At 02 hr 55 min 21 sec UTC on 28 May 1989 a Richter ML 5.6 earthquake occurred in Central Australia in crystalline basement beneath the southern margin of the Amadeus Basin near Mt Olga and Uluru (Ayers Rock) in the Northern Territory. It had a well-constrained focal depth of 31 km, which explains why no surface faulting was discovered. It is the deepest earthquake known to have occurred in Australia prior to 1992, the largest to have been recorded in the region, and had no observed foreshocks or aftershocks. The earthquake was felt over a radius of 220 km and caused minor damage at Yulara. The fault plane solution indicates almost pure thrust faulting with a pressure axis striking N 64° E.