The 2017 Botswana "intraplate earthquake" constrained by Sentinel-1 InSAR data.

Polcari M., Albano M., Bignami C., Stramondo S.
  Giovedì 14/09   16:00 - 19:00   Aula A210   IV - Geofisica e fisica dell'ambiente
We applied InSAR analysis to constrain the April 3rd, 2017, Mw 6.5 earthquake occurred in the Central District of Botswana. The seismic event was also felt in neighbouring Zimbabwe, South Africa and Swaziland and it is classified as "intraplate earthquake" since this area is far from any plate boundary, which are the seismically active regions of the planet. The study was conducted by a pair of Sentinel-1 SLC data revealing a Line-of-Sight (LoS) co-seismic deformation of about 5 cm. The preliminary data modelling allowed identifying a deep dislocation source, located at approximately 15--20 km at depth, with a strike of $331^{\circ}$ and a dip of $78^{\circ}$, thus ruling out any possible connection with anthropogenic activities.