transients are measured by geodetic surface observations, typically GNSS, or InSAR with limited resolution due to the data noise. The seismic signature of slow slip (tectonic tremors, low frequency earthquakes) brings additional constraints on the temporal evolution and location of slow slip. In this project, we will propose original methods to increase our ability to detect new signals in seismic and geodetic datasets and to combine them to study slow slip dynamics. Our study focusses on the Mexican subduction zone, an ideal natural laboratory thanks to the diversity of the processes recorded there. In an unprecedented large-scale analysis from Jalisco to Chiapas, we will use automatic tremor detection methods, network analysis of GNSS data, combined with InSAR, to build a catalog of slow slip and tremor which will be exploited to constrain the SSE scaling laws, plate coupling and its variation, and the connections between slow deformation, tremors and regular earthquakes. A local study targeting the densely instrumented Oaxaca region, where we plan to install additional seismic stations, will allow a more detailed characterization of these connections, detection of events of lower amplitude and focus on the short time scales dynamics of slow slip.

Project coordination

Mathilde Radiguet (Institut des Sciences de la Terre)

The author of this summary is the project coordinator, who is responsible for the content of this summary. The ANR declines any responsibility as for its contents.

Partner

ISTERRE Institut des Sciences de la Terre

Help of the ANR 278,899 euros
Beginning and duration of the scientific project: April 2022 - 48 Months

Useful links

Explorez notre base de projets financés

 

 

ANR makes available its datasets on funded projects, click here to find more.

Sign up for the latest news:
Subscribe to our newsletter