2014 Napa quake's 'creeps' lingered for 4 weeks
Research at MIT has revealed that the magnitude 6.0 earthquake which hit Napa in the US state of California in 2014, continued to 'creep' for at least four weeks after the main event. The post-quake 'afterslip' caused certain sections of the main fault-area to shift by as much as 40 centimetres in the month following the main earthquake.