By Jonathan Amos BBC Science Correspondent 12 May 2015 Nepal quake Video Nepal quake causes landslide Video Nepali parliament hit by quake US helicopter missing in Nepal Second Nepal earthquake strikes By any stretch, a magnitude-7.3 quake is a big one. Tuesday's shaker in Nepal is not quite as bad as the 7.8 tremor on 25 April - which was 5.5-times as energetic - but it is a major quake nonetheless. The location is different. The epicentre this time is about 80km east-northeast of Kathmandu, halfway to Everest. A fortnight ago, the event began 80km to the northwest of the capital. But just that observation is instructive because of what we have learnt in the past two weeks. In April, we saw the fault system rupture eastwards from the epicentre for 150km. And the immediate analysis suggests Tuesday's tremor has occurred right at the eastern edge of this failure.