06:31Science Cafe09/06/2015BBC Radio Wales Duration: 30 minutes Sun 14th Jun 2015, 06:31 on BBC Radio Wales ExtraAdam Walton explores why earthquakes happen and how seismic data is recorded.GenresFactualScience & NatureFactualScience & NatureScience & TechnologyFormatsMagazines & ReviewsBrandScience Cafe Source: BBC Online