the centre of the city to its much larger current site in the suburb of Ilam. 1973 saw the university celebrate its centenary, during which the neo-gothic buildings of the old campus were gifted to the City of Christchurch, which became the site of the Christchurch Arts Centre, a hub for arts, crafts and entertainment in Christchurch. 1974 also marked the opening of the James Hight Library, which at the time, was New Zealand's largest university building. Ilam's three university halls of residence were renamed University Hall in 1974, and the student dormitory was used as the Athletes Village dormitory for the 1974 British Commonwealth Games hosted in Christchurch. In 2004, the university underwent restructuring into four Colleges and a School of Law, administering a number of schools and departments (though a number of departments have involvement in cross-teaching in numerous academic faculties). For many years the university worked closely with the Christchurch College of Education, leading to a full merger in 2007, establishing a fifth College. Post-earthquakes, 2010–present On 4 September 2010 at 4:35 am local time an earthquake struck the South Island of New Zealand with a moment magnitude of 7.1 several aftershocks followed the main event, the strongest of which was a magnitude 6.3 shock known as the Christchurch earthquake that occurred nearly six months later on 22 February 2011. Although there was no serious injuries to staff or students on campus and only minor damage to buildings, the initial quake closed the university for a week, and the library was shut for months while shelves were repaired and half a million books placed back on shelves. The Student Volunteer Army was a group of around 10,000 university students and others who worked over a period of months to help clean up liquefaction. In the months following the earthquake, the university lost 25 per cent of its first-year students and 8 per cent of continuing students. The number of international students, who pay much higher fees and were a major source of revenue, dropped by 30 per cent. In October 2011, staff were encouraged to take voluntary redundancies. As well in September 2011, plans were announced to demolish some University buildings that were damaged from an earthquake. By 2013, the university had lost 22 per cent of its students. However, a record number of 886 PhD students were enrolled at the University of Canterbury as of 2013.