Why was the Turkey-Syria earthquake so bad?

The WHO have described last week's Turkey-Syria earthquake as one of Europe's worst natural disasters in the last 100 years. David Aaronovitch finds out why it was so deadly.Joining David Aaronovitch in The Briefing Room are:Stephen Hicks, Seismologist at University College London Professor Dina D’Ayala, Co-Director of the Earthquake and People Interaction Centre at UCL, and UNESCO Chair on Disaster Risk Reduction and Resilience Engineering. Firdevs Robinson, London-based journalist, broadcaster and commentator specializing on Turkey, the Middle East, Caucasus and Freedom of the Media. Dr Lina Khatib, Director of the Middle East and North Africa programme at Chatham HouseProducers: Kirsteen Knight, Dan Gordon and Ben Carter Production Coordinators: Janet Staples and Siobhan Reed Sound mix: Rod Farquhar Editors: Richard Vadon and Charlotte McDonald