The data at the base of the work

Task manager: O. Cavalié
Participants: O. Cavalié, A. Avallone, M. Vergnolle, M. Marchandon, J.M. Nocquet, L. de Barros, J. Hollingsworth.

In Work Package 1 resides the base of our work: the use of multiple and complementary observations. Seismological and geodetic data will be used to document both co- and postseismic phases. We will perform the methodological developments required to address the questions posed, in particular concerning the early postseismic phase.. GPS data offer coverage for all the time scales of interest (high frequency, sub-daily and daily times series). InSAR observations of coseismic and postseismic deformation will greatly complement the GPS data as they produce both spatially dense images of the surface deformation and position time series. Finally, the relatively new and little-used optical image correlation technique will greatly complement the coseismic InSAR observations, especially close to the ruptured fault where InSAR observations typically decorrelate.

Our objective is to obtain on a few past major earthquakes and future events:

• Precise documentation of the early postseismic deformation phase and, if possible, transient seismological signals after the earthquake.
• High rate, sub-daily, daily, and irregular position time series imaging the co- to early postseismic deformation.
• Dense average co- and postseismic deformation maps focusing on near fault areas.