Superconduting gravimeter at Svalbard observes M9.0 earthquake

Friday 11 March 2011 at 0546UT a big M9.0 earthquake happened approximately 200 km outside Sendai, Japan.
The earthquake was observed with a Superconducting gravimeter located in Ny-Ålesund, Svalbard approximately 10 minutes later.
This figure shows what the superconducting gravimeter observed.