Widespread horizontal ground deformation is a result of large 'Peak Ground Accelerations' (PGA's). A PGA is equal to the largest shift between plates in any given earthquake, and is usually larger than a vertical shift, creating more damage. Widespread horizontal ground deformation was a contributing factor in the 1975 Earthquake in Kilauea Volcano, Hawaii, resulting in an extreme 8-metre shift horizontally and 3.5 metres vertically. The scientific connection between the Kilauea Volcanic Earthquake and the Olancha Earthquake sequence stems from movements many kilometres away from the epicentre - where the earthquake is initiated. In Hawaii the magnitude 7.2 earthquake was felt approximately 30 km away west from the epicentre, down the south coast, due to the major 8-metre ground shift taking place.