The seismology of Lionel Messi

When Lionel Messi scores another wonder strike, the city of Barcelona literally shakes. Scientists have a seismometer installed close to the Camp Nou stadium and it picks up the telltale vibrations every time the crowd celebrates a goal. There is a clear spike in the data as fans jump up and down. Jordi Díaz from the Institute of Earth Sciences Jaume Almera spoke with our science correspondent Jonathan Amos.