Tens of thousands are feared dead after the Bhuj earthquake in the Indian state of Gujarat. Horrifyingly, seismologists think that for India the worst in probably yet to come. Roger Bilham, a geologist at the University of Colorado at Boulder, believes that more than 60% of the Himalayan region to the north of the country is overdue for an earthquake of magnitude of 8 or more. Such a quake would release an amount of energy equivalent to a nuclear explosion of more than 150 megatonnes.